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ISSN 1346-7565 Acra Phytotax. Gcobot, 60 (1): 47-S5 (2009)

Systematic Studiesof Bornean VI. Three New Species of

Boesenbergia (Zingiberaceae)

SHOKOSAKAIi" AND HIDETosHI NAGAMAsu2

'Research 1<),oto603-804Z ,lapan. InstituteforIIumaniiy and ,Vbture, ,n4otqyama 4)-Z4, lkrdmigamq 2111ie *[email protected],ip (tiuthor,for correspondenccl; 1<),oto U}iiverslt.v Mits'eum, I{)]oto Liniver,siO', Scidyo, K),olo 606-8501, ,JLupan

Th ree ncw species ofthe genus Boesenbe":gia (Zjngiberaceac) from Borneo, B. imbakensis, B. taeviva.cri- nata and B. subulata are descrlbed. A reviscd key to the Bornean species of Boesenbengia is also pro- vided,

Keywords: Bernco, Boesenbergia irnbakensi,sc, Boesenbergia laevb,aginata, Boesenheffgia subulata,

Boesenhengia Kuntze is one of the largcst 1. Boesenbergia imbakensis S, Sakai & Na- genera in the Zingibcraceae, eurrently including gam,, sp. noy. (Figs. 1, 2) about 80 species. Since Sm{th's review of Boe- HaccspeciesB.but'itianaecaulibusmultifotiatisantherae

species, senbergia inBorneo (1987)including 19 thecae rimis dchiscentibus simi]is, sed laminis polis lan- ten species have been described by Poulsen ccoEutis quam linearibus et foliis nen fiabcllatis dispositis dit]fert. (1993), Cowley (1998, 2000) and Sakai & Na- fypus. . Sabah, from Camp E (Imbak gamasu (2006b). Important characteristics to dis- Scicntific Expedition Base Carnp> upstream, Imbak Can- tinguish species include the arrangement of fiow- yon, Kinabatangan, ca. 160m alL., lowland tropical fbrest, ers on infioresccnces (Sakai & Nagamasu 2006al 05006.829'N, 116057.6e5'E, petals whitc, staminode white, and anther dchiscence patterns (Valeton 1918, labellum white with yello-, centraL line and a red blotch at the base, Nlri.aamasu Z235 KYO; iso- SAN). Smith 1987). By contrast to species in the sea- (holo- sonal tropics ofIndochina which have distichous Herbaceous plant up to 30 cm tall, fertile infiorescences and anthers dehiscing by slits, the shoot ca. 4-leaved; bladeless shcaths O-2, papery, majority ofBorncan species haye infiorescences much shorter than sheaths with lamina; leaf of flowers arrangcd in one-sided spirals, and half sheaths papery, glabrous, margin membranous;

of tbe one-sided spiral species have anthers de- lamina 11-16 by 3-4 cm, lanceolate to oblancco- hiscing by pores (Sakai & Nagamasu 2006aj. late, plain green, glabrous on both surfaces; apex Thesc charactcristics arc often difficult to eb- slightly acuminate; petiole 4-7.5 cm, glabrous; serve in dry materials, however, since thc infio- ligule membranous, glabrous, ca, 1 cm long, en-

rescences are usually concealed in leaf sheaths tire, triangular, I4]7oFescence terminal, with 4i7

and bracts, and the flowcrs are rclatively small fiowers arranged in one-sided spiral; outermost

and fragile. sterilc bract 4-6 by ca, 1,3 cm, coriaceous, ob- A recent increase of good hcrbarium materi- long, glabrous on both surfaees, apcx acuminate;

als make the description ofnew species and study fertile bract ca. 26 by 4 mm, linear-lanceolate, ofpoorly known specics possible. In this paper, metnbraneus, glabrous on both surfaces; bracte- we dcscribe three new species, alld provide a re- ole ca. 22 by 5 mm, lanceolate, glabrous on both vised key to Bornean Boesenbergia. surfaces, membranous, apex shallowly 2-lobed,

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A

2cm

zi/z 121i.i.-

/･ 7

1cm B

'Ii'P･ 1cm m

c D E

FIG.1. Boesenbergia imbakensis S, Sakai & Nagarn. flL: habit. B: anthcrand st{gma. C: calyx. D/ epigynous glands and ovary. E: fertilc bract. F/ bracteole, G: infiorescenee and flo",er (A: from dry rnateria] of .lybugatnasu Z235. B-G: from spirit ma-

tcrial oLlhgamasu 7235).

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Fl{;. 2.Habit ofBoesenbeigia iinbakensis S. Sakai & Nagarn. (IVagamasu Z235).

Ftoweng berne singly, ca. 7 cm long, white; calyx Nbte. Vegetatively, this species is gimilar to ca, 7 mm long, tubular, membranous, glabrous on Boesenbergiapcrrva (Ridl.) Merr. in the several- both surfaces, apex unequally and shallowly 3- leaved shoot, and lanceolate, relatively small lobed, ciliate; corolla tube ca. 4 cm long, almost lamina with distinctive petiole. However, it is a glabrous outside, glabrous inside except for hairs more giabrous plant with anthers dehiscing by on uppermost part; corolla lobes membranous, slits and may not be closely allied to B. parva. oblong, glabrous; dorsal lobe ca. 17 by 6 mm, lat- erals ca. 15 by 4 mm; lateral staminodes ca. 14 by 2. Boesenbergia laevivaginata S. Sakai & Na- 4 mm, elliptic, glabrous on both surfaces; label- gam,, sp. nov. (Fig. 3) lum ca. 18 by 14 mm, oblong, white with yellow IIaec species B. stenoph.],llae R. M. Sm. cauhbus multifo- on the centre and Ted at the throat, glabrous; sta- liolatis tbli{s angustis longipetiolatis basi uneaqualibus rnen ca. 12 mm long, filament ca. 6 mm long, antherae thecae poris dehiscentibus valde similis, scd la- shortly on the dorsal surface, pubescent glabrous belle minore ca. 1.3 cm longo (ca. 2.5 cm Iongo in B sten- the on ventral; anther ca. 5 mm long, thecae open- opIrylla) et vaginae foliorum laevibus striatis in foliis su- ing by slits, glabrous; anther crest ca. 1 mm, gla- prcmis conspicue latae factae ditliert, 7)pus. MALAYSIA, Sarawak, 4th Div,, Marudi Dist., brous, entire or slightly obtuse; ovary ca. 4 mm Bario, top ofridge near Batu Buli, 4500-8000 fi., shaded high, unilocular with ca, 6 ovules, glabrous; epig- under old closed lbrest, sandstonc soils, Lamh AL SAR ynous gland ca, 7 mm, in two parts, linear. Cop- 231!85 (holo- E). sules unknewn.

Erect herb ca. 20-50 cm tall, fertile shoot 4--9 ]eaved; Oiher specimen examined. MALAYSIA. Subah. bladelss shcaths usually absent; lamina 11-17 by Frem Camp E (Imbak Scientific Expedition Base Camp) upstream, Imbak Canyen, Kinabatangan, ca. I60 m alt., 2-4 cm, papery, elliptic to oblanceolate, gl abrous lowland tropical forest,05006,829 'N, 1 ]6057.605'E, pctals except around thc midrib on the lower surface, white, staminode white, Labcllum white with yellow cen- dull green on the upper surface, sometimes paler tral line and a red blotch at the basc, Nagamasu re32 (KYO). along midrib, reddish brown on the lower in the dried condition, upper surface dar]c green, lower

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m

cm

FIG. 3. Boesenbergia laevivaginala S. Sakai & Nagam. A.: habit. B: anthcr and stigma. C: flower. DT bract. Ei bractcole. (.A, B: from dry material ofLambAL SAR 23f785. C: composite from dry rnateriats ofLamb A[ S:4R 231rs5 and Aninfuh Surat SAAI f43428. D, E: from dry material ofArgent 251085IO),

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name:jcrangau merah, "i Pztan ihi- surface of (new) leaves reddish or purplish when C7iingS56238(SAR); dem, Apad Keruma, submontane mossy forest, 1450 m a. alive (according to the notes on some specimens s.1., tcrrcstrial ginger, 30-40 cm tall, leaves reddish to cited below), apex acute, ciliatc, basc uncqually whitish on lower surfaces, fiewers white, Vii Puan Ching cuneate; 5-13 cm long, sheath petiole glabrous; S55914 (SAR;}; ibidem, stcrile collection, name in Malay: 6-12 cm long, papery, striate and shiny, yellow- jerango mcrah, PVbng S30449

brous on both surfaees; labellum ca. 13 by 10 jerangau merah, Logie et al. SS6548 (SAR); away firom LongRaya te Sg. Adang, 1100m a,s.]., herb in large clus- mm, oblanceolate, white with yel]ow line on the ter, 20 cm tall, stem green to reddish, pctieLc, ieaves centre; lateral staminodes 8 by 3 mm; stamen 5 green, peduncles, sepal, petals wh ite, 1ips yellopv, ,httaihi mm, anther ca. 3.5 mm, thecae dehisc- glabrous; et at. S77260 (SAR). Sabah. Sipitang Dist.: Lewcr Sg, ing by pores; anther crest ca. 1 mm, entire; stig- Maga. I200 f't a.s.l. Iowermontane oaktchestnut forest & ma cup shaped, dorsal opening ciliate; ovary ca, rjverine forest, herb, fiowers white with pale yellow, Anin- y'zth Surat su N143428 (K); Long Pa Sia, ca. 5026'N 1S5a44'E, 4 mm high, glabrous; epigynous gland unknown, in shade ofsubmonLane forest, 1000 m a.sJ., plant to 30 ,F?uitunknown. em, leaves glossy dark green above, purplish beneath, in- eorescenec not rcally cmcrging from the lcaf shcath$, Other ,specimens examined. MALAYSIA. Sarawak. Belaga Dist,: Batang Balui, Batu Laga Plateau, ULu Sg. flo"'ers white with trans]ucent lines, G. Argent 25i08510 Ulu Elyak, terrestrial ginger, 20-30 cm tall, petioles green, (E); Padas, ca. 3 km E ofLong Pasia, ridge, open for- est, terrestria] herb to O,5 m, often dominating in clumps, reddish at the leaf buse, leaycs green ubove, reddish on ]amina durk shiny, 20 cm, bracts the lower surface, fiewers terminal, white, yellow at the grccn pctiolutc purplc, fiowcrs white with central bifid bar, yernacu]ar lip, vernacular name: jerangau merah, 7ii I'uan Ching yellow, -Tatau name in Lundaych: kcri D, Poulsen1792 S56724 (E. SAR). Dist.: Tatau, Vicinity ofMinah buro,A. (E). Camp Ctimber camp efI..L.B.T.C.), along Sg. Kakus, 50- --Marudi 80 m a.s.1., M. Hotta I5816 (KYO). DisT.: IVotes, When Smith (1987: 230) describedBoe- Kelabit Highlands, stunted primary fbrest behind Ramu- senbergia stenopltyUa R,M. Sm., she recognized du, dominating herb on opell forest floor, rhizomes and two specimens from Bario district in Sarawak buds undcrsidc of nc-i leaves red- yellow/beigc-orangc, "closely that approach B. stenopbylla but differ in dish, rhizome with aromatic smell, x,ernaeular name in the shining striate ]eaf sheaths and Malay: jeringau merah, H. Christensen 250 (K); ibidem, (prebably) 'ft)rest, Pa Dali, secondary 1 lOO in a.s.1., terrestrial ginger more numereusly fiowered inflorescence." Wc

on littcr soiL 25-35 cm tall, runners reddish, bracts green- have tbund additional specimens of the taxon, ish red, fiowcrs whitc, }7i Puan Ching S5(i240 (SAR); ibi- which share distinctive characteristics such as a dem, Apad Runan, Pa Di-it water fa11, submontanc forcst, reddish brown colour on the lower surfaces ofthe 1550 m a.s.1., sterile collection, terrestria] gingers, 20-30 shining striate sheath cm tal1, rhizome reddish above thc littcrs. petioles reddish leaves,longpetioles, leaf to dark green toward leaFblades, leavcs grccn above, and elliptic shapc of lamina, from Bario and oth- whitish to red on the lower surfaces, vernacular pale er regiens. The structure of the inflorescence

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'i'ljN ･}gil i 'Z',i

xrw 7 7bl..

"･' .･--z /-･;.,.-/- 7 B 12mm

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1cm A D E F

Fl(J. 4. Boesenbergia subutata S, Sakai & Nagam. A: habit, mature shoot beaTing a young shoot at the axil ofa leafon the left (arrow}, B: anLher. C: labellum and lutcral corolla lobcs. D: calyx. E: bracteole. F: bract. (A, B, C: from dry materiat of Kirkttp D. }V SIen, D, E, E: from dry material of:t4. ffbtta 12350).

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which is completely concealed in the leaf sheaths ca. 31 by 3.5 mm, membranous, linear-oblanceo- could not be examined, but probably ofa one-sid- late, totally glabrous; bracteole ca. i5 mm long, ed spiral as in many other Boesenbeigia species membranous, open tQ the base, 2-toothed, tetally from Borneo, as thc infiorescence has numerous glabrous. Flowens white, calyx ca, 6 mm long, flowers congested on a very short rachis, The membranous, tubular, 2-toothed, glabrous; cerol- conspicuously thickened innermost leaf shcaths la tube glabrous; corol1a lobes membranous, ca, 8 may contain water or mucilagc to protect the in- mm long, glabrous on both surfaces; labellum ca, florescence. 10 mm long, obovate, glabrous except for long The holotype ofBoesenbergia stenopbyUa at hairs at the throat of thc corolla tube, white with E, wh ich were originally collected at Long Pasia, some yellow on the centre, possibly seme orange- consists of a spirit collection only (M. Newman, red colour at the very base; iateral staminodes ca. persona] cornmunication). However, the draw- 8 mm long, oblong to obovate, glabrous; stamen ings ofdissectcd fiowcrs ofB. sten(rpdytta in Sm ith ca. 5 mm long, anther ca, 2.5 mm, thecae dehisc- (1987) are based on the typc material, Argent ing by pores, anther crest ca, 1.5 mm, shallowly 1 8185 (E) and they are dififerent from the new tax- 3-lobed; fitament ca. 1 mm, with long hairs at thc

on in thcir largcr anther crest and longer filament, base and some very short hairs on near base of

characteristics also observed in Burtt c{2 vabods the thecae on the filament; stigma cup-shaped B2.I07 (E) cited as B, stenophylta by Smith (1987).with apical-opcning, with sparsely hairy around Thc two species may occur sympatrically. the opening; ovary ca. 2 mm long, glabrous; epig- Boesenhengia laevivaginata seems to occur ynous glands unknown. dapsutes unknown. forests in high altitudes, although there is a spec-

Other ,specimens examined. BI{UNEI. Temburong. imen from Sg. Kakus, 50-gO m a.s.1. (M Hbtta 15816), Aino, Ulu Belalong: herbaceous ca, 30 cm tal1, leaves al- ternate, sheath winged halfiway the pctiole, fiower soli- tary, terminal, whitish including pedicel, lower petals 3. Boesenbergia subulata S. Sakai & Nagam., large with yelLowish tinge jn the middle. BRUIV15897(K); sp. nov. (Fig. 4) small herb 1O cm high, flower with long tube sheathed by thc leufstalks, coroLla white apart from yellow labellum, Haee species B. olig. ospermae (K. Schum.) R. M. Sm. orange-red atthcvcrybasc,Kirkup D. PF[ 85P (K). Belait. Iaminis miiioribus lanccolatis plus minusvc glabris ct an- Seria, Teraja forest reserx,e, en reute from Kpg. Menda- therae thecae poris dehiscentibus valde siinilis, sed flori- ram to Bt. Teraja, 100-2SO rn a.s,1., M Hbtta 12693 bus albis minoribusque et antherae pilis glanduliferibus (KYO); Bukit Puan, in primary forest near government absentibus di/Cfert. saw-rnill, M, Hotta 12350 (KYe). 7))pus. BRUNEI. Belait, Labi, herb, fiowers erect, MALAYSIA. Sara"'ak. 4th Diy.: Mulu, Along Sun- long-tubular, originating from u,ithin rcddish leafshcaths gai Melinau-paku, foot of Gunung Mulu, alt, 50-100 m, with warts, -'hite with translucent ycllow-brown pctals M. Hotta 15224 (KYO). veins and yellow labellutn, Kirkup D. M 8f8A (holo- K). Note. Vegetatively, this spccies is character-

Erect herb ca. 20 cm tall, 2-8 leaved; bladeless ized by relatively thick leaf sheaths and ligules

sheaths O-2, probably lost in older shoots; lower bilobed to the base. The characters are probably leaves occasionally have young shoots in axils; lackinginBoesenbergiaogigosperma(K.Schum.) lamina (6-)7-13(--15) by 1,3-2,8 cm, papcry, lan- R. M. Sm., which may be most ciosely related to c ¢ olate, glabrous or slightly hairy on both surfac- the new species. The other interesting character- es; apex acute, base cuneate to slightly attcnuate; istic is the production of new shoots in the axil of petiole 7-25 mm long, glabrous; sheath (3-)4-5.5fertile leaves, It has rarely beeii observed in other cm long, papery, striate, glabrous or rarely hairy Boesenbergia, The distribution of the species is on the margin, otherwige glabrous, margin mem- limited to Brunei except fbr one specimen from branous; ligule 4--13 mm long, papcry, 2-lobed, Gunung Mulu, Sarawak, triangular, glabrous. Injlorescence terminal, with ca,7 fiowers arranged in a onc-sided spiral; bract

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Revised Key to Bornean Boesenbei:gia (modificd from Sakai & Nagamasu, 2006b)

ta. CTeeping heTbs; shoots normally single-leaved; inflorescence more or ]ess sessile; anther dehiscing by slits."...... "...... "....,,..."...... ,...."...... ,.."...... -....."...... "...... -...... -..2

b. Erect herbs; shoots with one to many leaves; infiorescence sessilc or long pedunculate; anther dehiscing byslitsorpores...... ,-..,,.....m.,.,.."-...... ",...,...",,.-.H",.,.,H",H..H...,,..,...... "..H,H-,,.""....uu".,"...... ,,,...6 2a. Leavcs more or lcss circular, ebtuse or obscurely ernarginatc at apex ,,,,,..,.,,...... , B. orbieulata R. M. Sm.

b. Leaves elliptic or lanueolate, acute at apex ."....H,,.-..,,."-,,...".,,,.,-...... "...-..-..,...... ,..,...-.H..-,.,... 3 3a.Leavcsplaingrecn",,.,...."...,...,....,,...."..,.H..".,.,,.,-m.,,.."..,H..m.,....,,...... ,.."..H..-..-"""..-.,..."...... ,.,H4 b.Leavesvariegated...... -....,..,-",H,..H"...... "..,,...... ,.."...,..,."....,,"...... ,.".H..,"..,....,.,.....,...m....,,.,..-,.,,."h5 4a. Corolla tube pubescent outside; fiowers not red at throat; labellum entire ...... B..f7tivoalba R. M. Sm. b. Corolla tube glabrous outsjde: fiowers red at throat; Eabe] lum bi]obed ...... ,,...... B. fiavoruhra R, M. Sm. 5a. Petioles to O.5 cm; lamina 4-8 by L.S-2 cm, mid green with abroad silveT band on either side ofthc midrib above ..,...,""..,,.,..".....,...... ,...... -,...... -..,,,..,-..,,...-..,.,...-..,...,,,...... ,,,."...,,.v.,.,...".. B, kerbj,iR. M. Sm. b. Petioles 2-3 cm; Lamina 7-12 by 2.5--7 cm, dark green with a band of lighter green up the midrib, variega- tion sometimes extending to the main latcral veins ..,.,...... ,...... ,...... ,,.... B. vcxriegata R. M. Sm.

6a. Fcrtile shoets singlc-leaved, rareLy bladeless or 2- or 3-leaved .....,,,.....,,,,,...... ,,,,"...H,."..,...,....-,,,,.."..,,,.. 7

b. Fertile shoots with t-,o or more leaves ...... ,,..,-...,.,,..,..,..,...... "",,...."",....",,.."...,,..-,...... ,..-,,,,.,"..,.... I!

7a. Lamina 50 by 12 cm er larger ..,,...... ,,..."..,,,.,"H.,,...H,..,...-..,...... ,... B. grandijbtia (Valeton) Merr. b. Lamina much smaller, not exceeding 30 cm long ...... "...... "...H..-...,.."...... "...... "..,,.."...... "..... g

8a. Laniina dceply cordate at thc basc ..,...,,...-...... "".....".H...... -..,...-...,,..,..H B. cordata R. M. Sm

b. Base ofthe lamina more or ]ess attenuate not cordate .,.."...,...... ,,...... ,..."..,.."m,..,,,...... ,..",H...... 9

9a, Peliole 17-34 cm long ...... ,...... ,....,....H..,.....-..,,...-,..,,...-...... -...,...H,...... -..,...-.. B. b"uneiana Cowley

b. Petio]enot exceeding 17 cm .,-H.,,..,--,,...",...,,..-...,,..,.....-"...... ,,,,...... ,..H",,..."...,.....,.."..,.."m,...... 10 10a. Lamina 7 12 cm wide; petio]e robust ca. 5 mm thick; lamina with appressed hairs especial]y around mid- rib belew ...... ,....H-...... ",...... "...... h...... "...... - B. Iamhirensis S. Sakai&Nagam, b. Lamina less than 7 cm wide; peLiole slcnder, 2 mm er less thick; leaves glabrous ".,...... "-.,...H"...... ,...... ,...."-,,,..."...,...."..,,,...... ,,,.,....". B, ischnosiphon S. Sakai&Nagam. 1la. Outermost bract forming a bucket or vase-like structure enclosing inflorcscencc sometimes tegethcr wjth sheaths ofupper leaves; lamina large, much longer than 30 cin ...... "...,.."...,.,."...... ,....-...,,,"..,..,,... 12 b. Leafbase or sbeaths not thickened as above, or if thickened, leaves are much shorter ...,,,....,...... ,,. 14

12a. Petiole 42-50 cm long ."...H..""..,,,..-...... "...... ,...... ,,H",.,..."..,,...-...... , B. J'angarunii Cowley b. Leafbasc long-attenuate forming a winged petiolc less than 25 cm leng ,...-,,.."..,,...,,..."....,.H.,,,..-..,.. 13 I3a. Infiorescence densely pubescent; anther ca. 3 mm long, dehiscing by subapical peres .",,,.H...,,,..H"....,...... ,.,,.",.,,.,,"."..,,.."....,,..."...,....-,.,,,..-.....-"...... "".B.hosensisCowley b, Plant almost glabrous; anther ca. 10 mm long, dehiscing for ca. 6 mm !eng (probably dehiscing by slits) ...... ,...,...... ,.,..""..,-,...... ,,..."...... -...... ,,...... -,.,...... ,..H....,..."..,...".,,,...,...,..B.armeniaeaCewley 14a. Leavcs iarger rhan 20 by 7 cm; anthers dehiscing by pores ,.,...... ,..,....,..Hm,,.,...... ,..H...,...H...... ,..".,,. L5 b. Leaves shertcr tltan 20 cm, if Ienger narrewcr than 7 cm; anihers dehiscing by slits or pores ,...... ,..,. 16 15a. Leafsheath sparsely hairy or glabrous; bracts 5-8 cm; corol]a tube 8-10 cm; ovary glabrous .-....,,...... ,,...""..H....",..,.,..-.,,.,..."...... -...... H-..."...... -,,,...... ,..-,,., B. grandis R. M. Sm. b. Leaf shcath densely hairy ; bracts 2-3.5 cm long; corotta tube ca. 5.5 cm long; ovaTy densely hairy in upper half .,....."m.,,..H"....,...-..,.....,...... ,,....-...... "...... "...... B. lysichitoides S. Sakai & Nagain. 16a. Infiorcscence jong exsertcd from the leaf sheuths when fuIly grown, spindle-shaped; flowers Ted and white H"...... ,...... HH"...... ,,...,...... "..,,....m.,,...".,.,...... ,.,.,,..".....,-..,,... B. pul(,hella

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Mareh 2009 SAKAI & NAGAMAsu-Boesenbergia ofBorneo 55

20a, Leaves buLlate; dark green around main yeins and almost silvery on raised area ････-･･････--･･････-･･･････-････････-･･-･･･-･･･-････-････.-...... "..-"".. B. hutchinsoniana B. L. Burtt & R. M. Sm. b. Leavcs smooth with a silvcr, yellowish or light green central cloud ...... ,..,,.,..,...... 21 2la. Petiele never exceeding 3 cm; lamina oblanccelate with attenuate basc .,,,,,...... ,... B, hirta (Ridl.) Merr. b. Petiolc usually much Longer than 3 crr]; lamina lanceolate to elliptic with cuneate base .,...... ,., 22 22a. Leaves with a sjlver cloud; flewets yel]ow, labelLum erangc spottcd ...... B. ornata (N, E. Br.) R. M. Sm, b. Leavcs with a yellowi$h cleud; fiowers orange or white with some yellow and reddish purple ..,.,,,,,...., 23 23a. Leaves 5-12 by 3-5 cm; fiower orange, darker at ba$c uflabcllum; anther dehiscing througheut its length

-･･･--･･･----･･･---･･-･･-･･･････--･･-･･--･･････-･･-･･･-･････...... ,..-...,,,.-..H.."m...... B. aurantiaca R, M. Sm. b. Leasics IS-23 by 4-6 cm; flower white with some yellow and reddish purple; anther dehiscing by apical pores, or anther dehiscent on]y in upper 213 ...... B. betatongensis A. D. Poulsen 24a. At least a few uppermost leafsheaths thickcncd and fbrming a cup-shaped structure .,...... 25 b. Leaf sheaths not thickened as above ..H...-..,...... ,,,.....",..,..M",,...".....,.,,,,,,.,...,.".,..,..H".,,.."...... ,...... H. 26 25a. Innermost leaf sheaths enclosing infloresccncc much shorter and wider than outer ones; leaves drying darkish-brown ...".".,,..."..,...."..H..."-.H...",.,,,,,,,,,."....,..",..,.H"..,...m B. )aeviyaginata S. Sakai & Nagam. b, Al1 leaves with mere or 1ess equa1 laminae; leaves green or grey-green when dry ･･･････--･･-･･--･････--･･-･･--･････-････････-･･.-･..-...... -...... ,...H..,.,.."..,,..."..,....,,..," B, urceoligenaA. D. Poulsen 26a. Anther dehiscing by slits throughout their lcngth ...... ,,,,.,,...,..,...... B. imbakensis S. Sakai & Nagam. b. Anther dehiscing by pores ..,-".H..""..H..--,,,,,,...... ,.."...,.."m,....m,...... ,..",..,..."..,....m...... ".h. 27 27a. Laminawider than4 cm (need to bc eheclced) ...... ,..,...... B. api(,ulata (Valeton) Loes. b. Width of lamina less than 4 cm .H..".mH,,-",....."...... ,..."..,,..m.,...... ,..",..,.H-..,....".,,,,,,,..."..H 28 28a. Lamina narrowly lanceolate, 12t20 by 1.5-3 cm, petiole usually 7-8 cm ...... B. stenopJrylla R. M. Sm. b, Lamina much shorter, up to 12 cm long, iflonger, petiole much shorter than 7 cm ...... ,...... 29 29a. Leaf sheath and ligule leng pubescent ,...... H...H.."..,,.."..,....."...... -...... B. parva (RidL) Merr. b. Leaf sheath and ligule almost gtabreus ...".,...... H...H.---,."...... ,.,.".,,,,,,"-."..."...... "..,, 3e 30a, Flowers yellow-orange "....,.,"m,,..."".-,,"..,.....m...... ,..h....."-..... B. oligospef'ma (K. Sehuni.) R. M. Sm. b. Flewers white and yellow occasienally with red in throat .....,...... B. subulata S. Sakai & Nagam.

Excluded spccies: B.striata (Valeton) Loes. for insufficient intbrmation.

We are gratefu1 to Protl Kitayama and the staff ofthe I"or- Bull, 55: 669-678. est Department Sabah for permissien and help during the Poulscn, A, D. 1993, TXN'o new species of Boesenbergia fie]d study; Dr. Axel Poulsen for providing informatien (Zingiberaceae) fi'om Borneo. Nord. J, Bet. 13: 289- about thc specimens; the curators ofBO, E, K, and SAN 294.

who kindly permitted us to cxamine and borrow speci- Sakai, S. & H. Nagamasu. 2006a. Notes on infioresccnce mens; Ms. Yuka Sugino for beautifu1 drawings. This structureofBoesenbeJgia(Zingiberaceae).ActaPhy- study is partly supported by a grant from the Japanese totax. Geobot, 57: 107 -111.

Ministry of Culture, Sports, Science and Teehnology Sakai, S. & H. Nagamasu. 2006b, Systeinatic studies of (#20405009) and Preject ofthe Research Institute fOr Hu- Borncan Zingiberaccae V. Zingjberoidcac ofLarnbir manity aiid Nature (P3-5). Hills, Sarawak. Blumea 51: 95 115.

Smith, R. M. 1987. A review of Bornean Zingiberaceae: References III (Hedychieae). Notes Roy. Bot. Gard, Edinburgh 43: 203--232. Cowl¢ y, J, l998. TWo new species of Boesenbergia Valeton, 1918. New notes on the Zingibcraceae of Java (Zingiberaceae) firom Brunei Darussalam. Kew Bull, and MaLaysia. Bull. Jard. Bot. Buitenzorg II, 27: 1- 53i 623-629. 167. Cowley, J, 2000. Three new gingers from Borneo. Kew

Received.r2ine 3, 2008; accqptedM,vember 10. 2008

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