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Larpoxylon Macrospermum

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Larpoxylon Macrospermum 6B PRINCIPES lVoL. 33 Principes,33(2), 1989, pp. 68-73 Larpoxylont1 I macrospermum Jottt'tL. Down e.rutNererm W. Usr 18 Amelia Street, Albion 4010, Queensland,Australia, and L. H. Bailey Hortorium, 467 Mann Library, Cornell Uniaersity, Ithaca, NY 14853 "Genera When Palmarum" went to tapering to an irregularly rounded, more press in 1986, Carpoxylon was known or less bifid tip, stiff, coriaceous, horizontal from fruit only. Since lack of information to erect, glabrous adaxially, with numerous made it impossible to include the genus in punctate scales abaxially, midveins most the hierarchy of the classification, it was prominent, marginal veins next largest, two "Incertae placed in an Sedis" group along other pairs of large veins conspicuous. with the Madagascar gerrus Masoala. The transverse veinlets not evident' Inflores- rediscovery of CarpoxyLoz, described in cences infrafoliar, branched to three orders the accompanying paper (Dowe 1989), basally, to one order distally, branches allows us to provide here a complete stiffiy spreading; peduncle short, stout, description of the genus and its one species elliptical in cross-section; prophyll com- and to consider further the relationships pletely encircling the peduncle at insertion, of this unusual palm. tubular, two-keeled, tapering distally, split- ting abaxially, tomentose; peduncular Carpoxylon H. A. Wendland& Drude, bracts 2, the first inserted shortly above Linnaea39: I77. 1875. TYPe:C. the prophyll, the second an equal distance maGrospermumH. A. Wendland& above the frrst, both tubular, complete, Drude.(Fig. l, CoverPhoto; see also tapering to rather short pointed tips,.gla- Fig. l, accompanyingpaper, p. 65). brous, caducous; scars of 2-3 incomplete bracts above the inner peduncular bract; Moderate, solitary, unarmed, Pleo- rachis about twice as long as the peduncle, nanthic, monoecious palm. Stem erect, rachis bracts low, ridgelike in slitlike cav- longitudinally fissured, swollen basally and ities, subtending ca. l0 primary branches; with a boss of adventitious roots, prom- primary branches stout, dorsiyentrally flat- inently ringed with slightly sunken leaf tened, with a short bare part and two large scars, internodes short. Leaves regularly lateral pulvini at the base, bearing very pinnate, spreading but arched towards the shallow bracts, each in a slitlike cavity, tips, neatly abscising; sheaths forming a subtending rachillae; rachillae angled, crownshaft, crownshaft glossy, glabrous to tapering, also with basal pulvini, rachilla lightly scaly, splitting opposite the petiole; bracts shallow, rounded, subtending triads petiole short, wider proximally, ridged of flowers for about one-third their length, adaxially, rounded abaxially; rachis flexi- paired staminate flowers with some inter- ble, broadly ridged adaxially at base, nar- mingled solitary staminate flowers above rowly ridged distally, rounded abaxially, the triads. and solitary staminate flowers extending beyond the apical leaflets in a distallv. in triads one staminate flower often flexible tip; leaflets subopposite, in one rank, distal and one lateral to the pistillate flower' apically and basally inserted at right angles flowers lateral to each other in staminate to the rachis, more obliciuely inserted at dyads, rachilla ending in a short bare por- midleaf, leaflets single fold, erect, linear, tion; first bracteole surrounding the pistil- r9891 DOWE AND UHL: CARPOXYTON ffi ti,r1\ I n il{\1 n UJ(.(L//frii Cafpoxylon macrospermum, a, portion of rachilla in bud x I %; b, scars of staminate dyad x 3Vz;c, staminate bud, x6/t; d, staminate bud in vertical section x6/t e, two stminate petals x6%; f, staminate petal in two views x 67ti g, portion of rachilla with staminate bluds x 2Tt; h, staminate bud sepalsremoved x 6Tz; i, slaminate pelals x 6%; j , scars from floral triad x 3Tt; k, triad x 3yst I, androecium x 6Ts.;m, stamen in three views x 6?4; n, pistillode x62A; o, young pistillate bud x67t; p, pistillate sepals x62A; q, pistillate bud in vertical section *6yu: ,, pistillate petals x6Ts; s,'gynoecium with staminodes x67t; t, end of stigma x I; u, end of stigma enlarged x3; v, fruit x/z; w, frtit in vertical section xTsi x, endocarp xTzi y, seed in three views x?6; z, seed in vertical section xVz. rU PRINCIPES lVoL. 33 late flower large, rounded, coriaceous, the scars whitish, prominent, internodes 7 cm second smaller and more shallow. Stami- long near base to 2 cm long distally. Leaves nate flowers very asymmetrical in bud, regularly pinnate, 3.5 4.0 m long; crown- rounded or pointed apically; sepals 3, dis- shaft green, I.5-2.0 m long, somewhat tinct, irregular, imbricate basally, keeled, larger in diam. towards base; petiole 25 prominently ridged when dry; petals 3, cm long or less, wider proximally; rachis distinct, valvate, tips thickened, ridged wide to 6.5 cm at base, 4.5 cm wide in when dry; stamens 6, filament- slender, middle, 4.0 cm wide distally, extending inflexed at tip, anthers more or less sag- beyond apical leaflets in a flexible tip about ittate basally, slightly bifid apically, dor- 12 cm long; leaflets about 70 on each side sifixed just below the middle, latrorse, ver- of rachis. proximal ones ll4 x 1.5 cm, satile, connective tanniniferousi pollen mid-leaflets I22 x 3.2 cm, distal ones 36 elliptic in polar view with finely reticulate x t.5 cm. Inflorescences infrafoliar; tectate exine; pistillode elongate, slightly peduncle stout, elliptical in cross-section, Ionger than anthers in bud, tip enlarged, about 14 cm long, 4 cm diam.; ProPhYll rounded. Pistillate flowers in young bud, 70 cm long, about 8 cm wide, peduncular irregular, rounded; sepals 3, distinct, very bracts two, the first inserted ca. 5 cm broadly imbricate, extremely thick basally; above the prophyll, the second 5 cm above petals 3, very broadly imbricate, thick the first, each 70 x 7 cm taPering to a basally, tips thick, valvate; staminodes woody tip ca. 5 cm long; scars of two to joined in a shallow ring with about 5 broad three incomplete bracts above the inner toothlike tips; gynoecium irregularly obo- peduncular bract; rachis ca. 36 cm long, void, unilocular, uniovulate, stigmas 3, rachis bracts subtending l0 primary fleshy, ovule erect at stage studied, ? anat- branches; primary branches stout, lower ropous. Fruit obovoid to ellipsoidal, red at ones to 2 cm wide with a basal bare portion maturity, stigmatic remains eccentrically 7-8 cm wide; rachillae stout, ca. 5 mm apical, epicarp smooth, wrinkled basally diam. and 30-40 cm long. tapering. also when mature, mesocarP thick, with close with basal pulvini, bearing spirally packed longitudinal fibers, endocarp rather arranged, rather distant triads, 1.5-1.0 thick, whitish, bony, longitudinally ridged, cm apart, for about one-third their length, large operculum over embryo. Seed obo- rachillae much reduced in diam. to 2 3 void, raphe elongate, branches longitudi- mm distally, first bracteole surrounding the nal, endosperm homogeneous. Germina- pistillate flower shallow, 2-4 mm high, tion adjacent ligular, eophyll bifid. rounded, coriaceous, evident in fruiting Distribution: One species rediscovered rachillae, second bracteole smaller and 30 November 1987 on Espiritu Santo, more shallow. Staminate flowers very ir- Vanuatu where growing in silty alluvium regularinbud,2.S 4.5 x 2.0 mmin young on the edge of a small stream. The pop- material examined, rounded or pointed api' ulation may have been planted (see accom- cally; sepals2.5 x 3.0 mm; petals 2.9 x panying article), thus the wild location is I.7 mm; stamens six, dorsifixed near the uncertain. The original description men- middle, filaments slender, 1.5 mm long' tions the mountains of the Vanuatu Islands. inflexed at tip; anthers 2.0 mm long; pis- tillode 2.0 mm long. Pistillate flowers stud- bud. 2 x 6 mm. irreg- Carpoxylonmacrospermum H. A. ied in very young ular; sepals various in size, abotr 4 x 2 Wendland & Drude, Linnaea 39: I77, mm; petals imbricate, also not completely Plate 1, Fig. 3. 1875. Type: Vanuatu, developed and varying in size, about 3 x fruit only,? in GOET,.not found. 2 mm1' staminodes 0.5 mm high; gynoe- Stem erect to IB m, ca. 35 cm diam. cium obovoid,2 mm high x 1.5 mm wide. DBH, baseenlarged, 50 cm in diam., leaf Fruit slightly obovoid to ellipsoidal, 6 x 19891 DOWEAND UHL: CARPOXYLON 7I 3.5 cm, stigmatic remains eccentrically 2- Seed irregularly ridged, furrowed arrd sculp- tured with adherent fibers ...-...,,.... ALsmithkt apical; epicarp thin, mesocarp 2 mm thick 2. Seed :t small, not ridged or sculptured .........3 thick, with large fibers, endocarp 3 4 mm 3. Staminate flowers borne in vertically oriented thicker basally, longitudinally ridged, bony pairs sunken in distinct depressions distally, below ridges, operculum circular, large. smaller than and lateral to pistillate flowers fruit large, with Seedlarge, ellipsoidal,4 x 2.5 cm, raphe proximally on the rachillae; apical stigmatic remains. Fiji .,.,,. Neoxeitchia extending laterally, little fibers abundant, 3. Starrrinate flowers borne in horizontally ori- anastomosing, endosperm homogeneous ented pairs distally, lateral to pistillate flowers with central cavity; embryo basal. Ger- proximally on the rachillae; fruit moderate, mination adjacent ligular, eophyll bifid. rarely large rvith apical, lateral, or hasal stig- matic remains ...--........- 4 4. lnflorescence interfoliar; fruit covered rvith Discussion prominent corky warts; stigmatic remains basal fruit ..............5 Curpoxylon, then known only from in .............., 1. Inflorescence interfoliar, or infrafoliar, fruit fruit, was put in AreceaeIncertae Sedis in merely to granulose rvhen "Genera ,snooth or pebbled Palmarum" (Uhl and Dransfield dr-v; stigmatic remains various .. ....-........,..6 1987).The newlycollected material allows 5. Peduncular bract inserted near the base ol a subtribalplacement. The large opercu- the peduncle; fruit more than 2.5 cm in diam- eter. Marquesas Islands ..-....-..,..,......... Pelagodoxa lum over the embryo places the genus 5. Peduncular bract irrserted at the apex of the clearlyin SubtribeIguanurinae of the Are- peduncle: fruit 1.5 crn in diameter or less.
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