Hoogl. Papyracea (1
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Additional notes on Dilleniaceae 1—9 by R.D. Hoogland (Issued May 1st, 1959) Since the publication of the Revision of the Genus Dillenia (Blumea 7, 1952, pp. 1—145) a number of additional collections have come to my notice. As is to be expected, the most interesting ones are from Eastern the has Malaysia, where genus developed a high degree of diversity and where the number of collections is still relatively small. 1. Dillenia and D. Merr. c. pteropoda (Miq.) Hoogl. papyracea (1. p. 28) (fig. 1) Fig. 1. Dillenia pteropoda (Miq.) Hoogl. After Pleyte 260. X 3/5. *) C.S.I.R.O., Division of Land Research and Regional Survey, Canberra, Australia. 578 BLUMEA VOL. IX, No. 2, 1959 and D. Dillenia pteropoda papyracea were considered identical on account of the striking similarity of the leaves. D. pteropoda (Wormia Balmaheira pteropoda Miq.) was described from on leaves only and though the species was collected in the Moluccas on some occasions since, the flowers were still unknown when I revised the genus. A recent collection with flowers Mumar River track ( Pleyte 260, near Mumar, Tasoa—Gn. Sembilan, 300 m alt., 25. XI. 1951; L) has come to my notice and shows that two distinct involved. species are It appears reasonable to retain Miquel's name for the species occurring in the Moluccas, though the two species cannot be distinguished with certainty from sterile specimens. The correct for the is Dillenia name Philippine species then papyracea Merr. (Philip. J. Sci. Bot. with D. Merr. J. Sci. 9, 1915, p. 520), megalophylla (Philip. 14, 1919, p. 421) and Wormia papyracea (Merr.) Gilg & Werderm. (in & Nat. Pfl. Aufl. Engl. Prantl, fam. 2. 21, 1925, p. 35) as synonyms. The I of D. fits description gave pteropoda (Miq.) Hoogl. (1. c. p. 28) this species. As the similar in their I two species are very vegetative parts, only here give the description of one flower of Pleyte 260 (cf. fig. 1). Flowers solitary, terminal, probably never expanding, sepals only slightly diverging in anthesis, petals falling without spreading. Pedicel ea 15—20 mm long, 5 mm thick, thickened to 8 mm at the apex, without bracteoles. Sepals 18, increasing in size towards the centre of the flower, the about 20 X 20 the innermost broad- outermost one orbicular, ca mm, one elliptic, ca 50 X 43 mm, all glabrous outside and inside. Petals 7, red, 100 rounded narrowly obovate, cucullate, ca X 40 mm, at apex, narrowed towards base (lower 30 mm about 8 mm broad). Stamens ca 220, slightly curved in all bud, of approximately the same length, 45 mm long; filament 22—30 mm long, 0.6—0.8 mm broad; anthers 0.8—1.2 mm broad. Carpels 10, arranged around a narrow conical receptacle, slightly spirally twisted, lanceolate-oblong, ca 17 X 6 mm, glabrous, each with ca 15—20 ovules; styles parallel, 23 mm long, eylindric, 1.3 mm thick at the hase, channelled above. Both will identified species be with my key (1. c. p. 18) as D. ptero- poda. They can be separated as follows: Sepals not oo. Flowers fully opening, the petals coherent in anthesis, cucullate, ca 10 cm long, red D. pteropoda 5. Sepals Flowers fully opening, the petals spreading, flat, ca 5 cm long, white D. papyracea D. pteropoda is most distinctly characterised by the polymerous calyx (also found in D. reifferscheidia and D. marsupialis from the Philippines, which have different of and species a type androecium) possibly corolla (7 petals in the only flower examined). The latter character has not been in found any previously known species of Dillenia and it will be interesting to flowers the studied study more as one may have been incomplete. The corolla is not spreading in anthesis but falls off as a whole, a character previously not found West of New Guinea. The species was recently also collected on one of the islands off the West coast of New Guinea: Koster BW 1409, Salawati (L). K. D. HOOGLAND: Additional notes on Dilleniaceae I—9 579 2. Dillenia ovalifolia Hoogl. (1. c. p. 33) Our knowledge of this species has been supplemented by three col- lections from Waigheo and Sorong, collected by Dr. P. van Royen (in L). Van Royen 3409 from Mlasoen Hill E of Sorong is intermediate between indumentum var. ovalifolia and var. sericea Hoogl. in having the sericeous lower side of and basal only on young branches, petiole petiolar wings, part of midrib and lower nerves, and lower part of pedicel; the upper and the It part of the pedicel sepals are practically glabrous. does not to maintain the varieties as distinct taxa. appear possible two sharply Van Royen 5240 and 5515 were both collected in Waigheo Island, NW of the Vogelkop peninsula. Herewith the occurrence of two species in Waigheo has been established, the other species being D. alata (DC.) Gaudichaud Wormia The Martelli described from Waigheo by as apetala. two species are quite similar in leaf-shape and particularly in the form and structure of the petiolar wing, but there is no doubt that Gaudiehaud's and specimen represents D. alata not D. ovalifolia. D. alata was apparently not collected by Van Royen. According to Van Royen, the petals are pink (3409), pinkish red sofar white recorded. (5240) or red (5515), whereas only petals were A similar variation is found in D. reifferscheidia where the rose-red form was distinguished as var. rosea Elm. 3. Dillenia montana Diels (1. c. p. 37) This species, previously only known from two incomplete collections (NGF 1026, 3380) and the type (which I did not see) has recently been re-collected in some localities in the Central Highlands (Western High- lands Distr.) of New Guinea : Hoogland & Pullen 6194 & 6265, Komun-Pin Divide E of Korn, and Robbins 516, Kubor Ranges above Kuli. I studied six flowers and fruits of H. & P. 6265, preserved in alcohol, and found the following structure of the flower: Sepals 5 (5 X) or 7 (1 X), in young flowers (buds) gradually diminishing in size from outer to inner; at time of flowering outer 3 about size 24 45 40 same (33 mm high, mm wide; = mm long, mm broad, measured on the outside along the curve), inner 2 smaller (29 by 21, third resp. 39 by 41 mm); in fruit sepal largest (38 by 32, resp. 54 by 51 mm), the outer (33 by 30, resp. 46 by 46 mm) and inner (35 by 27, resp. 50 by 55 mm) ones smaller. One nearly mature fruiting specimen had 7 sepals, of which no. 5 was distinctly the largest being 45 by 33 (resp. 62 by 58) mm. There are 5 (2 X) or 6 (2 X) petals, ca 36 by 32 mm (measured along the curve), easily distinguished from the sepals by the much thinner 2 base 4—7 in the The (ca mm thick) (against mm sepals). petals ap- pear to fall off at some stage of the flowering, though I could not find under the under similar such any petals trees as one can species as e. g. and D. schlechteri. D. papuana The ca 110 stamens are ca 18 mm long, including 7 mm long filament, at the time of flowering; the anthers are ca 1.4 mm wide with the con- nective hardly exceeding the anthercells. 580 BLUMEA VOL. IX, No. 2, 1959 There are 9 (3 X), 10 (.2 X) or 11 (1 X) carpels, ca 14 mm long, 3 mm radially., and 2.5 mm wide at the time of flowering, glabrous, each the is and with 2 rows of 6—7 ovules; style ca 11 mm long recurved the In the the near middle. fruiting stage carpels are enlarged to 30 X 8 X 9 mm, with 1—3 seeds developed in each carpel, the styles are twisted. seeds not only curved but also The are ca 5 X 5 mm, enclosed by a 7 mm long fleshy aril with a split on one side and a slight opening at the apex. Fig. 2—5. Dillenia nalagi Hoogl. 2 a—d, stamens; e—i, staminodes; left to right = from from — centre of flower outward — 3. gynoecium, view outside 4. id., longi- tudinal medial section — 5. schematic representation of the structure and relation of and shaded = broken lines = gynoecium androecium; = gynoecium, full lines stamens, staminodes. R. D. HOOGLAND: Additional notes on Dvlleniaceae I—9 581 4. Dillenia nalagi Hoogl. sp. nov. (fig. 2—6) in 15 Type: Hoogland 3411, near Devatutu, regrowth; fairly common; alt. ca m; fl. -)- fr. 22. VII. 1953 (holotype in CANB, isotypes in A, BM, BO, BRI, K, L, LAE, 1 km US). Paratypes: Hoogland 4 Taylor 3438, ca inland of Iwaia, Robinson Bay, dominant tree in juvenile rainforest on a ridge; very common; alt. ca 75 m; fl. -j- fr. 24. VII. 1953; Hoogland 4" Womersley 8625, along the Opi River near Patikiari, on river- bank and in rainforest well-drained alt. 30 f 1. on soil; common subcanopy tree; ca m; —j—- fr. 14. VIII. 1953. Descriptio typi: Bami novelli dense sericeo-hirsuti; cicatrices amplexicaules. Folia vel 24—80 15—30 18 rotundata ovata elliptico-oblonga, ca X cm, ca —32-nervata, apice basi vel retusa, obtusa, margine undulata; supra lucida, glabra, subtus breviter sericeo- —25 hirsuta, glabrescentia. Petiolus ca 10 cm longus, alatus alis amplexicaulibus, caducis, sericeo-hirsutis. lineari-oblongis, supra glabris, subtus Inflorescentiae terminales, mox laterales ad 14 flos terminalis bracteatus et oppositifoliae, biflorae, usque cm longae; bractea spathulata, ca 35 X 17 mm, caduca, bracteolo uno laneeolato, ca 20 X 8 mm, 2 caduco.