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Amorphophallus ongsakulii Hett. & A.Galloway
Tuber globose, to 2 cm in diam., annually producing numerous (to ca. 15), fusiform offsets. Petiole 7-9 cm long, ca. 2 mm in diam., smooth , pale yellowish green to dirty greenish brown, with or without darker, thin stripes; lamina 13-16 cm in diam., rachises narrowly winged throughout; main segments highly dissected; leaflets very small, 3-11 mm long, 2-4 mm in diam., elliptic to lanceolate, apiculate, margin very finely, slightly irregularly serrate, upper surface dark green with distinct whitish midrib, lower surface paler. Flowering shortly after leaf maturation, sometimes flowering up to four times consecutively, with ca. 3-4 weeks separating each flowering. Peduncle smooth, 16 cm long, 2 mm in diam., base whitish gradually changing to very pale yellowish-brown; spathe elongate ovate, 34 mm long, 14 mm \vide, erect, base tubular, loosely convolute, outside greyish-green with parallel dark greyish veins, inside dark purple, strongly verrucose, limb basal half auriculate, upper half pressed against the appendix, apex acute, outside whitish with thin, pale green venation, slightly transparent. Spadix sessile, longer than spathe, 42 nun long, slightly curved forward; female part 2 mm long, 3 mm in diam., flowers slightly distant; male part elongate, slightly conical, 12 mm long, 3 mm in diam. at the base, 2 mm in diam. at the apex, flowers distant, less so in the upper part; appendix shortly stipitate (stipe 1 mm long, purple), 27 mm long, 2 mm in diam. at the base, 1 mm in diam. at the apex, narrowly elongate conical, base narrowed to the stipe, apex obtuse, surface smooth, pale yellowish-brown. Ovaries depressed, two-lobed, ca. 2 x 1 mm in diam., 0.8 mm high, base white, upper half pale purplish, bilocular, locules separated by two strong lateral constrictions of the ovary wall; style conical, 0.2 mm long, 0.4 mm in diam. at the base, pale green; stigma depressed, 0.8 mm in diam., 0.3 nun high, very shallowly bi-lobed, minutely echinate, pale green. Male flowers consisting of 2-3 stamens; stamens irregularly angulate in shape, truncate, 0.3-0.5 mm in diam., 0.2-0.3 mm high; filaments ca. 0.1 mm long fused whitish· anthers 0.1-0.4 mm high, reddish purple; pores apical, orbicular. Fruiting part more or less globose, berries crowded; berries ovate, truncate, ca. 6 mm in diam., ca. 4 mm long, deeply bilobed, contracted between the seed-containing locules, surface rugulose, pale green with whitish punctation, area around the style remnant dark greyish green, 2-seeded; seeds globose or subglobose, 2-3 mm in diam., greyish to dirty greenish.