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FOC | Family List | FOC Vol. 23 | Araceae | Amorphophallus

13. Amorphophallus tonkinensis Engler & Gehrmann, Pflanzenr. 48(IV. 23C): 87. 1911.

东京蘑芋 dong jing mo yu

Tuber brown, somewhat glossy, depressed globose, at least 9 cm in diam., root scars slightly raised, no offsets observed. Leaf solitary; petiole uniformly pale green or background pale grayish green with a clear bluish flush near base and on subterranean part, and with whitish spots, these often broader than long, irregularly shaped, and scattered over entire surface with short, longitudinal, blackish dots, these in proximal part often raised, petiole 80-200 × 2.5-7 cm, glabrous, turgid; leaf blade highly dissected, 80-200 cm in diam.; rachises winged only distally from basal main branchings, sometimes some nodes swollen and forming intercalary bulbils; leaflets elliptic-lanceolate to lanceolate, 8.5-24 × 3.5-6 cm, long acuminate. Inflorescence solitary, long pedunculate; peduncle colored as petiole, 22-50 cm (but probably longer), ca. 1 cm in diam. Spathe (all dimensions based on relatively small specimens) shortly convolute at base, erect or arching over spadix apically, outside green with a few transverse, whitish spots, inside whitish green with small, punctiform or slightly elongate verrucae, oval, 8-20 × 5-17 cm, strongly concave; outside limb dark green with an obscure blackish purplish flush and a few scattered, small whitish dots, inside bright green with a few small, whitish spots. Spadix sessile, shorter than or nearly as long as spathe, 7.5-17 cm; female zone cylindric or slightly obconic, 1-1.5 × 1-2 cm, flowers congested; ovary bright pale green, depressed globose, ca. 2 mm high, 2.5-3 mm in diam., 2-loculed; style whitish, straight, short, 0.8-1 × ca. 0.8 mm; stigma dirty pale yellowish brownish, depressed, large, ca. 1.5 mm high, 2-2.5 mm in diam., orbicular or oval in cross section, verruculose, entire, with an acroscopic shallow depression, or shallowly or distinctly 2-lobed, lobes rounded; male zone slightly or strongly obconic, 1.5-4 cm, 1.5-2 cm in diam. at base, 1.6-3 cm in diam. at apex, flowers congested; male flowers consisting of 4 or 5 stamens; stamens 3-3.5 × 1-1.5 mm; filaments ca. 1.5 mm, connate; anthers 1.5-2 mm, truncate; pores apical or subapical, elliptic, small, with a groove running from every pore to margin of anther; connective large, raised; appendix conic, oval-elliptic, or narrowly fusiform, 4.5-12 × 2.2-5 cm, obtuse, white, with many shallow, often longitudinally confluent depressions and with or without scattered, tiny, punctiform pustules, base with sterile stamens, gradually merging to form appendix wall. Fl. May.

Dense tropical forests, moist shaded places; 800-900 m. SE Yunnan [N Vietnam].


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