滇南芋 dian nan yu

Colocasia esculenta (Linnaeus) Schott var. antiquorum (Schott) F. T. Hubbard & Rehder; C. fontanesii Schott; C. gaoligongensis H. Li & C. L. Long; C. gongii C. L. Long & H. Li; C. lihengiae C. L. Long & K. M. Liu; C. tonoimo Nakai.

Herbs, perennial, terrestrial, with stolons (stoloniferous runners) and a usually erect rhizome. Rhizome 120-135 × 12-18 cm; stolons (stoloniferous runners) 6-12, trailing horizontally, pale green to pale purple, simple, thin, 70-80 × ca. 0.5 cm; internodes cylindric, 15-25 cm, without tubercles. Leaves 4-8 together; petiole light green to reddish purple, 55-140 cm, sheathing in basal 1/2; leaf blade pale green or yellow-green abaxially, sometimes with a purple margin, green or yellow-green adaxially, glossy and wettable (water forming an even coating), peltate, ovate-cordate to sagittate-cordate, 30-80 × 18-70 cm, membranous; primary lateral veins 5-9, pale green or purple, interprimary veins inconspicuous. Inflorescences 3-5(or 6); peduncle green or purple, cylindric or subtrigonous, shorter than petioles, 40-70 × 1.5-2 cm. Spathe constricted between tube and blade; tube yellowish green or purple, oblong, 4-12 × 1.4-4.5 cm, subcylindric; limb convolute at base, suberect to reflexed, golden yellow, sometimes with purple margin, oblong, oblong-lanceolate, or obovate, 7-24 × 4-14 cm, apex obtuse or acute. Spadix sessile, shorter than spathe; female zone golden yellow, cylindric, 2-3 × 0.3-0.75 cm, ca. 1/2 as long as spadix, with a few yellow interpistillar staminodes; female flowers obovoid; ovary 1-loculed; placentae 2; stigma sessile or subsessile, disciform, 6-lobed; sterile zone whitish, cylindric, 1-5 × 0.3-1.8 cm; synandrodes depressed obpyramidal; male zone yellow, cylindric, 3.5-14 × 0.4-1.5 cm; synandria 3-10-androus, yellow, 1-2 mm; appendix absent or erect, narrowly conic, ca. 5 cm. Fruit not seen. Fl. May-Sep. 2n = 28.

Dense rain forests, evergreen broad-leaved forests, and forest margins in valleys in limestone areas, along streams in evergreen broad-leaved forests, moist shaded thickets; 600-1200 m. S and W Yunnan (Mengla, Tengchong, Yingjiang) [NE India, N Laos, N Myanmar, N Thailand].