生活型

herb

形態特徵

• Erect, perennial, succulent herb with poorly developed rhizomes. Stems ±zigzag, pilosulose at first, later glabrescent, 50–80 cm high, to 4–9 mm thick, internodes 7–26 cm long. Stipules glabrous, caducous, triangularlanceolate, 10–20 mm long, 5–7 mm wide, apex acuminate, margin entire.
• Leaves adaxially sparsely pilosulose or scaberulous, abaxially sparingly pilosulose on major veins, oblique, ovate to narrowly ovate, 11–24 cm long, 5–15 cm wide, apex acuminate to caudate, base obliquely cordate, margins serrate, shallowly lobed and irregularly serrulate or denticulate; venation palmate-pinnate, basal veins 6–7; petioles pilosulose or puberulent, later glabrescent, 10–23 cm long, to 4–7 mm across. Bracts glabrous or near so, caducous, narrowly ovate to narrowly triangular, 5–20 mm long, 2–8 mm wide, apex acuminate, margin ciliate.
• Inflorescence 4–9 cm long, axillary; peduncles ascending, subglabrous or sparsely pilosulose, 3–8 cm long, 2–3.5 mm thick. Tepals white. Staminate flowers: pedicel ca. 2.5 cm, tepals 4, decussate, outer two broadly obovate to orbicular, 15–25 mm long, 10–18 mm wide, inner two oblanceolate to narrowly obovate, 7–20 mm long, 5–8 mm wide; androecium actinomorphic, ovoid, without androphore, stamens ca. 60–80, golf-club shaped, anthers narrowly obovoid to oblong, yellow, 2–3 mm long, 0.9–1.1 mm across, connective apex protruding, filaments 1.6–2.7 mm long (upper stamems longer), fused to a short central column. Pollen grains irregular, shriveled and unstainable. Carpellate flowers: pedicel 1.3–2 cm long, tepals 5(–6), unequal to subequal, obovate, to oblong, the largest 15–21 mm long, 13–17 mm wide, the smallest 9–15 mm long, 6–9 mm wide; styles 3, yellow, 4.9–5.3 mm long, at their base fused ca. 0.5 mm long, each bifid; ovary nodding or somewhat pendent, trigonous-ellipsoid, 3-locular, longitudinally shallowly grooved between the locules, 3- winged; placentae axile, bilamellate.
• Somatic chromosome number, 2n = 22.

引證標本

TAIWAN. Nantou County, Luku Township, Hsitou, Peng 15911 (HAST).