生活型

herb

形態特徵

• Herbs, 1–1.5 m tall; stem stout, square, angles obtuse, minutely hirsute; leafless toward base.
• Leaves petiolate, petiole slender, to 8 cm long; blade thinly membranaceous or papery, elliptic or cuneate or truncate or rounded, margins coarsely crenate-serrate, glabrous or with minute scattered hairs on nerves on both surfaces. Verticillasters many-flowered, axillary, globose, ca. 3 cm in diam., surrounded by few bracteoles at base; bracteoles subulate, ca. 6 mm long, shorter than calyx, hirtellous.
• Flower sessile; calyx turbinate, abruptly spreading at mouth, densely hirtellous or minutely hispid, glabrescent, inconspicuously veined, tube 6–7 mm long, teeth triangular; corolla yellow or yellowish, less often whitish, 1.5–2 cm long, tube annulate within, hirtellous outside, upper lip erect, oblong, rounded at apex, lower lip spreading, 3-lobed, middle lobe larger, undulate; stamens 4, anterior 2 longer; anthers 2 celled, parallel or divergent; ovary apex truncate; style apex subequally 2-cleft, lobe subulate.
• Nutlets black, obovoid, 6 mm long, acute and triquetrous below, rounded above.
• Chromosome number 2n = 34.

物候

Flowering time from July to September.

分布

• 世界 : Eastern Himalaya to Thailand, Indo-China, S. China and Malesia.

引證標本

TAIPEI: Wenshan, Suzuki 19279*. ILAN: Taipingshan, Suzuki 4025. HSINCHU:Wutzushan, Kawakami s. n. 1906. NANTOU: Chingshuikou, Huang et al. 979*. Hoshe, Huang 4074. KAOHSIUNG: Shanping, Huang 4922.

引用文獻

• HUANG, Tseng-Chieng, HSIEH, Tsung-Hsin and CHENG, Wu-Tsang, Flora of Taiwan, second edition 4: 504. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)