生活型

herb

形態特徵

• Annual herbs, covered with septate hairs, 15–40 cm tall; stems and branches erect, sometimes tufted at base.
• Leaves petiolate; petioles puberulent, 0.5–1.5 cm long; blade 1.5–4 cm long, 1.3 cm wide, ovate to broadly ovate, base rounded to subcordate, apex obtuse or rounded, margins serrate, both surfaces sparsely puberulent, densely so on veins and veinlets.
• Inflorescences axillary cymes, sometimes forming loose terminal racemose cymes. Flowers pedicellate; petioles sparsely puberulent; calyx campanulate, 3–5 mm long, puberulent, 10-veined, teeth subequal, lanceolate-triangular, apex acute; corolla red, bilabiate, nearly included, 4–6 mm long, upper lip broadly ovate, lower lip 3-lobed, central lobe reniform, 2 lateral lobes broadly ovate; filaments minutely hairy; style gynobasic, stigma bifid.
• Nutlets ovoid, slightly granulate, 1–1.2 mm wide.

物候

Flowering time from April to June.

分布

• 台灣 : Weeds in waste areas in northern Taiwan.
• 世界 : Russia, Europe, China, North and South America.

引證標本

TAIPEI: Taipei, Cheng 408*, 643, Kuo 4885, Hsu 433A, Chon 2. TAOYUAN: Taoyuan to Jenmei, Kuo 6116.

參考文獻

• HUANG, Tseng-Chieng, HSIEH, Tsung-Hsin and CHENG, Wu-Tsang, Flora of Taiwan, second edition 4: 539. 1998.  (Fl. Taiwan 2nd edit.)
• Huang and Cheng, Flora of Taiwan 4: 525. 1978.  (Fl. Taiwan)