生活型

herb

形態特徵

• Herb annual, ascending or erect, to 25 cm tall. Stem square, slender, branched at base; phyllotaxis opposite.
• Leaves petiolate; petiole ca. 5 cm long; blade ovate, to 2 cm long, both surfaces hairy, base truncate, margin rounded dentate, apex rounded. Inflorescence of dense verticillate cyme; foliaceous bracts opposite, petiolate; petioles 0.5–2 cm long; bract enclosing the cymes, broadly ovate, 2 – 3.5 × 1.5 – 4.5 cm, base cuneate to attenuate, simple, apex acute; lobe 2 – 5 mm long.
• Flowers sessile. Calyx campanulate, 7 – 9 mm long, puberulent, 5-toothed; teeth narrowly triangular, equal. Corolla reddish purple, tubular, 1.5 – 2 cm long, bilabiate; upper lip galeate; lower lip 3-lobed; lateral lobes triangular, apex acute; central lobe fan-shaped, deeply divided. Stamens 4, didynamous, lower pair longer; anthers 2-celled, divergent, hairy at ends; stigma bifid.
• Nuts ca. 2.5 mm long, 3-keeled, scabrous.

分布

• 台灣 : along the roadsides of a forest trail in middle elevations of central Taiwan.
• 世界 : native to Europe, and naturalized in Australia, Japan and North America.

引證標本

Taiwan. Nantou Co., Jenai Town, Yunhai, 18 Mar 2008, M.-J. Jung 2482 (TAIF); same loc., 3 Mar 2009, M.-J. Jung 3747 (TAIF).

參考文獻

• Ming-Jer Jung, Ming-Jou Wu and Shih-Wen Chung, Taiwania 54(4): 391-398. 2009.