生活型

herb

形態特徵

• Annual erect to ascending herbs to 25 cm tall, often branched from base; branches sharply 4-angled, glabrous or pubescent on angles.
• Leaves opposite, subsessile, linear-lanceolate, 10–35 mm long, 2–7 mm wide, apex acute, often mucronulate, base cuneate, margin often revolute, glabrous except setulose along upper margin, uninerved; stipular sheath deltate, with 3 or 5 unequal setae.
• Flowers 1–4 in axillary and terminal cymes, peduncles 4–12 mm long, pedicel 1–10 mm long; calyx lobes ca. as long as ovary, deltate-acuminate, widely separated on fruit; corolla white or very pale purple, ca. 2 mm long, hairy in throat; stamens inserted above base of tube, included; style included.
• Fruit globose, ca. 2 mm in diam.

分布

• 台灣 : a common lowland plant.
• 世界 : Tropical regions worldwide.

引證標本

CHANGHUA: Tienchung, Huang 4613. TAINAN: Nantou, Kao 10153; Tainan, Hsu 6453.