生活型

herb

形態特徵

• Ascending or decumbent herbs, to 100 cm tall, moderately to densely stellate pubescent and loosely strigose throughout; stems angular, much branched, armed with recurved prickles, rooting at lower nodes.
• Leaves hastate, with two divergent lobes, 2–5.5 cm long, 3–5.2 cm wide, middle lobe linear-lanceolate, apex acute, basal lobes lanceolate, acute, beneath midvein retrorsely prickly; petioles 1–4.5 cm long; ocreae foliaceous, upper margins expanded, green, dentate, ciliate.
• Inflorescences 1–2-flowered fascicles in head-like panicles, terminal or in axils of upper leaves, branched, densely flowered; peduncles glandular pubescent at upper position, 1–3 cm long; bracts lanceolate, upper margins ciliate. Flowers white to pink; pedicels included; perianth segments 5, elliptic, 2–3 mm long, apex obtuse; stamens 8; styles 3-cleft, included; nectaries present.
• Achenes dark brown, trigonous, smooth, slightly shining, ca. 2.5 mm long.

分布

• 台灣 : in wet lowland areas in the northern part of the island.
• 世界 : E Siberia, China (SW, S, C, E, N & NE), Korea, Japan and Russian Far East.

引證標本

TAIPEI: Da-an, Simada 700, Sasaki s. n. 1926.

引用文獻

• LIU, HO-YIH, Flora of Taiwan, second edition 2: 305. 1996.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)