生活型

herb

形態特徵

• Perennial rhizomatous sparsely pubescent or subglabrous herbs, upright or spreading, 10-30 cm tall. Roots fibrous.
• Leaves dimorphic, sparsely pubescent or subglabrous on adaxial surface, pubescent or sparsely pubescent on abaxial surface. Radical leaves simple, 3-parted or ternate, 0.7-2.4 cm long, 1-3 cm wide; orbicular, ovate or broadly elliptic, unlobed, 3-lobed to 3-parted; apex acute; base rounded, obtuse, truncate or cordate; margin serrate or coarsely serrate; petioles 5-8.5 cm long. Cauline leaves 3-parted, segments narrowly oblong or lanceolate; apex acute; base rotund or turncate; margin coarsely serrate or entire; sessile or subsessile.
• Inflorescence a terminal cyme; Pedicels 2.1-3.5 cm long, pubescent. Flowers 5-14 mm in diam., yellow; sepals 5, spreading, broadly elliptic to elliptic, pubescent outside, glabrous inside, concave; petals 5 or more, 5-7 mm long, obovate, narrowly obovate or elliptic, glabrous on both sides, claw ca. 0.8 mm long; stamens numerous, ca. 2.5 mm long, anthers oblong, ca. 1 mm long, filaments linear; carpels many, glabrous; receptacle glabrous.
• Fruiting head ellipsoid to globose; achenes 1-1.5 mm long, elliptsoid-orbicular to obovoid-orbicular, glabrous, laterally convex; styles persistent, slender, hardly recurved.

物候

Flowering (January-) Feburary to May; fruiting March to June.

分布

• 台灣 : semi-wet places and open places below 500 m in the northern part.
• 世界 : Mainland China, Cheju and Japan.

引證標本

TAIPEI: Tatunshan, Suzuki s. n. 1932; Kuanyingshan, Chuang 2557; Tanshui, Masamune s. n. 1930 (Holotype of Ranunculus formosanus Masamune, TAI!). TAOYUAN: Chungli, Kawakami & Simada s. n. 1909 (Type of Ranunculus leiocladus Hayata, TI!); Hsutsukang, Sasaki s. n. 1909.

引用文獻

• YANG, T. Y. ALECK and HUANG, TSENG-CHIENG, Flora of Taiwan, second edition 2: 562. 1996.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)