生活型

herb

形態特徵

• Weak annuals with fibrous roots, hairy or glabrate; stems branched at base, branches many, 6–20 mm long, spreading.
• Radical leaves oblanceolate-oblong, 3–5×1–2 cm, short petiolate, bipinnatifid or bipinnatisect, segments decurrent, apex 5-lobed, lobes oblong, lateral segments lanceolate, apex acuminate, glabrate on both surfaces; middle cauline leaves oblong, 2–2.8×1–1.2 cm, base semiamplexicaul, bipinnatisect, glabrate on both surfaces; upper leaves gradually smaller, pinnatisect.
• Heads ca. 5 mm in diam., solitary, terminal; peduncle filiform. Involucre short cupiform, 6 mm across, bracts 2-seriate, equal, oblong, obtuse to acute, margins scarious; receptacle nearly flat, tubercled. Outer florets 1–1.5 mm long; corolla none. Central florets: corolla tubular, 0.8 mm long, 4-dentate.
• Achenes narrowly elliptic, ca. 1×0.4 mm, glandular punctate, narrowly winged.

分布

• 台灣 : in open fields in the north, rarely collected.
• 世界 : Africa, India and mainland China.

引證標本

ILAN: Tungshanho Resort Area, Peng 15273.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 920. 1998.  (Fl. Taiwan 2nd edit.)