特徵描述
作者
PENG, Ching-I, CHUNG, Kuo-Fang & LI, Hui-Lin
型態特徵
Herbs or shrubs, rarely trees, sap sometimes milky. Leaves alternate or opposite, rarely whorled, simple or pinnately lobed or divided, estipulate. Flowers 1 to many, arranged in heads, heads solitary or variously arranged into synflorescences. Receptacle variously shaped, either glabrous, setose, or paleaceous, subtended by an involucre of one or more series of bracts (phyllaries). Florets bisexual or unisexual, occasionally neutral. Calyx represented by a pappus of diverse forms or seemingly absent. Corolla gamopetalous, tubular or discoid with 4 or 5 equal teeth or lobes or 2–5 lobes fused and elongate and forming a 2–5 toothed limb or ligule, or corolla bilabiate. Stamens 5, epipetalous, filaments distinct, anthers introrse, connate and forming a tube around style, apex usually appendaged, base often caudate or sagittate. Pistil 1, ovary inferior, 1-celled; style simple, slender, usually bifid; ovule solitary, anatropous. Fruit an achene, often crowned with a setose, paleaceous, or plumose pappus. Endosperm absent.
屬
One of the largest families of flowering plants comprising about 1,535 genera and about 23,000 species, cosmopolitan. About 84 genera and 221 species, plus 20 additional infraspecific taxa in Taiwan.
參考文獻
- PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 807. 1998. (Fl. Taiwan 2nd edit.)
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- Cronquist, S, Vascular Flora of the Southern United States. University of North Carolina Press, Chapel Hill 1: 3-261. 1980.
- Hoffmann, O, Die natürlichen Pflanzenfamilien. IV 5: 87-391. 1894.
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Hemistepta 泥胡菜屬
作者
PENG, Ching-I, CHUNG, Kuo-Fang & LI, Hui-Lin
型態特徵
Biennial herbs; stems erect, branched. Leaves alternate, lyrate-pinnatifid, lower surface densely whitish tomentose, radical leaves sessile, cauline leaves petiolate. Heads many, discoid, homogamous, long peduncled, in large open panicles of corymbs. Involucre ovoid, bracts in many series, imbricate, outer ones with a keeled appendage abaxially, inner bracts much narrower. Receptacle nearly flat, long setose. Flowers bisexual, fertile, long tubular, purplish. Anthers sagittate at base, tails short, fimbriate. Style branches rounded-truncate, granular-tuberculate at tip, tuberculate on back, becoming recurved. Achenes oblong or obovoid, 10–15-ribbed, glabrous. Pappus bristles 2-seriate, outer ones shorter, few, persistent, rather broad, inner ones more slender, white, deciduous.
