特徵描述
作者
KAO, MUH-TSUEN
型態特徵
Perennial or annual herbs, rarely suffrutescent, caulescent or acaulescent; roots often thick,tuberous or fusiform; stems erect or creeping, usually fistulose or solid. Leaves alternate, simple or prominently divided and compound, the upper petioles frequently embracing young inflorescence with a dilated sheath-like base. Flowers yellow, white, pink, purplish or violet, bisexual or polygamous, in simple or compound umbels, sometimes capitate; calyx 5-toothed; petals 5, valvate or slightly imbricate in bud, free, deciduous, often incurved at apex; stamens 5, alternate with petals. the filaments filiform, incurved in bud; ovary inferior, bilocular; styles 2, often accrescent, usually with stylopodium; ovules solitary in each cell, pendulous. Fruit a schizocarp, bilocular, separating into 2 carpels (mericarps), these usually suspended from the top of the central column called carpophore, with 5 primary ribs and sometimes 4 intermediate or secondary ones; vittae (oil-tubes) often present; seeds with abundant endosperm and a small embryo.
屬
About 200 genera and 3,000 species distributed in the whole world. sixteen genera, about 29 species and two varieties in Taiwan.
參考文獻
- KAO, MUH-TSUEN, Flora of Taiwan, second edition 3: 1010. . (Fl. Taiwan 2nd edit.)
- Hiroe, M., 1-219. 1958.
- Ohwi, J., 667-686. 1965.
- Walker, E. H., Fl. Okinawa and southern Ryukyu Is. 789-799. 1976.
Centella 雷公根屬
作者
KAO, MUH-TSUEN
型態特徵
Perennial herbs, prostrate, glabrous or pubescent, rooting at the nodes; stipules absent. Leaves simple, long petiolate, entire to crenate or palmately lobed. Umbels solitary or fascicled; peduncles axillary, rather few flowered, rarely 1-flowered; involucre of 2–3 conspicuous bracts. Flowers white or rose-tinged; calyx-teeth obsolete; petals narrow, inflexed at apex. Fruit orbicular to ellipsoid, reniform, the secondary ribs as distinct as the primary; carpophore entire, very short. Vittae none or occasionally containintg small vittae. Seeds laterally compressed.
