Circaea 露珠草屬
型態特徵
Perennial rhizomatous herbs, often forming large colonies. Leaves petiolate, opposite, becoming alternate and bract-like in inflorescence. Inflorescence terminal on main stem and at tips of short axillary branches, a simple or branched raceme. Flowers white or pink, 2-merous, with a floral tube; ovary uni- or bilocular; ovules 1 per locule; sepals and petals alternate, stamens opposite sepals; petals notched at apex; nectary surrounding base of style, wholly within floral tube or elongated and projecting as a fleshy, cylindrical or ring-like disc; style equalling or longer than stamens, stigma 2-lobed. Fruit an indehiscent capsule, covered with stiff uncinate hairs; with or without conspicuous rows of corky tissue. Seeds smooth, fusiform or broadly clavoid to slenderly ovoid, adhering firmly to inner ovary wall. n=11.
A genus of 7 species and an additional 7 subspecies in temperate and boreal forests of the northern hemisphere from near sea level to 5,000 m, and from 10 to 70 N. Lat; 4 species are in Taiwan. Interspecific hybrids are common and often abundant in naturally disturbed habitats in North America, Europe and Japan, but are unknown from Taiwan.
