特徵描述
作者
HSIEH, CHANG-FU, CHAW, SHU-MIAW and WANG, JENN-CHE
型態特徵
Herbs, shrubs, or trees, often with milky juice, sometimes fleshy and cactus-like. Leaves alternate or rarely opposite, simple or variously compound, mostly stipulate. Flowers monoecious or sometimes dioecious, mostly actinomorphic, variously disposed, with or without perianth, sometimes with a corolla; perianth valvate or imbricate; sepals and petals usually distinct; disc often present, annular or of separate glands. Staminate flowers variable, with stamens usually as many or twice as many as the petals or reduced to one, distinct or mona-delphous; anthers mostly 2-celled. Pistillate flowers with or without staminodes, often pedicellate; ovary superior, consisting of 3 or sometimes 2, or more than 3, united, 1-celled or rarely 2-celled carpels; styles 3, distinct or basally connate, each often 2-lobed; stigmas 3 or 6; placentation axile; ovules one or less commonly 2, pendulous. Fruit usually a schizocarpous capsule splitting often elastically into three 1-seeded cocci that dehisce ventrally, sometimes a drupe; seeds often with a conspicuous caruncle; endosperm mostly copious, fleshy; embryo straight.
屬
A very large family containing about 300 genera and 8,000 species, mostly tropical and subtropical; 27 genera in Taiwan.
參考文獻
Gelonium 白樹屬
作者
HSIEH, CHANG-FU, CHAW, SHU-MIAW and WANG, JENN-CHE
型態特徵
Shrubs or small trees; branches with stipular scars at the nodes. Leaves alternate, rarely opposite, pellucid-punctate, entire or serrate; stipules connate, sheathing. Flowers small, white, in axillary clusters, sessile or peduncled, often leaf-opposed, apetalous. Male flowers: sepals 5, orbicular, imbricate; stamens 10–60, on a convex receptacle, the filaments filiform, the anthers oblong, dor¬sifixed; pistillode 0. Female flowers: sepals 5 or 6, narrower than in the males; disc cupular; ovary 2- to 4-celled; styles minute, reniform, crescentic or bifid. Fruit globose, 3- to 4-angled or lobed, more or less fleshy, dehiscing at length; seeds arillate.
