特徵描述
作者
LI, HUI-LIN and YANG, KUOH-CHENG
型態特徵
Trees, shrubs or suffrutescent subshrubs. Leaves opposite or rarely alternate, simple, usually deciduous, petioled, estipulate. Flowers small, bisexual or unisexual, actinomorphic, in cymes or panicles or head, sometimes with showy foliaceous bracts. Sepals 4–5, distinct, valvate. Petals 4(–5) distinct mostly valate. Stamens of same number as petals and alternate with them, distinct; anthers 2-celled, basifixed or dorsifixed. Ovary inferior, 2–4- or rarely 1-celled; placentation usually axile; ovule 1 in each cell, pendulous, anatropous; style 1 or several, arising from an epigynous ring or disc, the stigmas as many as styles and subcapitate. Fruit a drupe, sometimes a berry or rarely a syncarp. Seeds with small embryo in copious endosperm.
屬
About 13 genera, widely distributed in the tropical and temperate regions of the world; four in Taiwan.
參考文獻
Helwingia 青莢葉屬
作者
LI, HUI-LIN and YANG, KUOH-CHENG
型態特徵
Glabrous undershrubs. Leaves petioled, simple, lanceolate or ovate-lanceolate, bristle-serrate; stipule a tuft of linear bristles seen only at the base of the young petioles. Flowers unisexual, very small, in sessile umbels at the middle of the abaxial surface of the leaf or phyllode; pistillate flowers 1–4-flowered; staminate flowers with more flowers; calyx truncate; petals 3–4, valvate; stamens 3–5; ovary 3–4-celled, the style 3–4, combined at the base, arising from a conical disc. Fruit ovoid or ellipsoid, usually 2–3-celled; carpels rounded on the back; seeds compressed; endosperm uniform.
