特徵描述
作者
YANG, YUEN-PO and LU, SHENG-YOU
型態特徵
Deciduous, monoecious trees (in Taiwan). Leaves alternate, pinnate, estipulate. Staminate inflore-scences solitary catkins or clusters of 3 or more catkins; staminate flowers in axil of a bract, with or without 2 bracteoles; perianth 0 or of 3-6 scales on the margins of bracts, epigynous; stamens 3-40, on bracts, filaments short, anthers basifixed, 2-locular, dehiscing longitudinally. Pistillate inflorescences many-flowered catkins or 2- several-flowered spikes; pistillate flowers bracteate; perianth 4-parted or none, fused with ovary; ovary bicarpellate, rarely of 3 or 4 carpels, inferior, 1-locular, style 2-bifid, stigmatic branches 2-4; ovule 1, erect, orthotropous. Fruit a nut or a drupe or a 2-, 3- or circular-winged samara; seeds basifixed, solitary, without endosperm, cotyledons 4-lobed, often fleshy.
屬
Genera nine, species about 60, primarily temperate and subtropical regions of northern hemisphere; three genera in Taiwan.
參考文獻
Juglans 胡桃屬
作者
YANG, YUEN-PO and LU, SHENG-YOU
型態特徵
Deciduous trees; pith chambered; buds several-scaled. Leaves alternate, odd-pinnate; leaflets serrate or entire. Staminate inflorescence lateral on old growth, pendulous; male flowers with 1 bract and 2 bracteoles. Pistillate inflorescence terminal on branches of the present year, many-flowered; pistillate flowers with 1 bract and 2 bracteoles fused to ovary; perianth 4-parted, fused to ovary at lower part; ovary inferior, 2-carpellate; stigmas 2, carinate. Fruits drupe-like, husk usually indehiscent.
