Platycarya 化香樹屬

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

YANG, YUEN-PO and LU, SHENG-YOU, Flora of Taiwan, second edition 2: 23. 1996. (Fl. Taiwan 2nd edit.)

Platycarya 化香樹屬

作者

YANG, YUEN-PO and LU, SHENG-YOU

型態特徵

Deciduous trees; pith solid; buds with scales. Leaves alternate, odd pinnate, serrate. Inflorescences catkins, erect, terminal on main branch or upper short lateral branches, or combined in androgynous corymbs. Staminate flowers with an unlobed bract, without bracteoles and perianth; stamens 4 or 5 on the bract and 3 or 4 on rachis of inflorescence. Pistillate flowers with a stiff unlobed bract, bracteoles 2, adnate to ovary; perainth segments 2, fused with bracteoles; ovary 1-celled; stigmas 2, carinate. Frutescence cone-like, erect, with persistent bracts; fruit a small flattened nutlet, with 2 small wings.

One species in Japan, Korea, mainland China, Taiwan and Vietnam.