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23. Buxaceae

黄杨科 huang yang ke

Authors: Tianlu Min & Paul Brückner

Shrubs, small trees, rarely subshrubs or perennial herbs, evergreen, monoecious or rarely dioecious. Leaves simple, alternate or opposite, exstipulate, margin entire or dentate, venation pinnate or triplinerved. Inflorescences axillary or terminal, racemose or densely spicate, bracteate. Flowers small, regular, unisexual. Male flowers: tepals 4-6 or rarely absent; stamens 4, 6-8, or numerous; central pistillode present or lacking. Female flowers: tepals 5 or 6 or several; carpels 2 or 3; ovary superior, 2- or 3-locular; styles 2 or 3, free, persistent; stigma broadly recurved; interstylar nectaries present or lacking; ovules 2 per locule, pendent, anatropous, bitegmic, crassinucellar; micropyle formed by inner integument or by both integuments. Fruit a loculicidal dry capsule or a fleshy berry. Seeds black, shining; endosperm fleshy; embryo erect; cotyledons thin or plump.

Four or five genera and ca. 70 species: Africa, America, Asia, Europe; three genera and 28 species (21 endemic) in China.

Based on recent molecular data, the South American genus Styloceras Kunth ex A. Jussieu is included within the Buxaceae, and the African Notobuxus Oliver is included within Buxus.

Cheng Mien. 1980. Buxaceae. In: Cheng Mien & Ming Tien lu, eds., Fl. Reipubl. Popularis Sin. 45(1): 16-60.


1 Leaves opposite, margin entire, venation pinnate; female flower solitary, apical on inflorescence; fruit a loculicidal capsule.   1 Buxus
+ Leaves alternate, usually triplinerved; female flower in basal part of inflorescence; fruit a berry, ± fleshy   (2)
       
2 (1) Leaf margin entire; persistent style very short in fruit state, ca. 2 mm.   2 Sarcococca
+ Leaf margin apically dentate; persistent style prismatic, elongated in fruit state, 8-15 mm.   3 Pachysandra

Lower Taxa


 

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