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24. Nyssaceae

蓝果树科 lan guo shu ke

Authors: Haining Qin & Chamlong Phengklai

Trees or shrubs, dioecious or polygamo-monoecious. Leaves alternate, simple, estipulate. Flowers 5-merous, ± regular, subtended by 1-5 bracts; male ones in heads, racemes, or umbels; female and hermaphroditic ones solitary or in 2-12-flowered heads. Calyx tube adnate to ovary in bisexual or female flowers; lobes small or obsolete. Petals usually 5-10 (or absent). Stamens in male flowers usually 10 or more in 2 ± distinct whorls around a nectariferous disk. Ovary inferior, 1-8-loculed, with 1 pendulous, apotropous ovule per locule. Fruit a drupe; each locule of stone opening at apical part by a ± triangular abaxial valve at germination. Seeds 1-5; embryo straight; endosperm copious.

Five genera and about 30 species: mostly in temperate regions of E Asia and E North America; three genera (two endemic) and ten species (eight endemic) in China.

Recent studies suggest that this family can alternatively be treated as part of the Cornaceae (Xiang et al., Amer. J. Bot. 85: 285-297. 1998).

Fang Wen-pei. 1983. Nyssaceae. In: Fang Wen-pei & Chang Che-yung, eds., Fl. Reipubl. Popularis Sin. 52(2): 144-159.


1 Fruit samaralike, clustered in globose heads.   1 Camptotheca
+ Fruit a drupe, solitary or several in a cluster   (2)
       
2 (1) Drupe 3-4 cm, 1.5-2 cm in diam., usually solitary; ovary 6-10-loculed; bracts white, 7-16 × 3-5 cm, larger one pendulous.   2 Davidia
+ Drupe to 2 cm, to 1 cm in diam., usually several in a cluster; ovary 1- or 2-loculed; bracts yellowish or greenish, smaller than above.   3 Nyssa

Lower Taxa


 

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