21. Grayia Hook. et Arn.

Grayia Hook. et Arn., Bot. Beechey's Voyage: 387 (1840)

Shrubs, sometimes spinous, dioecious or monoecious. Staminate flowers in axillary clusters, perianth 4-5-lobed; stamens 4-5, inserted on a disk, pistillate flowers in raceme-like intlorescences; bracteoles 2, folded, connate, keeled, later enlarged and winged; stigmas 2. Pericarp free; seeds vertical; embryo annular; radicle pointing downward. Zn =36. Two spp., Western N America.