172 MANN, 



1. PERROTTETIA HBK. 



Flowers polygamo-dioecious. Calyx 5-parted. Petals 5, triangular- 

 ovate, short, valvate or with the margins imbricated. Stamens in the 

 sterile flowers longer than the petals. Ovary free, 2-celled; style 

 short or elongated ; stigma bifld. Ovules 2 in each cell, erect. Berry 

 small, depressed-globular, 2-celled, 2-4-seeded. Seeds exarillate, 

 obovoid, the testa horny and many-ribbed. Embryo very small, in the 

 base of fleshy albumen. Unarmed shrubs, or small trees. Leaves 

 alternate, petiolate, glandular-serrate. Stipules deciduous. The thyrs- 

 oid panicles axillary. 



A genus of four species, from New Grenada, Mexico, and the Hawaiian Islands. 



1. P. SANDWICENSIS Gray. (Enum. No. 84.) A small tree 20 

 high, more or less ; the younger branchlets and lower surface of the 

 unfolding leaves more or less pubescent; otherwise nearly glabrous. 

 Leaves ovate-oblong, abruptly acuminate, pale beneath, 2'-3i'long, 

 on petioles '-!' long. Flowers (l" in diam.) greenish, pedicellate, 

 very numerous, in panicles mostly shorter than the leaves, on a puber- 

 ulent peduncle. Calyx-lobes ovate-lanceolate, acute, slightly puberu- 

 lent. Petals scarcely exceeding the calyx, their thin margins ciliate. 

 Stamens 5. Ovary in the male flowers abortive. 



Mountains behind Honolulu, on the edge of the woods usually. West Maul, Hawaii , 

 andKauai: not uncommon. 



ORDER XXI. RHAMNACE^. 



Shrubs or trees, with usually alternate simple leaves, and small 

 flowers. Calyx of four or five sepals, united at the base, valvate in 

 aestivation. Petals four or five, cucullate or convolute, inserted on 

 the throat of the calyx. Stamens as many as the petals, inserted with 

 and opposite them. Ovary sometimes coherent with the tube of the 

 calyx, and more or less immersed in a fleshy disk, with a single erect 

 ovule in each cell. Seeds sometimes arilled. Embryo straight, large, 

 in sparing albumen. Jujube paste is prepared from the berries of 

 Zizyphus Jujuba and Z. milgaris of Asia. Z. Lotus is the Lote-bush 

 which gave name to the ancient Lotophagi. 



Flowers hermaphrodite. Base of calyx-lobes surrounding the fruit 

 as a ring (i. e., the ovary only partly inferior), not winged 

 or ribbed. 



Drupe with a hard cartilaginous exocarp. Leaves mostly or en- 

 tirely smooth, 1. COLUBBINA. 



Drupe with a dry, mealy, or corky exocarp. Leaves and cymes 



more or less rusty downy, 2. ALPHITONIA. 



Flowers polygamous. Fruit crowned by the persistent calyx (i. e., 



ovary entirely inferior), winged or ribbed, 3. GOUANIA. 



