ANACARDIACE^. 73 



the lateral ones oblong, acute, 3 4 in. long, the terminal largest and 

 3 5 lobed, or coarsely serrate : fl. of sterile tree umbellately clustered, 

 the pedicels long and capillary, those of the fertile in drooping racemes : 

 fruit pubescent 11^ in. long, including the nearly erect wings. In 

 the Coast Eanges from San Luis Obispo northward. 



2. HIPPOCASTANUM, Town. (BUCKEYE. HORSE-CHESTNUT). Trees 

 with opposite palmately compound exstipulate leaves, and a large 

 thyrsoid inflorescence, the flowers on jointed pedicels. Flowers poly- 

 gamous. Calyx tubular, unequally 5-toothed. Petals 4 or 5, unguicu- 

 late. Stamens 58, exserted, often unequal. Ovary 3-celled: ovules 2 

 in each cell, 1 abortive. Fruit a large coriaceous 3-valved capsule. 

 Seed very large; testa chestnut-brown, showing a large white hilum. 

 Cotyledons large, fleshy, somewhat coherent. 



1. H. Calif or nicum (Spach). A low spreading tree, glabrous, except 

 the petiolules and inflorescence which are minutely pubescent : leaflets 5, 

 on distinct stalklets, oblong or elliptic-oblong, mostly rounded at base, 

 acute or acuminate at apex, serrulate, 35 in. long: thyrsus cylindrical, 

 often 1 ft. long: calyx 2-lobed, the lobes scarcely toothed: corolla white 

 with a faint tinge of rose, ^ in. long: stamens 5 7, long-exserted : fruit 

 smooth, usually 1-seeded: seed 1 in. thick. Tree often 25 or 30 ft. high, 

 the rounded or depressed head of still greater breadth : very common 

 throughout middle California. Admirable specimens are seen at Shell 

 Mound, and on Point Isabel. Fl. May : f r. November. 



ORDER XXVII. ANACARDIACE/E, 



Shrubs or trees with resinous and often acrid juice, alternate exstipu- 

 late leaves, and small variously clustered regular flowers. Stamens 

 definite in number, as many or twice as many as the petals. Pistil 1 : 

 ovary free from the calyx. Fruit drupaceous. 



1. KHUS, Theophr. Ours deciduous shrubs with trifoliolate leaves 

 and small perfect or unisexual flowers in axillary bracted panicles or 

 spikes. Sepals and petals usually 5. Stamens inserted under the edge 

 of a disk lining the base of the calyx. Pistil 1; styles 3, distinct or 

 united. Fruit a small compressed drupe with thin flesh and ligneous 

 putamen. Seed erect; albumen 0. 



* Flowers greenish, in small axillary panicles, appearing with the leaves; 

 drupe white; putamen striate. 



1. R. diversiloba, Torr. & Gray. Erect and 36 ft. high, or ascend- 

 ing trees by aerial roots to the height of 15 ft. or more: leaflets ovate, 

 obovate or elliptical, 1 4 in. long, variously lobed or toothed, the inden- 

 tations obtuse, or the leaflet rarely entire: panicles short-peduncled, 



