ROSE FAMILY. 



285 



in habit and aspect) collected by Bioletti at Byron, Apr. 8, 1892, 

 exhibit on different individuals calyces densely hirsute and calyces 

 perfectly glabrous. 



12. OSMARONIA Greene. 



Shrub with simple entire deciduous leaves .and caducous stipules. 

 Flowers dioecious, white, fragrant, in nodding racemes terminating 

 leafy branchlets. Calyx turbinate-campanulate, 5-lobed, deciduous. 

 Petals erect in the pistillate flower, spreading in the staminate. 

 Stamens of staminate flower 15, in 3 rows, 10 inserted with the 

 petals, 5 inserted lower down upon the disk lining the calyx-tube; 

 stamens of pistillate flower present but abortive. Pistils 5, simple, 

 free and distinct, glabrous; styles short, lateral, jointed at base; 

 ovules 2 to each ovary, pendulous. Fruit consisting of 1 to 4 ovoid 

 drupes with a thin pulp and bony stone. Seed solitary; cotyledons 

 convolute. (Osme, Greek adjective meaning fragrant, and Aronia, a 

 genus founded by Persoon and now referred to Amelanchier.) 



1. O. cerasiformis (T. & G.) Greene. Oso Berry. Three to 

 9 ft. high, the branchlets reddish; leaves glabrous, broadly oblong, 

 narrowed to each end, mucronate, 1^ to 2\ in. long when mature, 

 short- petioled; racemes with conspicuous bracts, several from leafy 

 winter buds, rarely solitary; petals of staminate flower ovate, 3 lin<-> 

 long; petals of pistillate flower spatulate or obovate, 2 lines long; 

 drupes blue-black, 5 to 7 lines long, the pulp bitter. — (Nuttallia 

 cerasiformis T. & G.) 



Frequent in the outer (or seaward) Coast Ranges (Marin Co.. San 

 Francisco, Oakland Hills); rare in the inner Coast Ranges (Mt. 

 Diablo; Tolenas Springs, Solano Co., Piatt). Mar. -Apr., fruiting in 

 July. Scales of the winter buds homologous with blades. 



13. CERASUS L. Cherry. 

 Trees or shrubs. Leaves simple, serrate, conduplicate in the bud. 

 Flowers white, in corymbs or in racemes from lateral buds. Calyx 

 5-cleft, deciduous after flowering. Stamens 15 to 30. Pistil 1; style 

 terminal. Drupe globose, without bloom; flesh in our species sweet 

 or bitter; stone globose, not prominently margined. (Greek kerasos, 

 the cherry tree, the name from Cerasus in Pontus.) 



Leaves deciduous, serrate or serrulate. 

 Flowers in corymbs; leaves commonly with 1 or 2 glands near base of 



blade 1. C. emarginata. 



Flowers in racemes, the peduncle leafy; petiole with 1 or 2 glands below 



the blade 2. V. demissa. 



Leaves evergreen, coriaceous, spinose-toothed; flowers in racemes, the 

 peduncle leafless 3. C. ilicifolia. 



1. C. emarginata Dougl. Red Cherry. Shrub 3 to 8 ft. high, 

 with smooth dull red bark; leaves ovate or more commonly oblong- 

 obovate, mostly obtuse, finely serrulate, £ to 1£ in. long, on petioles 

 1 to 3 lines long; blade with 1 or 2 glands just above junction with 

 petiole; flowers in short corymbs; fruit 4 or 5 lines long, bright red, 

 the pulp intensely bitter. 



