prunus. AMYGDALACE.E. 161 



CERASUS. 



1. Prunus. Flowers perfect: carpel solitary: leaves convolute in the 

 bud. 



2> Cerasus. Flowers perfect: carpel solitary: leaves conduplicate in 

 the bud. 



3. Osmaroma. Flowers polygamo-dioecious: carpels 5, becoming 5 

 drupes, or by abortion fewer or none. 



1 PRUNUS Juss. Gen. 341. (Plum. Prune). 



Leaves convolute in the bud. Flowers in umbellate clusters 

 from lateral buds, appearing before or with the leaves. Drupe 

 ovoid, glabrous and glaucous ; the thick sarcocarp pulpy. Put- 

 a'men (stone) bony, smooth, compressed, acutely edged on one 

 margin, grooved on the other. 



P. subcordata Benth. PI. Hartw. 308 (?). A much branched shrub, 3- 

 12 feet high, with ashy-gray bark: young branches and leaves finely pu- 

 bescent, becoming glabrous: stipules narrowly-lanceolate, laciniate-den- 

 tate, 1-2 lines long; leaves elliptical to ovate, cordate to cuneate at base, 

 obtuse or acute, sharply and finely serrulate, about an inch long, short- 

 petioled: umbel 2-4-flowered; pedicels 3-6 lines long; calyx campanulate, 

 the oblong obtuse minutely dentate lobes about as long as the tube; petals 

 white, obovate, rounded at the apex, 4--5 lines long by 2-3 lines broad : 

 fruit 8-10 lines long, oblong, subacid. On dry rocky hills and open woods, 

 Umpqua valley, Oregon, to California. 



P. Oregana Greene Pitt, iii, 21. "Evidently allied to P. snbcord- 

 ata, but leaves little more than an inch long, subcoriaceous, pubescent on 

 both faces, in outline oval or broadly elliptic, never subcordate, commonly 

 acutish at both ends, serrulate : flowers unknown : fruits in pairs or 

 threes, on pedicels 6 lines long or more, densely tomentose when very 

 young, more thinly so, yet distinctly tomentulose when half-grown. 

 Known only from specimens collected on the Yainax Indian reservation 

 in southeastern Oregon, by Mrs. Austin, in 1893. * * * " 



2 CERASUS Juss. gen. 340. (Cherry.) 

 Trees or shrubs with alternate simple leaves that are condupli- 

 cate in the bud and corymbose or racemose flowers from lateral 

 buds, appearing before or with the leaves. Calyx campanulate, 

 deciduous, the limb 5-parted, regular. Petals 5, spreading. 

 Stamens 15-30. Ovary solitary, 1 -celled, with two collateral 

 pendulous ovules. Drupe globose, fleshy, destitute of bloom ; 

 stone mostly globose, smooth, not prominently margined. 



§ 1. Eucerasus T. & G. Fl. i, 409. Flowers from lateral leaf- 

 less buds, appearing before or with the leaves ; pedicels umbel- 

 late-fascicled, corymbose, or racemose. 



C. eniargiiiata Dougl. Hook. Fl. i, 169. Prunus emarginata Walp. 

 Shrub 3-12 feet high, diffusely branched from the base and clothed through- 

 out with a smooth shining bark: leaves oblong- obovate to oblanceolate, 

 mostly obtuse, rarely emarginate, crenately serrulate, 1-3 inches long, 

 with a single or a pair of glands at or above the junction of the petiole 

 and blade, pubescent beneath, nearly smooth or puberulent above: inflor- 

 escence pubescent; racemes few-flowered: calyx campanulate, the oblong 

 obtuse lobes soon reflexed, scarcely equalling the tube, about a line long; 

 petals orbicular-ovate, 2 lines long, minutely pubescent outside : drupe 3-4 

 lines in diameter, dark-red, intensely bitter and astringent. Common in 

 mountainous districts, Brit. Columbia to California, east of the Cascade 

 Mountains. 



