200 ROSACEAE. 



which appear with the branchlets from the same buds; calyx 

 turbinate-campanulate, 5-lobed, deciduous; petals 5, broadly 

 spatulate , erect; stamens 15, in two rows; styles short, lateral; 

 carpels 5, on the base of the calyx-tube, free, glabrous; fruit 

 consisting of 1-4 oblong-ovoid 1-seeded drupes, with thin pulp 

 and a smooth bony stone. 



Osmaronia cerasiformis (T. & G.) Greene. Indian Plum. Shrub, 2-4 

 m. high; leaves broadly oblanceolate, acute, 5-10 cm. long, glabrous, entire; 

 racemes nodding; petals white, spatulate; drupes purple-black, oblong. 



In wet soil, common. The young leaves and flowers have a peculiar rather 

 unpleasant odor. The fruits are somewhat bitter. 



264. AMELANCHIER. Service Berry. 



Shrubs or small trees, not thorny; leaves alternate, simple, 

 petioled, serrate or entire; flowers white, in racemes; calyx- tube 

 campanulate, 5-lobed, more or less adherent to the ovary; petals 

 5; stamens numerous, on the calyx- tube; styles 2-5, united below 

 or distinct; ovary 5-celled, each cell 2-ovuled; berry-like pome 

 10-celled, by the growth of a false partition in each cell of the 

 ovary; ovules 10. 



Amelanchier florida Lindl. Shrub or small tree, 2-5 m. high; leaves 

 broadly oblong, rounded or subcordate at base, obtuse, tomentose when 

 young especially beneath, glabrate, toothed above the middle or rarely entire, 

 2-4 cm. long; petioles pubescent, 1-2 cm. long; racemes 4-8 cm. long; calyx 

 pubescent, the triangular acute lobes not longer than the tube; petals ob- 

 lanceolate, obtuse, about 1 cm. long. 



In open woods, common. 



[265. CRATAEGUS. Thorn. Hawthorn. 



Shrubs or small trees, mostly thorny; leaves alternate, petioled, 

 entire, serrate, lobed or pinnatifid; flowers white, rarely rose- 

 colored, in terminal corymbs; calyx-tube cup-shaped or cam- 

 panulate, adherent to the carpels, the limb 5-lobed; petals 5, 

 roundish, on the calyx- tube; stamens many, or only 5 or 10; 

 styles 1-5, separate; ovary inferior, or its summit free; ovules 

 one to each carpel; pome small, drupe-like, with 1-5 bony 

 carpels, each 1-seeded. 



Crataegus douglasii Lindl. {C.brevispina (Dougl.) Heller.) Shrub, 2-6 m. 

 high; spines stout, 2-3 cm. long; leaves obovate, broadly cuneate at base, 

 coarsely doubly dentate above the middle, acute or obtuse, sparsely pubescent 

 on both sides when young, paler beneath, 2-5 cm. long; petioles short, gland- 

 less; corymbs usually many-flowered; flowers about 12 mm. broad; calyx-tube 

 glabrous, the lanceolate lobes pubescent; anthers pink; fruit black, smooth; 

 nutlets with cavities on the ventral faces. 



Along streams and rivers, not common west of the Cascade Mountains. 



266. PYRUS. 



Trees or shrubs ; leaves simple or compound ; flowers in corymbed 

 cymes; calyx urn-shaped, 5-cleft; petals roundish or obovate; 



