518 FLORA. 



racemes 4-10- flowered; pedicels 1-2.5 cm - l n g * n fruit ; calyx-lobes nearly tri- 

 angular ; pome about 6 mm. in diameter. N. Y., N. J. and Penn. May. 



4. Amelanchier rotundifolia (Michx.) Roem. ROUND-LEAVED JUNE-BERRY. 

 (I. Tf. f. 1988.) A tall shrub or small tree. Leaves broadly oval, ovate or nearly 

 orbicular, 2-8 cm. long, obtuse or rounded at both ends, or rarely subacute. often 

 cordate at the base, serrate with large teeth, or entire near the base, glabrous from 

 the time of unfolding or more or less woolly when very young ; pedicels 2-4 cm. 

 long in fruit; calyx-lobes lanceolate; petals spatulate or oblanceolate, 1-1.6 cm. 

 long; pome 6-8 mm. in diameter. In woods and thickets, N. B. to Minn., N. Y. 

 and Mich. May. 



5. Amelanchier alnifolia Nutt NORTHWESTERN JUNE OR SERVICE-BERRY. 

 (I. F. f. 1989.) A shrub, tomentose-pubescent when young, at length glabrate and 

 somewhat glaucous. Leaves thick, broadly elliptic or almost orbicular, very ob- 

 tuse and often truncate at the apex, rounded or subcordate at the base, coarsely 

 dentate above the middle, 1-5 cm. long; racemes short, rather dense; pedicels 

 short; petals oblanceolate, cuneate. 6-18 mm. long, 2-4 times the length of the 

 calyx; pome purple, with a bloom, 6-8 mm. high, sweet. Dry soil, western Ont. 

 to Br. Col., Mien., Neb.. N. Mex. and Cal. April. 



6. Amelanchier oligocarpa (Michx.) Roem. OBLONG-FRUITED JUNE-BERRY. 

 (I. F. f. 1990.) A shrub, glabrous or very nearly so, except the early deciduous 

 bracts, which are sometimes tomentose. Leaves thin, narrowly oval or oblong, 

 generally about 3 times as long as broad, narrowed at each end, finely and sharply 

 serrate, 2-8 cm. long; racemes i-4-flowered ; pedicels slender; petals obovate or 

 oblanceolate, 6-8 mm. long, about twice as long as the calyx; pome pear-shaped, 

 purple, with a bloom, 6-8 mm. long. In cold swamps or wet rocky places, Lab. 

 to Ont., Penn. and Mich. May. 



6. CRATAEGUS L. 



Shrubs or small trees, usually spiny, with petioled leaves and white or pink 

 corymbose flowers. Calyx-tube cup- shaped or campanulate, adnate to the carpels, 

 its limb 5-lobed. Petals 5, rounded, inserted on the throat of the calyx. Stamens 



00 . usually numerous ; filaments filiform. Ovary inferior, or its summit free, 

 i-5-celled; styles 1-5, separate; ovule I in each carpel, or if 2, dissimilar. Pome 

 rather small, drupe-like, containing 1-5 bony carpels, each I -seeded or rarely 

 2-seeded. Seed erect, flattish. [Greek, strong, from the toughness of the wood. ] 

 About 75 species, natives of the north temperate zone, Mexico and the Andes. 

 Besides the following, 8 or 10 others occur in southern and western N. Am. 



* Corymbs many-flowered. 



1. Leaves obovate, spatulate, oblanceolate or flabellate. 



Foliage, pedicels and calyx glabrous. 



Leaves obovate or oblanceolate, sharply serrate. 



Spines long, slender; leaves shining. I. C. Crus-galli. 



Spines short, stout; leaves dull. 2. C. brevispina. 



Leaves obovate or spatulate, crenate. 



Leaves narrowly spatulate ; flowers 8 mm. wide. 3. C. spathulata. 



Leaves obovate; flowers 15 mm. wide. 4. C. Brownii. 



Lower leaf -surf aces, pedicels and calyx more or less pubescent, at least when young. 

 Leaves short-petioled; fruit smarl. 



Leaves oblanceolate, very obtuse. 5. C. berberifolia. 



Leaves obovate-oval, acutish. 6. C. prunifolia. 



Leaves obovate, acutish, dull. 7. C. collina. 



Leaves slender-petioled ; fruit large. 



Leaves obovate, dull, irregularly serrate. 8. C. punctata. 



Leaves flabellate, shining, incised-serrate. 9. C.flabellata. 



2. Leaves ovate, oval, orbicular-obovate or nearly orbicular. 



a. Foliage, pedicels and calyx glabrous, or nearly so. 

 Leaves mainly truncate or cordate at the base. 



Leaves lobed ; fruit 4-6 mm. high. 10. C. cordata. 



Leaves irregularly serrate ; fruit 10-12 mm. high, glaucous. 



n. C. Eggerti. 

 Leaves narrowed or wedge-shaped at the base. 



Leaves deeply cleft ; styles 1-3. 12. C. Oxyacantha. 



Leaves serrate or incised ; styles mostly 5. 



Fruit about 6 mm. in diameter. 13. C. viridis. 



