ROSE FAMILY 445 



broadly obcordate. R. aciculata Rydb. (Fl. Colo.), not Cockerell. Banks and 

 copses: N.M. Colo. Son, Submoni. Je. 



27. R. Macounii Greene. Stem 0.5-2 m. high, usually armed with straight 

 terete prickles, 5-8 mm. long; new shoots bristly; stipules entire or glandular- 

 denticulate, puberulent on the back; rachis and petiole finely puberulent, un- 

 armed; leaflets obovate, serrate, 1-3 cm. long, green and glabrous above, pale or 

 glaucous, finely puberulent ana sometimes pruinose beneath; hypanthium glo- 

 bose, without a neck, glabrous, 8-10 mm. thick; sepals glabrous or sparingly 

 pubescent on the back; petals about 2 cm. long, obcordate, rose-colored. R. 

 Woodsii S. Wats., not Lindl. R. grosseserrata E. Nels. R. Maximiliani Rydb., 

 not Nees. Banks and copses: Sask. Neb. w Tex. N.M. Utah e Wash. 

 Plain Submont. My-Jl. 



R. Bourgeauiana X Macounii. This resembles R. Macounii in habit and flowers, 

 but the young shoots are exceedingly bristly and the leaflets, especially those of the shoots, 

 are very broad and rounded, with broad occasionally double teeth, and slightly glandular- 

 granuliferous. Mont. 



28. R. pyrifera Rydb. Stem 1 m. high or more, armed with slender, straight 

 prickles 5-8 mm. long; stipules finely puberalent and usually glandular-granu- 

 ilferous on the back; petiole and rachis puberulent and often glandular; leaflets 

 about 7, oval, 2-4 cm. long, coarsely serrate, dark green and glabrous above, 

 finely puberulent and more or less glandular-gran uliferous beneath; hypanthium 

 pyriform or ellipsoid, acute at the base, with a distinct neck at the apex, in fruit 

 10-12 mm. thick and 15-20 mm. long; sepals glandular on the back; petals ob- 

 cordate, about 2 cm. long. Banks: Mont. Wyo. Utah Calif. Wash. 

 Submont. Je-Jl. 



29. R. gymnocarpa Nutt. Stem slender, 1-3 m. high, terete, often very 

 bristly and with infrastipular prickles, which are very slender, terete, sometimes 

 not larger than the scattered bristles, sometimes 1 cm. long; stipules glabrous 

 on the back, glandular-ciliate and dentate on the margin; rachis and petiole 

 usually glandular-hispid; leaflets 5-7 (rarely 9), from suborbicular to elliptic, 

 1-3.5 cm. long, thin, shining above, dull beneath, glabrous on both sides, double- 

 serrate, with gland-tipped teeth; flowers usually solitary; hypanthium ellipsoid, 

 in fruit 7-9 mm. thick, 8-10 mm. long; sepals 5-8 mm., sometimes 10 mm. long, 

 purplish, glabrous on the back; petals 10-18 mm. long, obcordate. Woods: 

 B.C. Mont. Ida. Calif. Son. Submont. My-Jl. 



30. R. leucopsis Greene. Closely related and scarcely distinct from R. 

 gymnocarpa. Stem 1 m. high or more, sparingly bristly, with ascending bristles; 

 stipules glandular-ciliate and glandular on the back; petiole and rachis glandular- 

 hispid; leaflets oval or obovate, deeply double-serrate, with gland-tipped teeth, 

 glabrous on both sides, pale; flowers solitary; hypanthium glabrous, ellipsoid, 

 becoming globose or pear-shaped in fruit, 4-6 mm. thick; sepals glabrous on the 

 back; petals obcordate, 10-12 mm. long. Woods and copses: Ore. Ida. 

 Mont. B.C. Submont. My-Jl. 



FAMILY 61. MALACEAE. APPLE FAMILY. 



Trees or shrubs, with simple or pinnate, alternate leaves, with stipules. 

 Flowers perfect, regular. Hypanthium well developed, adnate to the ovary, 

 becoming fleshy, and constituting a part of the fruit. Sepals and petals 

 mostly 5. Stamens numerous, distinct, inserted on the margins of the re- 

 ceptacle. Gynoecium of 1-5 united carpels; cells of the ovary and styles 

 as many, the latter distinct or partly united. Fruit a more or less fleshy 

 pome. 



Cells of the fruit by false partitions twice as many as the styles. 



Flowers racemose; styles 3-5, rarely 2. 1. AMELANCHIER. 



Flowers solitary or in 2- or 3-flowered corymbs; styles 2. 2. PERAPHYLLUM. 



Cells of the fruit as many as the styles. 



Leaves pinnately compound; carpels leathery at maturity. 3. SORBUS. 



Leaves simple, more or less pinnately lobed; carpels bony at maturity 



4. CRATAEGUS. 



