i I 



ROSE FAMILY 445 



^ 



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

 copses: N.M.— Colo. Son.—SubmonL 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. 

 ^ood^ii b. Wats., not Lindl. R. grosseserrata E. Nels. R, Maximiliani Rydb., 

 not ^ees. Banks and copses: Sask.— Neb.— w Tex.— N.M.— Utah— e Wash. 

 Flam — SuhmonL My-JL 



\...^i. ^o"rgeauiana X Macounii. This resembles R. Macounii in habit and flowers. 

 ^r« vAp/w^?i®^^5*^ are exceedingly bristly and the leaflets, especially those of the shoots, 

 granuhferons ^m ^^^^^^^' ^^^^ ^^oq,<1 occasionally double teeth, and slightly glandular- 



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- 

 ilterous 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, 

 nnely puberulent and more or less gland ular-gr an uliferous beneath; hypanthium 

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

 iU-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. 

 oubmont. Je-Jl. 



K .??• R- gymnocarpa Nutt. Stem slender, 1-3 m. high, terete, often very 

 bristly and with mfrastipular prickles, which are very slender, terete, sometime's 

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

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

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

 1 ^.o cm. long, thm, shmmg above, dull beneath, glabrous on both sides, double- 

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

 in iruit 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.—SubmonL My-Jl. 



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

 gymnocar-pa. Stem 1 m. high or more, sparmgly bristly, with ascending bristles; 

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

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

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

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

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

 Mont.— B.C. SuhmonL My-Jl. 



Family 61. MALACEAE. Apple Family. 



wi 



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, 



^^'!g^f tlie fruit by false partitions twice as many as the styles, 



l^lowers racemose; styles 3-5. rarely 2. 1. Amelanchier. 



nc^^ f^^^ solitary or in 2- or 3-flowered corymbs; styles 2. 2. Peraphyllum. 



'-eiis or th.e fruit as many as the styles. 



Lieaves pinnately compound; carpels leathery at maturity. 3. Sorbus. 



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



4. Crataegus. 



