434 ROSACEAE 



obovate to elliptic, 1.5-2 cm. long, obtuse; pistils numerous; styles in fruit 3-4 



cm. long. Hills and canons: Tex.— Colo.— Utah— Ariz.; n Mex. Son.— Mont. 

 Ap-Au. 



30. COWANIA D. Don. Cliff Rose. 



Shrubs or small trees. Leaves alternate, toothed or pinnatifid, or entire, 



coriaceous, glandular-dotted, mostly with revolute margins and tomentuloae 



beneath. Flowers sohtary, terminal, on short branches. Hypanthium wholly 



persistent, more or less turbinate. Sepals 5, imbricate, persistent. Petals 5, 



obovate, spreading. Stamens numerous in two series, inserted in the throat of 



the hypanthium. Pistils 4-12, or in one species only 1-3, distinct, sessile, 



densely yiUous-hirsute; style terminal, plumose, persistent, elongate in fruit: 

 ovules sohtary. 



1. C. Stansburiana Torr. A shrub 1-3.5 m. high; bark of the stem gray 

 and shreddy, tliat of the young branchlets reddish-brown and glandular; leaves 

 obovate m outhne, 8-15 mm. long, glandular-punctate and green above, more or 

 less tomentulose beneath, revolute-margined, pinnately 3-5-divided; flowers 

 sontary, terminal; hypanthium turbinate-f unnelf orm ; petals sulphur-yullow or 



cream-coiored, broadly obovate, 8-10 mm. long. C. mexicana A. Gray, not D. 

 Don. Dry hills: N.M.-s Colo.-Nev.-s Cahf.; n Mex. Son.^Submout. 



My-N. 



31. PURSHIA DC. 



Shrubs with spreading branches. Leaves alternate, crowded, apparently 

 fascicled, deeply 3-cleft, with revolute margins. Flowers sohtary, terminating 

 short branches Hj-panthium turbinate or funnelform, persistent. Sepals 5. 

 imbricate Petals 5, yellow. Stamens about 25, in one series, inserted on the 



Xlfr..t:}'^,^?T^^'u'\ /'^*'^^ ^' ^^'■'^ly 2, lance-oblong, tapering into a 

 short per.isterit style, which does not greatly elongate in fruit; ovule solitary, 

 basal, erect. [A wneia Spreng.] > j> 



or.ii: u' ^"'l^^***^ (Pursh) DC. Shrub 1-3 m. high; bark chestnut-brown or 

 fn^^^^;.^''^''! '''''"{^}^ '" "^Htli^e 5-30 mm. long, 3-lobed at the apex, white- 

 wlu.n ?.!f fl revolute-margmed beneath, glabrate or sHghtly tomentose above 

 ^V 1^ T'l .°'''u' ■'^'^J't^liy; hypanthium funnelform; sepals oblong or elliptic; 

 §S^-JS/S''"''m''-^^^^ °™' ^°"^- ^'^^'- Mont.-N.M.-CaMf.-B.C. 



32. CERCOCArpUS H.B.K. Mountain Mahogany. 



Shrubs or trees with hard wood. Leaves alternate, simple, toothed or entire- 

 raargmed. Flowers axillary, solitary or fasciculate. Hypanthium with a cvlin- 

 dric persistent tube, abruptly widening into a turbinate or campanulate, 

 deciduous hmb. Sepals 5, from broadly triangular to nearly subulate. Corolla 

 wantmg. Stamens lo or more, inserted at different heights on the limb of the 

 o?l?nf ^'"^""-f '*'^ solitary, mserted in the bottom of the hypanthium; ovary 



♦prn^wf 1 I °^°'' f^^f^' '^v*' terminal, elongate, plumose; stigma undivided, 

 terminal. Seed cyhndnc, sohtary, basal. ° • ^ ' & 



Leaves serrate or dentate. 



^''cm.1on^ ^""^ ^^^'^''' ''^"^^- "^^^ spreading hairs; leaves broadly obovate. 1.5-3 



Hypantbium and leaves appressed-silky ^" ^' "^'^"^«""^- 



Xeaves obovate-flabelliform, 1-2 cm. long. 2 C ffabfllifolius 



Leaves oblanceolate or obovate 2-4 cm lono- o V.' -^^'^^"y*^""^' 



Leaves entire, from lin^^r to oYiwi^ ' i„-lJl^:,^^^S _.. > 3. C._ argenteus. 



margins 



resmous, -'— -. >tawu, u^^ic ui itraa icvuiuit; 



Leaf-blades 1.5-3 cm. long; tail of fruit 4-6 cm. long 



^^m^lSs-5^r^^. S ^^^^^^^^ ^--^-^-' - '^e -erely tomentulose beneath; 

 '''t^^rJ^^^\Tr^\'T^^^^ permanently white vm^us^'on^^^^^^^^^^ 



Leaf-blades 5-15 mm. long, narrowly linear, strongly revolute onlv the "n^rMb o^t^he 



lower surface exposed: tail of fruit 3-4 cm Ion I ^ miOriD ot tiie 



Leaves short-villous when youns « ^ • • 



Leaves glabrous from the b\°^SIing. f ; g; f^^^--^" 



-., 



