410 ROSACE.\E 



Leaves densely yellowish silky above, snow-white, tomentose and silky beneath. 



T J - , .„ , 14. P. Candida. 



L.eaves green and sparingly silky above, tomentose, but neither snow-white nor 

 silky beneath. 15 p Pecten 



Pubescence of the petioles and stem spreading. 16. P. Bakeri. 



IV. Pectinisectae. 



Leaves green finely silky beneath, slightly if at all tomentose. 17. P. pectinisecta. 

 Leaves wlute-tomentose beneath. 



Divisions of the leaflets scarcely revolute; petals 7-10 mm. long. 



Leaves loosely villous-tomentose above. 18 P lonoiJoba 



Leaves appressed-silky above. 19 p Blaschke'ana 



Divisions of the leaflets narrowly linear, revolute; petals 5-7 mm. long. 



20. P . flahelliformis . 



V. GlUCILES. 



Leaflets cut-toothed or cleft with lanceolate teeth. 



Leaflets with a cuneate entire base; tomentum sparse. 21 P intermittens 



Leaflets toothed or cleft along cheir whole marg&s miermtitens. 



Petioles with appressed or ascending hairs. 



Stem slender, 3-5 dm. high; inflorescence open, scarcely leafy. 



Q<^£im o+^,,+ A -7 ^ u- u ^ , « 22. p. viridescens. 



•Stem stout. 4-7 dm. high, erect, leafy as well as the inflorescence. 



Leaves grayish green beneath, only slightly tomentose. 



t'« J 1 1 .. 23. P. nlomerata. 



Leaves densely white-tomentose beneath; stem densely hairy. 



Petioles with spreading hairs. ^^- ^' ^*^'^^^^- 



^^^fwi'.^rfoVf^H^^^^i^*^'^"!^^^^^^ oblanceolate. sparingly hairy or glabrate 

 aDo\e, petals often 1 cm. long. 25 P oracilis 



Leaflets obovate, densely hairy above; plant 3-4 dm. high"; petals 5-6 mm. 

 Leaflets merely crenate with rounded or ovate teeth. 27. p'. fOi^^s!^''^' 



n^^ • VI. SUBJUGAE. 



One species. oq d « ». • 



28. P. subjuga. 



VII. AUREAE. 



Leaflets toothed, the toothmg not deeper than half-way to the midrib 

 Leaflets crenate with rounded or rounded-ovate, obtuse teeth 



Leaflets do^se^yto^^^^^^^ cleft with lanceolate or oblong.' acl^te^r Kfy obiusish 



Mets Si^^^*nr''j;.?n^'''?*^i 1*^^^^ ^"^"^ spreading. 35. P. concinnaeformis. 

 l^eaflets^cuneate or cuneate-oblanceolate. toothed above the middle, teeth ascend- 



^^^n^e!"^*^^'' densely silky-strigose. the basal ones often inchned to be pin- 

 Leaves slightly pubescent, in age glabrous and somewhat glaiicou^dfgit^^^ 



^^^feelfclea^^^^^^^ two-thh-ds to the^mid'^rib'oTSer"- 



Leaflets cleft mto oblong or lanceolate divisions, slightly silky-strigose, in age glabrate. 



Leaflets divided into linear divisions, permanently strigose. If. P, ?^uUis7cfa: 



VIII. COXCTNX.\E. 



'^'"aet^iipffdlS'^i'e^Z. -^^ ^^^"^ ^^^«^- «^^ ^^^^^«^ *f -t -» tomentose beneath. 

 Leaflets merely toothed. t^ecien. 



Inflorescence many-flowered and dense. 34 p fastinintn 



T . fl Inflorescence few-flowered and open. 35 p conc^nnaPfnrmU 



Leaflets densely white-tomentose beneath conannaeformts. 



Leaflets merely crenate or serrate. 



'^iZ^^'Sl Irt'^J:^"''^^'^^^- *««"-^ --P* ^* the very base. . 

 Sepals lanceolate, acuminate. ^^- ^- '^''""""«- 



Leafletsobovate, few-toothed. (Occasional forms of) 42. P nivea 

 Leaflets oblanceolate. many-toothed. (Depauperate forms of) 



^"tpex."'''''""' ^'^ ^°'^^ °'^'"«^^' °^li' 3-toothed (seldom ^54o^thed) at the 

 Leaflets deeply dissected. '^^- ^- ^^^renata. 



Bractlets lanceolate or linear-lanceolate, acute; petals light yellow 

 Plant diffuse; sepals ovate; leaves more or ItSs grayish above 



Plant erect or ascending: sepals lanceolate. acuminate;la4gr^n above. 



Bra.tl^s_ linear, obtuse; petals 4 mm. long, golden-yelloi'; i^»e"nttather 



40. P. modesta. 



