2774 



POTENTILLA 



POTENTILLA 



stalked, margin irregularly biserrate, pilose and green 

 on both faces, often glandular: fls. ^-1 in. broad, long- 

 pedicelled; appendages much shorter and narrower 

 than the sepals, often bi- or trifid; petals obovate, entire, 

 equaling or much exceeding the sepals, white; carpels 

 smooth or rugulose; style subbasal, glandular-thick- 

 ened in the middle. May-July. Eu., Asia, and moun- 

 tains of W. N. Amer. Grows well in dry soil. 



11. argfita, Pursh. Similar to P. rupestris, but with 

 a more strict habit, more glandular-hirsute pubescence, 

 more congested infl., and smaller cream-colored petals 

 which scarcely exceed or are shorter than the sepals; 

 calyx enlarging more in fr., and receptacle becoming 

 elongated, much swollen and almost fleshy. June-Aug. 

 N. Amer. Good for dry rocky soil. 



12. glandulosa, Lindl. Similar to P. rupestris and P. 

 arguta: differs from the former in its golden yellow or 

 pale yellow fls., and from the latter both in the color 

 of the fls., and in the dichotomous and laxly cymose 

 infl. June-Aug. W. N. Amer. Grows well in dry 

 sterile ground. 



Subsection B. CONOSTYLJE. Style subterminal, conical. 



Series A. EBIOTRICHL^E. Plant with some true 



tomentum. 



13. Hippiana, Lehm. St. erect, 1-2 ft. high, silky, 

 laxly cymose above: basal Ivs. rather large, pinnate; 

 Ifts. 3-5 pairs, whitish-silky above, white-tomentose 

 beneath, uppermost somewhat confluent, the others 

 decreasing regularly toward base of If., obovate-cuneate, 

 1-2 K in. long, obtusely incised-toothed : fls. ^-1 in. 



. , . . 



broad; appendages nearly equaling the calyx, acute; 

 petals obovate, retuse, slightly exceeding the sepals, 

 bright yellow; carpels glabrous, rugose; style papil- 

 lose-thickened at base, tapering above to the enlarged 

 stigma. June, July. W. N. Amer. 



14. grficilis, Douglas. Erect and rather tall, about 2 ft. 

 high, more or less white-hairy, erect-branched and 

 cymose-paniculate above: basal Ivs. long-petioled, 

 digitate; Ifts. 5-7, obovate or oblanceolate, 1-2 in. long, 

 deeply and regularly incised-dentate, sparsely pilose or 

 glabrous and green above, white-tomentose beneath: 

 fls. 6-9 lines broad, showy; petals obcordate, exceeding 

 the acuminate sepals, yellow; carpels glabrous and 

 smooth; style subterminal, slender, thickened at the 

 base. June-Aug. W. N. Amer. 



15. nepalensis, Hook. (P. formosa, Don. P. Tdnguei, 

 Hort.). St. stout, erect or ascending, 1-2 ft. high, pur- 

 ple : the branches laxly paniculate or raceme-like, hir- 

 sute, not glandular: radical Ivs. long-petioled, pal- 

 mately 5-foliolate, often 12 in. long; Ifts. oblong-obo- 

 vate, 2-3 in. long, veiny and rugose, crenate-serrate 

 except toward the base, with broad and short sub- 

 acute teeth, green both sides, sparsely appressed-pilose : 

 fls. long-pedicelled, showy, 9-12 lines broad; calyx 

 purple within; petals broadly obcordate, deeply emar- 

 ginate, nearly twice the length of the sepals, clear pur- 

 ple with darker veins and dark-purple base; carpels 

 glabrous, rugulose; style subterminal, thickened at the 

 base, tapering above. July, Aug. Himalayas. The 

 branches elongate zigzag-like during the summer. A 

 fine species. 



16. Thurberi, Gray. Similar to P. nepalensis, but 

 finely glandular-hairy all over: Ivs. mostly 7-foliolate: 

 petals dark purple and scarcely exceeding the sepals: 

 infl more cymose. June-Aug. New Mex. and S. 

 Cam. Good for border planting. 



17. haemat6chrus, Lehm. St. stout, ascending, 8-16 

 in. high, densely cymose above, pubescent or canescent 

 with yellowish hairs: basal Ivs. with long and stout 

 petioles, palmately 7-, rarely 5-foliolate; Ifts. oblong- 

 obovate, obtuse, thick, elevated-veiny beneath, cre- 

 nate-serrate with small teeth, velvety above with yel- 

 lowish subappressed hairs, more or less densely 



white-tomentose below: fls. on thick pedicels, 9-10 

 lines broad; sepals purple within; petals broadly 

 obcordate, longer than the sepals, dark purple; carpels 

 glabrous, smooth; style subterminal, red, much 

 thickened at the base. June-Aug. Mountains of Mex. 

 The yellowish pubescence is characteristic. 



18. argyrophylla, Wall. (P. insignis, Royle). Sts. 

 erect, 8-16 in. high, nearly simple, leafy, cymosely 

 few-fld., above puberulent and whitish tomentose : basal 

 Ivs. large, long-petioled, mostly ternate; Ifts. subses- 

 sile, broadly obovate or elliptic-ovate or obovate- 

 oblong, more or less rugose beneath, coarsely incised- 

 serrate with acute teeth, more or less densely silky 

 above, rarely subglabrate, densely white-tomentose 

 beneath: fls. long-pedicelled, showy, 1-1 J^ in. broad; 

 petals broadly obcordate, twice the length of the sepals, 

 yellow; carpels glabrous, smooth; style subterminal, 

 greatly thickened at the base. June-Aug. Himalayas. 

 This species and the next are two of the most com- 

 mon species in cult., and are extensively hybridized 

 with each other and with P. nepalensis, giving rise to 

 most of the hybrid potentillas of the trade. (Fig. 3157.) 



19. atrosanguinea, Wall. Similar to P. argyrophylla, 

 but larger, more branched, Ivs. less heavily silky-glossy 

 and less white-tomentose beneath, usually more bluntly 

 toothed: petals, stamens, and styles dark purple. June- 

 Aug. Himalayas. Parent of many garden forms. 



20. villosa, Pall. Sts. stout, ascending, 4-12 in. 

 high, few-lvd., cymosely few-fld., densely silky-villous : 

 basal Ivs. long-petioled, ternate; Ifts. sessile or nearly so, 

 thick and veiny, suborbicular-cuneate. 9-15 lines long, 

 lateral oblique at the base, all coarsely crenate-serrate 

 with short teeth, margin somewhat revolute, densely 

 silky-pilose above, densely white-tomentose beneath: 

 fls. 9-12 lines broad, showy; sepals and bracteoles 

 equal; petals broadly obcordate, 2-3 times the length 

 of the sepals, golden yellow; carpels glabrous, smooth 

 or rugulose; style subterminal, conical, moderately 

 thickened at the base. June, July. Arctic Asia and 

 N. W. Amer. Showy, with beautiful If.-rosettes. 



21. argentea, Linn. Sts. several, ascending, rarely 

 prostrate, slender, 4-20 in. long, laxly paniculate or 

 corymbose above, white-tomentose: basal Ivs. long- 

 petioled, palmately 5- rarely 7-foliolate; Ifts. broadly 

 cuneate-obovate, 4-14 lines long, coarsely and regu- 

 larly incised-dentate with 2-5 pairs of teeth, margins 

 revolute, from green and glabrous to densely silky or 

 tomentose above, densely white-tomentose beneath, 

 very rarely tomentose and green beneath: fls. long- 

 pedicelled, 5-7 lines broad; petals obovate, emarginate, 

 scarcely exceeding the sepals, sulfur-yellow; carpels 

 glabrous, rugulose; style subterminal, conical, papil- 

 lose-thickened at the base. June-Aug. or Oct. Eu. 

 and Asia, intro. in N. Amer. Good for dry, sterile 

 soil. Var. calabra. Sir. (P. calabra, Ten.). Lfts. 

 dilated-fan-shaped, incised on outer edge, whitened on 

 both sides: plant low: sts. stout, declined, condensed- 

 cymose: fls. relatively large. Italy. 



Series B. ORTHOTRICH^. Plant with no true tomentum; 

 pilose and often glandular. 



22. recta, Linn. Sts. stout, erect, strict, 12-28 in. 

 high, leafy, dichotomously much branched and widely 

 corymbose above, hirsute or pilose and pubescent, and 

 more or less glandular: basal Ivs. large, long-petioled, 

 palmately 5-7-f oliolate ; Ifts. 2-4 in. or more long, the 

 outer smaller, all usually sessile, oblong, linear-oblong 

 or oblong-obovate, regularly and coarsely serrate- 

 dentate, green both sides, villous and rugose, thin: fls. 

 8-12 lines broad; petals obcordate, deeply emarginate, 

 equaling or somewhat exceeding the sepals, yellow to 

 golden yellow; carpels glabrous, very rugose; style 

 swollen at the base. June, July. Eu. Very hand- 

 some and showy. Var. sulph&rea, Lam. Petals sulfur- 

 yellow, much exceeding the sepals: sts. and Ivs. lighter 



