POTENTILLA 



POTENTILLA 



2773 



DD. Lts. not tomentose beneath. 



E. Lfts. 3-toothtd at apex 5. ambigua 



EE. Lfts. sereral-toothed. 



F. The Ifts. small, Yiin. long 

 or less: fls. 3-6 lines 



broad 26. dubia 



FF. The Ifts. larger: fls, %in. 

 broad or more. 



G. Achenes pilose 6. eriocarpa 



GG. Achenes glabrous, either 



smooth or rugose 24. grandiflora 



Section I. TRICHOCARP.E. Carpels completely or in 

 part pilose (except P. palustris): receptacle long- 

 and dense-pilose. 

 Subsection A. RHOPALOSTYLJ:. Style clavaie. 



1. fruticosa, Linn. St. shrubby, much branched, 

 mostly 1-4 ft. high, with peculiar shreddy bark: Ivs. 

 all cauline, pinnate; Ifts. 3-7, small, 6-12 lines long, 

 oblong-linear, acute, silky, with revolute margins: fls. 

 numerous, bright yellow, showy, 8-16 lines broad; 

 receptacle, carpels, and disk all long-hairy; style sub- 

 basal, clavate. June-Aug. Boggy or dry, more or less 

 calcareous soil, Eu., Asia, X. N. Amer. J.H. III. 31 :602. 

 A useful shrub, flowering throughout the summer. 

 Var. Vilmoriniana, Bean, has Ivs. silvery white be- 

 neath and fls. creamy white. Var. albicans, Rehd. & 

 Wilson, is similar but has yellow fls. China, and cult. 

 Var. dahurica, Lehm., is white-fld. L.B.C. 10:914 (as 

 P. glabra). Var. Veitchii, Bean, white-fld., is P.fruti- 

 cosaxP. dahurica (P. Friedricksenii, Spaeth). B.M. 

 8637. In nature, P. fruticosa runs into many forms. 



Subsection B. NEMATOSTYLU. Styk filiform. 



Series A. SL'FFKUTICCLO&E. Suffruiicose: fl.-bearing 



sts. terminal on the determinate plant axis. 



2. Salesoviana, Steph. Sts. 12-24 in. high, woody at 

 base, laxly cymose above, and silky villous: stipules 

 broadly scarious, fuscous: basal Ivs. pinnate; Ifts. 7-9, 

 rarely 5, lower much smaller, all short-petiolulate, 

 oblong or cuneate-oblong, coarsely and sharply serrate, 

 thick or subcoriaceous, green and glabrous above, pale 

 appressed pilose below, often furfuraceous and canes- 

 cent: fls. 1% in. broad; sepals purple outside, yellowish 

 within, twice as long as the appendages; petals broadly 

 obovate, entire, about equaling the sepals, lilac or white 

 suffused with rose; carpels villous; style lateral, filiform. 

 June-Aug. Asia. B.M. 7258. A beautiful and striking 

 plant of dry stony places. 



3. palustris, Scop. (Comarum palustre, Linn.). Suf- 

 fruticose: stolons long, creeping and branched: aerial 

 sts. ascending, 8 in. to 2 ft. long, glabrous, laxly cjinose 

 above and more or less pilose or glandular: basal Ivs. 

 pinnate, long-petioled; Ifts. 2-3 pairs, contiguous, 

 thick, not veiny, sessile, oblong-lanceolate, 1-3 in. 

 long, evenly and sharply serrate, green above, glaucous 

 beneath, often puberulent, rarely silky: fls. few; sepals 

 dark purplish, large; petals small, ovate-lanceolate, 

 acuminate, pale purple, often villous or ciliate, shorter 

 than the sepals; receptacle spongy; carpels glabrous; 

 style lateral, filiform. June-Aug. Very wet marshes, 

 Arctic and Temp. Eu., Asia, and N. Amer. A strik- 

 ing species for aquatic gardens. 



4. tridentata, Soland. Caudex somewhat woody: sts. 

 1-12 in. high, slender: branches erect-spreading, ap- 

 pressed-pubescent : Ivs. mostly basal, long-petioled, 

 ternate; Ifts. J^-2 in. long, oblanceolate, truncate and 

 2-3-toothed at apex, cuneate and entire below, coria- 

 ceous, dark green, glabrous or strigose and paler beneath : 

 fls. several, small, 3-5 lines broad, in a terminal, nearly 

 naked cyme; petals oval, entire, exceeding the calyx, 

 white; carpels villous; style sub-basal, long-filiform. 

 June-Aug. Rocky places, *X. E. N. Amer. Good for 

 dry banks and rockeries. 



5. ambigua, Camb. Sts. slender, subrepent or as- 

 cending, tufted and branched, woody below: Ivs. ter- 



nate; Ifts. subcoriaceous, lateral sessile, terminal long- 

 stalked, obovate or orbicular-cuneate, nearly as broad 

 as long, coarsely and obtusely 3-toothed, green above, 

 glaucous beneath, appressed pilose on both sides or 

 subglabrous: fls. solitary on the branches, long-pedun- 

 cled, %-l in. broad; peduncles strigose; appendages 

 and sepals subequal; petals suborbicular, slightly 

 retuse, much exceeding the sepals, yellow: carpels 

 pilose. July, Aug. Himalayas. 



6. eriocarpa, Wall. Caudex branched, woody: fl.-sts. 

 flaccid, simple, ascending, 4-8 in. long, almost leafless, 

 sparsely pilose or subglabrate, 1-2-fld.: basal ivs. 

 ternate or pinnately 3-foliate; Ifts. more or less long- 

 stalked, obovate-rhomboid, coarsely and sharply 5-7- 

 toothed above, green both sides, subglabrous: fls. con- 

 spicuous, 1^4 in. broad, long-peduncled; appendages 

 broad, usually longer than the sepals; petals round- 

 ovate, much exceeding the sepals, soft yellow with large 

 orange blotch; carpels long-pilose; style subterminal, 

 filiform or slightly swollen at the middle or above. July, 

 Aug. Himalayas. iShowy for borders and rockeries. 



Series B. HERBAGES. Herbaceous: fl-bearing sts. 

 lateral on the indeterminate plant axis. 



7. specidsa, Willd. Caudex thick, branched, woody: 

 fl.-sts. ascending, 2-10 in. long, few-lvd.: basal Ivs. 

 ternate, long-petioled; Ifts. thick, obovate, terminal 

 slightly stalked, all crenate-dentate above base, with 

 short teeth, white-tomentose on both sides or only 

 below: fls. 3-8, short-pedicelled, 7-9 lines broad; ap- 

 pendages narrow; sepals rather obtuse; petals scarcely 

 exceeding the sepals, long-canaliculate-unguiculate, 

 terminating in a very small ovate-cochleate limb, 

 tardily deciduous, white or yellowish white, dorsally 

 ciliate or more or less villous; carpels pilose; style 

 subterminal, slender, not dilated. June-Aug. S. Eu. 



8. nitida, T,irni. Cespitose; caudex subligneous: fl.- 

 sts. ascending, short, 1-2 in. long, usually not exceed- 

 ing the Ivs., apex 1-2-fld.: peduncles often glandular: 

 basal Ivs. ternate (rarely 4-5-nate), short-petioled, 

 crowded; Ifts. thick, sessile, oblong-obovate or sub- 

 cuneate, apex with 3 incurved teeth, rarely entire, 

 densely white-silky on both faces: fls. conspicuous, 

 9-12 lines broad or more; appendages narrow, shorter 

 than the purple sepals; petals very short-clawed, 

 broadly obovate, emarginate, twice as long as the sepals, 

 rose or lilac, rarely white; filaments and anthers purple; 

 carpels pilose; style subterminal, long, slender, purple. 

 July, Aug. Mountains of S. Eu. "One of the most 

 beautiful of alpine fls." 



9. alba, Linn. Caudex thick, branched: fls.-sts. 

 short, not exceeding the basal Ivs., weak, decumbent, 

 laxly 2-5-fld., sericeo- villous: basal Ivs. long-petioled, 

 5-foliolate, some often ternate or 7-foliolate; Ifts. ses- 

 sile or short-stalked, all symmetrical but the outer 

 shorter, oblong-lanceolate, apex acute and serrate, 

 teeth few, appressed, terminal smaller, green and gla- 

 brous above, more or less densely white-silky, becoming 

 glabrous and glaucous beneath: fls. long-peduncled, 

 showy, 9-12 lines broad; appendages very narrow, 

 shorter than the sepals; petals broadly obcordate, 

 somewhat longer than the sepals, white; carpels pilose; 

 stvle subterminal, slender. April-June, and often 

 Aug.-Oct. Cent, Eu. G. 37:98. 



Section II. GYMNOCARP.E. Carpels glabrous: receptacle 



short-pilose to almost glabrous. 



Subsection A. CLOSTEROSTYUE. Style subbasal, 



fusiform. 



10. rupestris, Linn. Caudex thick, subligneous: sts. 

 erect, 20 in. high or more, few-lvd., dichotomously 

 branched and laxly corymbose above, glandular-hairy 

 and hirsute: basal Ivs. long-petioled, pinnate; Ifts. 

 2-4 pairs, decreasing downward, distant, round-elliptic 

 or rhombic-ovate, lateral sessile, terminal sessile or 



