POTENTILLA 



north temperate and frigid zones, and <^h'»'"f^"'f^^^„H 

 their compound leaves, 5 bracteoles borne at the base of 

 thfi "i seoals which in turn are borne upon the edge ot 

 a cup shaped, dry receptacle; stamens 10-30, together 

 with the 5 rounded petals inserted upon the margin of 

 The receptacle: pistils many, in fruit becoming ramutje 

 akenes; styles deciduous. Those in cultivation are all 

 hardy perennial plants suitable for border planting. 

 The most valuable double-fld. forms are hybrids. 



K. M. WlKGAND. 



The American Potentillas are generally rather un- 

 attractive plants with small flowers. They are as a 

 rule very tenacious of life and do well with ordinary 

 <-are' P fntticosa, a handsome and distinct low shrub, 

 prefers moist positions, but will grow in even very 

 dry soil. Where thoroughly established in moist soil it 

 is difficult to eradicate. P. argenteashon\d be given a 

 dry soil, preferably about rocks. It is tenacious of life 

 and is quite attractive. P. Hippiana a western species 

 with comparatively large foliage of decided gray color 

 is hardy east. It is a good perennial preferring dryish 

 soil P. MdeHtata is an attractive evergreen species 

 forming thick mats. It does well in any fairly rich soil 

 in open or partially shaded positions. Potentillas are 

 prop by division or seed, the hybrids only by division. 

 P. (ruticosa may be increased by greenwood cuttings. 

 F. W. Barclay. 

 Hybrid Potentillas have nearly all the good qualities 

 we look for in a border plant.-handsome foliage and 

 free -blooming habit. They continue m bloom from 

 spring until autumn, although most profusely in June 

 and July. They cannot be said to be reliably hardy in 

 ♦he latitude of Boston, probably not above Washington. 

 Thev do not grow over two feet and seldom need stak- 

 ing A heavy soil suits them best. Choice varieties are 

 propagated by division of the rootstock in spring; cut- 

 tings will not root. They run mostly m shades of 

 maroon, scarlet and orange, often beautifully banded 

 with vellow. They bear seed freely, and when carefully 

 hybridized we may get a very fine strain with a good 

 proportion of double ones. Seedlings bloom the second 

 vear Some of the species make neat rock plants, es- 

 pecially P. Mdentata, P. vema and P. argenfea,-the 

 last, though common, is valuable in places in which 

 other plants will not grow. T. D. Hatfield. 



INDKX. 



AndrS, Dr., 16. Gordon! 5. O^^Xf ^|ee Co- 



arsentea, 15. gracilis. 14. palustns. bee 1.0 



awrophylla. »■ grandiflora, 7. "''"?"■,« 



atrosanKiiinea, 8. Hamlet, 16. perfects, 16 



Wcolor 16. Hapwoodiana,16. garpurea, 16 



cardinale, 16. Hippiana. 2. Pyrenaiea.U^ 



coccinea 9 hybrida, 16. Rolhnson Wm., 16. 



DTudin/ie. insionis^i. SJ^.^Xant 16 



Eldorado, 16. Jvesm.5. a ,,„ t "?,■„ ifi 



ir~;ie Ifi lariniata. 13. Salter. Je.->ne, 16. 



Ton 'oia. 9. laciniosa, 13. Tl?!"^^"'' !«■ 



fruticosi, 1. Lemoine, 16. tndent.a a, 6. 



Blandulosa. 3. Mars, 16. verna. 11. 



Gloirede Nancy, 16. Nepalensis, 9. vesi™e ."le. 



A. Basal leaves pinnate. 



B. Stem shrtibby 1. fruticosa 



BB. Stem herbaceous. . 



c. Zrvs. silky, tomentose beneath. 2. Hippiana 

 cc. Lvs, qreen on both sides. 



D. Lfis. targe, 1 in. long, den- 



fate 3. glandulosa 



4. rupestris 

 DD. Lfts. minute, H-^A in. long, . 



much divided 5. Gordoni 



AA. Basal lvs. palmately S-7-foUolute. 



B. Lfts. S. „...»» 



c. Fls. white 6. tridentata 



cc. Fls. yellow or red 7. grandiilora 



8. argyrophylls 



BB. Lfts. 5-7 9. Nepalensis 



c. Fls. red or purple 10. Thurben 



cc. Fls. yellow. 11- vema 



D. Lvs. green beneath 12. Pyrenaica 



13. laciniosa 



14. gracilis 

 DD. Lvs. white beneath 15. argentea 



POTENTILLA 



1421 



1. fruticdsa, Linn. Fig. 1935. Much-branched, 5 in. 

 to 4 ft. high, with peculiar shreddy bark: lvs. all pin- 

 nate; lfts. 3-7, small (6-12 lines long), oblong-linear, 

 acute, silky with revolute margins: fls. numerous, 

 bright yellow, showy, 8-16 lines broad; >*^yJ;«J^^'f™'_j 

 akenes, receptacle and I ' "^ 



sk all long-hairy. Swamps and 



1935 Potentilla fruticosa (X %) 



rocky places, N. Amer., Eu., Asia. J H. "J- 31:602 

 D. 12ir-A useful shrub, flowering throughout the 

 summer. 



" Hippiana, Lehm. Stem erect, stout, 1-2 ft. high, 

 silky, erect-branched above; stipules large, ovate- 

 lanceolate, subentire: basal lvs. rather large ; lfts. 3-5 

 nairs, whitish silky above, tomentose beneath, decreas- 

 ing in size toward base of leaf, obovate-cuneate, 1-2K in. 

 loig. obtusely toothed; cauline lvs. several and similar: 

 fls. deep yellow, %-\ in. broad, cyraose; bracteoles 

 nearly equaling the calyx, acute; petals slightly ex- 

 ceeding the sepals, retuse. Western America. 



3 glandulbsa, Lindl. Strict, 1-2 ft. high, slender, 

 viscid and glandular-hairy, erect, branched above: lvs. 

 mostly basal, 4-6 in. long; lfts. 3^ pairs 1-P4 m. long, 

 obovate, obtusish, coarsely serrate-dentate, nearly gla- 

 brous; cauline lvs. 3-parted : fls. rather large, yellow 

 petals entire, equaling the long-acuminate sepals; styles 

 thickened below, inserted at base of carpel: akenes 

 glabrous. Western U. S.; grows well in dry, sterile 

 ground. 



4 rupistxis, Linn. Very similar to the last, slightly 

 stouter: fls. larger, nearly white; petals entire, much 

 exceeding the calyx. June, July. Eu.- Grows well in 

 dry, sterile soil. 



5. G6rdom, Baill. (Iv'esia G6rdoni, Torr. & Gray). 

 Root stout: caudex woody and cespitose: stems erect, 

 4-12 in. high, and, like the lvs., glandular -pub"-—* 

 or glabrous: lvs. mostly basal, nui 

 crowded pairs ; cauline lvs. few, very small 

 and inconspicuous in a crowded cyme; petal 

 spatulate, shorter than the sepals; -*"™'>"= "" 



as; lfts. 10-20 

 all 



only 5 ; pis- 



_ Western U. S.; forms dense mats in dry soil. 



-Possibly generically distinct. 



6. tridentata, Soland. Often woody at the base, 1-12 

 in. high, slender: branches erect-spreading, appressed- 

 pubescent: lvs. mostly basal, long-petioled; lfts. J^-1 

 m long, oblanceolate, truncate and 2-5-toothed at the 

 apex, cuneate and entire below, coriaceous, dark green, 

 paler beneath: fls. several, small, 3-5 lines broad, m a 

 terminal, nearly naked cyme; petals oval, entire, ex- 

 ceeding the calyx; style lateral, flliform: akenes and 

 receptacle villous. June, July. Northern N. Amer., 

 Greenland, Scotland. -Good for dry banks and rockeries. 



