Chamairhodos. ROSACEiE. 433 



Subtribe 4. Cham^rhode^.. — Calyx campanulate or rather flat, valvate 

 in aestivation. Stamens 5-10. Carpels 5-10, or sometimes numerous, dry 

 (as well as the receptacle) : styles lateral or terminal. Seed ascending or 

 suspended. Radicle superior. — Herbs or low suflTrutescent plants. 



.J^ 17. SIBBALDIA. Unn. (pnrtly) ; Lchh. Jl. Alt. 1. p. 480. 



Calyx ra'hcr flat, 5-ck'ft and 5-bracteolale. Petals 5, linear-oblong, 

 minute. Slaincus 5, alternate with the petals, inserted into the margin of 

 the villous disk which lines the base of the calyx : filaments short. Achenia 

 5-10, on very short hairy stipes : styles lateral : stigmas capitate, depressed. 

 Seed ascending, ampliitroixms. Radicle superior. — Procumbent or de- 

 pressed sufTruticose j)laiil.s, not glandular. Petals white or yellow. 



The genus difFers from Potentilla only in the fewer stamens and pistils, and 

 minute petals. 



1. S. jyrocvrnbens (Linn.): leaves tri(()liolate, on long ])etioles ; leaflets 

 cuneiform, 3-toothed at the summit, glabrous above, pubescent beneath ; pe- 

 tals acute, shorter than the eah^ (\-ello\v). — Ensl- hot. t. 897 ; Fl. Dan. t. 

 32 ; Pursh,Ji. l.p. 211 ; DC.'l. c.) Cham. S^- Schlecht. in Linnfea, 2. p. 28; 

 Hook. ! I. c. 



Greenland ! Labrador ! Unalaschka ! and on the summits of the Rocky 

 Mountains, lat 52°-56°, Drumnwnd ! Doitiiicis ! to lat. 42° (near perpetual 

 snow). Dr. James! Nuttall ! Also on tlie Mountains of Canada and Ver- 

 mont, according to Pursh : but this is very doubtful. 



18. CHAM.^RHODOS. Bunge, in Ledeb.fl. Alt. 1. p. 431. 



Calj'^x campanulate, deeply 5-cleft, ebracteolate ; the base lined with a 

 membranous disk, which is very" densely bearded at the margin. Petals 5, 

 obovate. Stamens 5, opposite the petals ! and inserted with them into the 

 sinuses of the calyx above the disk : filaments subulate, short, persistent. 

 Achenia 5-10 or more : styles arising near the base of the ovaries, subulate. 

 Receptacle conical, villous. Seed ascending, nearly orthotropous. Radicle 

 superior. — Small erect and branching glandular-pubescent herbs ; perennial 

 or biennial. Leaves many-cleft ; the segments linear. Inflorescence di- 

 chotomously cymose. Petals white or purplisli. 



— 1. C. erecta (Bunge) : stems slender, ])aniculately branched ; radical 

 leaves rosulate, ternately or biternately maiiy-eleft ; the segments very nar- 

 row, obtuse ; the upper cauline ones 3-5-cicfi ; petjds (wliite) longer than the 

 calyx; ovaries 5-20. — BunQe, in Ledeh. ! I. c. ; Hook. ! Jl. Bar. -Am. 1. 

 p. 196. Sibbaldia erecta, Linn. ; Lam. ill. t. 221, f. 2 ; DC. ! prodr. 2. 

 p. 587. 



/?. Nuttallii : flowers smaller ; petals scarcely longer than tlie calyx. — C. 

 Nuttallii, PicArcrin^/ ?nss. Sibbaldia erecta /(?. parviflora, Nutt. ! gen. 1. 

 p. 207. 



Rocky Mountains, lat. 52°-56=', J)r«/w»io«J/ and on the Saskatchawan, 

 Richardson. 1^. Missouri, near tiie Mandan villages, Nuttall ! — The plant 



55 



