424 ROSACEiE. Geum. 



* * Styles naked, not exserted in fruit (leaves not lyrate). 



10. G. Rossii (Seringe) : scape 1-flowered, slightly pubescent above, 

 somewhat 2-leaved ; radical leaves interruptedly pinnate, rather glabrous, 

 minutely ciliate ; leaflets ovate or cuneiform, 2-3-lobed or entire ; petals 

 roundish, longer than the ovate segments of the calyx (the veins all distinct) ; 

 carpels minutely hirsute; styles not exserted in fruit, glabrous. — DC. inodr. 

 2. p. 653. Sieversia Rossii, R. Br. ! in Parry's 1st voy. appx. j). 276, t. C. ; 

 Cham, if Schlecht. ! I. c. ; Hook. ! I. c. Potentilla nivalis, Torr. ! in ann. 

 lye. New York, 1. p. 32, t. 3,/. 2. 



p. more pubescent, almost silky when young, somewhat larger; leaflets 

 more numerous and crowded; scape sometimes 2-flowered. — S. humilis, 

 R. Br. ! I. c. (without a description) ; Cham. 6f Schlecht. ! I. c. Geum tri- 

 florum, Torr.! in ann. lye. New York, 2. ^j. 195. 



Melville Island, Mr. James Ross! Capt. Parry! Sfc. On .Tames' Peak 

 of the Rocky Mountains, about lat. 42° (at an elevation of 10,000 feet). Dr. 

 James! Also Bay of St. Lawrence, Chamisso ! 0. Unalaschka, Mr. Nel- 

 son! Chamisso! Rocky Mountains, Dr. James! — The specimen of Dr. 

 James, on which Potentilla nivalis, Torr. was founded, differs from the 

 Sieversia Rossii, R. Br. from Melville Island only in the more nume- 

 rous and crowded leaflets, which are a little more strongly ciliate : the 

 scape is scarcely 3 inches high. A larger specimen, collected by Dr. 

 James, probably in a less elevated region, is about 5 inches high, with 

 more pubescent leaves and a 2-flowered scape, and is nearly intermediate 

 between the former plant and the Sieversia humilis from Unalaschka. The 

 pedicel of each flower bears a bract near the middle, resembling the cau- 

 line bracteiform leaves, and consisting, like tliem, of a small incised lamina 

 with the stipules adnate to its base. Petals yellow. CaXys. obconic and 

 hairy at the base. 



* * * Styles partly exserted in fruit, hairy below the middle : radicle leaves 

 lyrate: the terminal leaflet large and dilated, radiately veined; the lateral 

 few and minute or wanting. 



11. G. PeeMi {'Pxxr^h) : nearly glabrous; scape paniculately branched 

 above, several-flowered, scarcely leafy ; radical leaves lyrately pinnate ; the 

 terminal leaflet very large, roundish-reniform, somewhat truncate at the base, 

 crenately toothed and somewhat incised ; the lateral ones minute ; peduncles 

 and calyx clothed with a minute soft pubescence ; petals broadly obovate ; 

 twice the length of the ovate-triangular calyx-segments ; bracteoles minute ; 

 styles in fruit about twice the length of the calyx, hairy towards the base. 

 —Pursh ! fl. I. p. 352 ; Bigel. ! fl. Bost. ed. 2. p. 208 ; DC. ! x>rodr. 2. p. 

 554. Sieversia Peckii, R. Br. ! in Parry's 1st voy. appx. p. 276 ; Hook. ! 

 lot. mag. t. 2863. 



On the White Mountains of New Hampshire ! where it was discovered 

 by the late Prof. Peck of Harvard University. July. — Scape 12-18 inches 

 high (4-5 inches, ex iJ?'^eZo7«), furnished A\-ith 3 or 4 small and sessile incised 

 leaves, about 4-flowered. Terminal leaflet of the radical leaves often 4-5 

 inches in width. Flowers as large as those of G. montanum. 



. 12. G. radiatum (Michx.) : very hirsute or hispid ; scape leafy, panicu- 

 culately branched at the summit, many- (5-1 0-) flowered ; radical leaves 

 lyrately pinnate ; the terminal leaflet very large, broadly renifonn, with an 

 open sinus, incisely doubly toothed and somewhat lobed ; lateral leaflets few 

 and minute ; cauline leaves (4-6), sessile, laciniate-toothed ; petals deeply 



