182 



ROSACEJ?:. Horkelm. 



5. H, tenuiloba, <!i'!iy. Canescontly villous, a foot high : Icafhits 8 to 12 jiaiis, 

 small {•! or S linos lung), cuneate-obovatu, dtHiply 4 - 8-cleit wilh linear lubes, ur iii 

 tho \\\)\)^iv leaves nanow and lew-lubecl ur linear and entire : lluwers in close cymes; 

 bracts shurt : calyx 2 lines long; lobes linear, a little shorter than tho oblong-spatu- 

 lato petals. — I'roc. Am. Acad. vi. b'l\) ] Watson, But. King Exp. 448. II. coikjcsUi, 

 var. tenuiloba, Turrey, I'ac. K. Kop. iv. 84. 11. coiujtsta, Newberry, I'acil'. It. \.ic\}. 

 vi. 73. 



On Santa Rosa Creek {bUjtlow) ; on Hat Creek, near Lassen's I'eak, Newberry. 



C. H. Bolanderi, tJray. Densely hoary-puboscent, cespitose, the stems 3 or 4 

 inches high : leallets numerous, about 2 lines long, cuneate-obovate, with 3 to 5 

 oblong or rounded lubes : flowers in a rather open cyme : calyx 2 lines long, about 

 et|iialling the obloiig-spatulato petals. — Proc. Am. Acad. vii. 338; Watson, 1. c. 



V^ar. Parryi, Watson. Less densely jjubesceut : leaflets often broadly and ab- 

 ruptly cuncale : flowers larger, 3 or 4 linos long. 



f)ry alkaline soil, near Clear Lake, Bulamler. Tlie variety in the mountains above San Ber- 

 nardino, J'urri/, 1S75. 



7. H. purpurascens, Watson. Pubescent antl somewhat villous, (i inches 

 high: leaflets numerous, approximate, 2 - 4-i)arted ; segments oblong to obovate, 2 

 or 3 lines long or less : flowers few, in an o|)en cyme : calyx pur|»lisli, about 4 linos 

 long; bractlets .small and narrow: petals roso-coloretl, broadly cunoato-obh.ng, nearly 

 e([ualling the calyx: stamens 20; tho filaments op[iosito to tho calyx lobes and 

 bractlets subulate, the alternate ones filiform : carpels 20 to 25. — Proc. Am. Acad. 

 xi. 148. 



In the Sierra Nevada, abont the liead-waters of lieru River, at 9,000 feet altitude, Dr. J. T. 

 Eothrock. Peculiar in the number of the stamens. 



-^+ -n- Leajiets few-toothed at the truncate apex. 



8. H. tridentata, Torr. Pubescence silky-villous, mostly appvessed, often 

 dense : stems usually a s[)an high or more : leaflets 2 to 5 pairs, cuneate-obovate to 

 narrowly oblong, usually 3-toothed at tho ajiox, a half-inch to an inch long : flowers 

 on slender pedicels in a contracted much-branched cyme : calyx 2 or 3 lines long, a 

 little shorter than tho lin(;ar to broadly spatulate petals : filaments often filifin-in or 

 the longer ones only slightly broader below, sometimes dilated : receptacle often 

 villous : akenes occasionally rough-tuberculato. — Pacif. K. lie}), iv. 84, t. G. Jvesia 

 tridentata, Gray, I'roc. Am. Acad. vii. 338. II. Tiliiu/i, Pegol, Trudi I'etorb. i. 

 151, & (Jarteiifl. 1872, t. 711. 



in tlie Siena Nevada, from Yoscmito Valley to I'himas Co., Mrs. M. E. 1'. Ames. A si)ei:ics 

 which goes far in its variations to unilo this genus with the ne.xt. 



17. IVESIA, Ton-. & Gray. 



Stamens 20, in one to three rows ; filaments slender, filiform. Carpels few, upon 

 a villous receptacle : styles filiform. — Herbaceous perennials of the Sierra Nevada 

 and eastward ; leaflets usually numerous and parted or very deeply cleft, often 

 closely imbricated ; flowers white, yellow, or jjurple, in cymes or open panicles. 

 Characters otherwise as in Ilorkelia. — Gray, Proc. Am. Acad. vi. 530; Watson, 

 Eot. King Exp. 448. 



* Floivers in rather dose panicled cymes : stems slender, mostly leafy : not alpine. 



1. I. Pickeringii, Torr. Densely white silky-villous, about a span high : 

 leaflets very numerous, at first closely imbricated, 2-5-{)arted or lobed or often 

 entire, the segments oblong, 1 to 4 lines long : stems panicled above, the cymes 

 densely many-flowered : calyx 2 linos long or less ; bractlets linear : petals yellow- 



