ROSE FAMILY 195 



pistils 8 to 24. — Moist grassy banks or meadows, 7500 to 12,750 feet: Sierra Nevada from Mari- 

 posa Co. to Tulare and Mono Cos.; White Mts. June-Aug. 



Locs. — Sierra Nevada: Clouds Eest, Yosemite, Mariposa Co., Chesnut <$• Drew; Vogelsang 

 Pass, Jepson 4429i ; Mt. Dana, Jepson 3290 ; Bloody Caiion, Mono Co., Jepson 4436 ; Gem Pass, 

 Mono Co., Kennedy; East Fork Kern Kiver, Jepson 5047; Volcano Mdws., Tulare Co., Hall ^ 

 Babcock 5467 ; Kaweah Mdws., Tulare Co., Purpus 5172 ; Hockett Mdws., Tulare Co., Jepson 4681. 

 White Mts. : Sheep Mt., Jepson 7324 (cauline leaves and bracts sometimes entirely wanting and 

 leaflets bristle-tipped, representing the form called Ivesia scandularis Eydb.). 



Var. lycopodioides Greene. Plants extremely dwarfed and much compacted, 1 to 2 inches 

 high ; herbage glabrate ; flowering stems scapose with a single pair of small bracts on the lower 

 portion ; leaf -blades terete, % to V^ inch long, the segments of the leaflets orbicular ; heads small, 

 314 lines broad; bractlets oval; pistils about 8. — Alpine, 11,000 to 12,000 feet: Mt. Dana (Jepson 

 3297). Intergrading with var. megalopetala and replacing it at very high altitudes. 



Var. chaetophora Jepson. Lower stipules broader, the free portion dilated; leaflets nar- 

 rowly oblong, usually bristle-tipped, ll^ lines long; cyme often open; bractlets linear to oblong; 

 petals narrowly obovate; stamens 10; receptacle enlarged, conoid; pistils 11 to 15. — Alpine, 8500 

 to 11,000 feet : mountains about the headwaters of the Kaweah and Little Kern rivers. June-Sept. 



Var. pygmaea Jepson. Stems erect or ascending, % to 4 inches high, the plants sometimes 

 extremely dwarfed; leaf -blades terete, (^/o or) % to 2 inches long, the leaflets minute, orbicular 

 or obovate, bristle-tipped ; petals oblanceolate to narrowly obovate ; stamens usually 10 ; recep- 

 tacle enlarged, conoid; pistils usually 10 or 11. — Alpine, 10,000 to 13,000 feet: Sierra Nevada 

 from Fresno Co. to Tulare Co. July-Aug. This variety intergrades with var. chaetophora. 



Locs. — Evolution Basin, Fresno Co., E. Ferguson 477; West Vidette, South Fork Kings 

 Eiver, Jepson 824; Harrison Pass, Jepson 5029; Mt. Brewer, Brewer 2812; Mt. Whitney, Burton 

 4" Ryerson 21 (extremely reduced form), Jepson 1072; Skyparlor Mdw., Chagoopa Plateau, 

 Jepson 5010; Farewell Gap, Piirpus 5178. 



Eefs.— POTENTILLA GORDONii Greene, Pitt. 1:106 (1887) ; Jepson, Man. 492, fig. 488 (1925). 

 Horhelia gordonii Hook. Jour. Bot. 5:341, pi. 12 (1853), type loc. upper Platte Eiver, Gordon; 

 Eydb. Mem. Dept. Bot. Columbia Univ. 2:151, pi. 92, figs. 7-11 (1898), N. Am. Fl. 22:289 (1925). 

 Ivesia gordonii T, & G, Pac. E. Eep. 6:72 (1857). I. alpicola Eydb.; Howell, Fl. Nw. Am. 1:182 

 (1898), type loc. Mt. Adams, Wash. Horkelia gordonii var. alpicola Eydb. Mem. Dept. Bot. 

 Columbia Univ. I.e. 152. Var. ursinorum Jepson, Man. 492 (1925), type loc. Bear Creek, Salmon 

 Mts., n. Trinity Co., Alexander <f Kellogg 313. Var. megalopetala Jepson, Man. 492 (1925). 

 Horicelia gordonii var. megalopetala Eydb. Mem. Dept. Bot. Columbia Univ. 2:152 (1898), type 

 loc. Mt. Dana, Bolander. Ivesia megalopetala Eydb. N. Am. Fl. 22:289 (1908). P. gordonii 

 var. scandularis Jepson, Man. 492 (1925). Horicelia scandularis Eydb. Mem. Dept. Bot. Colum- 

 bia Univ. 2:150, pi. 91, figs. 5-9 (1898), type loc. White Mts., SliocTcley 572. Ivesia scandidaris 

 Eydb. N. Am. Fl. 22:288 (1908). Var. lycopodioides Greene, Pitt. 1:106 (1887) ; Jepson, Man. 

 492 (1925). Ivesia lycopodioides Gray, Proc. Am. Acad. 6:530 (1865), type loc. Mt. Dana; 

 Eydb. N. Am. Fl. 22:288 (1908). I. gordonii var. lycopodioides Wats.; B. & W. Bot. Cal. 1:183 

 (1876). Horicelia lycopodioides Eydb. Mem. Dept. Bot. Columbia Univ. 2:151, pi. 92, figs. 1-6 

 (1898). Var. CHAETOPHORA Jepson, Man. 492 (1925). JS'orA^eZio c7iae<op7iora Eydb. Bull. Torr. 

 Club 26:543 (1899), type loc. Farewell Gap, Tulare Co., Purpus 1409. Ivesia chaetophora Eydb. 

 N. Am. Fl. 22:290 (1908). Var. pygmaea Jepson, Man. 492 (1925). Ivesia pygmaea Gray, Proc. 

 Am. Acad. 6:531 (1865), type loc. "Sierra Nevada", Brewer; Eydb. N. Am. Fl. 22:289 (1908). 

 I. gordonii var. pygmaea Wats.; B. & W. Bot. Cal. 1:183 (1876) in part. Horicelia pygmaea 

 Eydb. Mem. Dept. Bot. Columbia Univ. 2:152, pi. 93, figs. 1-7 (1898) in part. 



34. P. webberi Greene. Wire Ivesia. Stems reddish, slender or wiry, 2 to 

 4^/2 inches high, naked save for a pair of leaves at or above the middle; petioles and 

 stems pilose, the leaflets hirsute; leaves pinnate, the basal with blades % to 2% 

 inches long; petioles % to 1% inches long; leaflets 8 to 10, 2^/2 to 4 lines long, 

 approximate, 2 to 5-divided into linear acute segments ; cyme capitate or subcapi- 

 tate, leaf y-bracted ; flowers 3 to 3I/2 lines wide; calyx-tube densely white-hirsute 

 within; petals yellow, oblanceolate, acute, shorter than calyx-lobes; stamens 5; 

 filaments linear-subulate ; achenes 3 or 4. 



Montane, 5000 feet : Sierra and Plumas Cos. May. 



Geog. note. — A highly restricted endemic, Potentilla webberi has been recorded only from the 

 neighboring Indian and Sierra valleys in Plumas and Sierra counties. 



Eefs.— Potentilla webberi Greene, Pitt. 1:105 (1887) ; Jepson, Man. 493 (1925). Ivesia 

 weiberi Gray, Proc. Am. Acad. 10:71 (1874), type loc. Sierra and Indian Valleys, Webber. 

 HorTceliu webberi Eydb, Mem. Dept. Bot. Columbia Univ. 2:149, pi. 88, figs. 5-9 (1898). 



