ROSE FAMILY 



165 



2. S. densiflora Nutt. Erect, 1 to 3 feet high with reddish bark; leaf -blades 

 elliptic to ovate, sharply and often unequally serrate, but entire towards the 

 rounded base, % to 1 (or 2I/2) inches long; corymbs terminal, roundish, % to 2 

 inches broad; calyx-lobes erect; petals roundish-obovate. 



Rocky mountain slopes or ridges, often in clefts of granite rocks, 4800 to 9000 

 (or 11,000) feet : Sierra Nevada from Tulare Co. to Lassen Peak; Mt. Shasta; Hum- 

 boldt and Trinity Cos. to Siskiyou Co. North to British Columbia. July- Aug. 



Locs. — Sierra Nevada: Twin Lakes, 

 Tulare Co., W. Fry; Alta Peak, Newlon 

 28; Piute Pass, Inyo Co., ace. Peirson; 

 Bald Mt. above Shavers Lake, Fresno Co., 

 A. L. Grant 1183; Huntington Lake, Jep- 

 son 12,979; Lake Merced, Merced Eiver, 

 Jepson 3208; Matterhorn Cafion, Tuo- 

 lumne Co., Jepson 4499 ; Kennedy Lake, 

 Tuolumne Co., A. L. Grant 469; Silver 

 "Valley, Alpine Co., Jepson 10,145 ; Mt. 

 Tallac, Lake Tahoe, Jepson 8138 ; Summit 

 sta., Nevada Co., Jepson 13,854; Silver 

 Lake, Lassen Co., Baker 4~ Nutting ; Las- 

 sen Peak, R. M. Austin; Ash Creek, Mt. 

 Shasta, M. S. Baker. North Coast Eanges : 

 Horse Mt., Humboldt Co., Tracy 7630; 

 Deadfall Creek, Trinity Co., Alexander 4" 

 Kellogg ; Shackelford Creek, Siskiyou Co., 

 Butler 277. 



Ref s. — Spiraea densiflora Nutt. ; 

 T. & G. Fl. 1:414 (1840), as synonym, col- 

 lected by Nuttall, type loc. not stated but 

 Blue Mts., Ore., ace. Rydberg, N. Am. 

 Fl. 22:248; Greenman, Bot. Gaz. 25:261 

 (1898) ; Jepson, Man. 478, fig. 473 (1925) . 

 S. hetulaefolia Pallas, Fl. Ptoss. 1:33, t. 16 

 (1784). <S. betulaefolia var. rosea Gray, 

 Proc. Am. Acad. 8:381 (1873), type loc. 

 Oregon, ElUiu Hall. S. lucida var. rosea 

 Greene, Pitt. 2:221 (1892). S. arbuscula 

 Greene, Erythea 3:63 (1895). S. splen- 

 dens Baumann; K. Koch, Monats. Ver. 

 Bef. Gart. Preuss. 18:294 (1875), type 

 from Cal. S. helleri Rydb. N. Am. Fl. 22 : 

 248 (1908), type loc. Summit sta. (Donner 

 Pass), Nevada Co., Heller 7022. 



3. S. caespitosa Nutt. Root- 

 crown compactly branched, woody, 

 densely clothed with rosulate tufts 

 of leaves and forming mats iy4 to 3 

 feet broad; flowering stems ascend- 

 ing, 21/2 to 6 inches high; scape-like, with few small leafy bracts; leaves oblong- 

 obovate, entire, acute, densely silky, 2 to 6 lines long; spikes i/^ to 2 inches long; 

 calyx densely tomentose; petals oblong-oblanceolate, obtuse. 



Limestone rocks in desert ranges, 4000 to 8000 feet : Providence Mts. ; Panamint 

 Range ; southeast end of the Sierra Nevada. East to the Rocky Mts., north to south- 

 ern Oregon. May. 



Locs. — Providence Mts., T. Brandegee; Panamint Canon, Inyo Co., Hall # Chandler 7010; 

 Big Arroyo, Tulare Co. Nevada: Miller Mt., Mineral Co., Shockley; Lee Canon, Charleston Mts., 

 Heller 11,064. 



Eefs.— Spiraea caespitosa Nutt.; T. & G. Fl. 1:418 (1840), type loc. sources of the Platte 

 (River), Rocky Mts., Nuttall; Jepson, Man. 479 (1925). Eriogynia caespitosa Wats. Bot. Gaz. 

 15 :242 (1890). Luetkea caespitosa Ktze. Rev. Gen. PI. 1 :217 (1891). Fetrophytum caespitosum 



Fig. 159. Spiraea douglasii Hook, a, flower- 

 ing branchlet, X V2; &, long. sect, of fl., X 7 ; c, 

 petal, X 10 ; d, f r., X 7. 



