170 ROSACE^E. Spiraea. 



* * Petals white, broadly oblong, about equalling the ^-parted, calyx : filaments 

 scarcely exserted : carpels densely hairy : ovules 2 : flowers in loose spreading 

 panicles, 



3. S. discolor, Pursh. A diffuse shrub, 4 feet high or more, with grayish 

 brown bark, pubescent: leaves broadly ovate, obtuse or acutish, truncate at base or 

 cuneate into a slender petiole, more or less silky-tomentose beneath, nearly smooth 

 above, pinnatilidly toothed or lobed, the lobes often dentate: panicle much branched, 

 tomentose : calyx pubescent, the lobes oblong, obtuse v spreading. Flora, i. 342. 



Var. aricefolia, Watson. Often tall (5 to 15 feet high): leaves 2 or 3 inches 

 long, somewhat canescent beneath or scarcely so: panicle large and open. S. aria>- 

 folia, Smith in Rees Cyc. ; Lindl. Bot. Reg. t. 1365. 



Var. dumosa, Watson. Only 1 to 3 feet high ; leaves usually small, an inch 

 long or less, cuneate into a short margined petiole, often white-tomentose beneath : 

 panicle mostly smaller and less diffuse. S. dumosa, Nutt. ; Torrey, Stansbury Rep. 

 387, t. 4 ; Watson, Bot. King Exp. 80. S. aricefolia, var. discolor, Torr. & Gray, 

 Fl. i. 416. 



On low hills and in the valleys, mostly in the Coast Ranges, from Monterey County northward 

 to Fraser River., The var. dumosa is found in the Sierra Nevada, in dry rocky places, at 5,000 to 

 11,000 feet altitude, and thence to Oregon, Colorado, and New Mexico ; more rarely in the Coast 

 Ranges also. Fragrant, with the odor of Sweet Birch. 



2. Erect shrubs, with twice pinnate leaves and numerous minute leaflets : stipules 

 present: flowers perfect, large, in a leafy terminal racemose panicle. CHAM^E- 

 BATIARIA, Porter. 



4. S. Millefolium, Torr. Stout, diffusely branched, 2 to 5 feet high, glandu- 

 lar-pubescent and more or less tomentose : leaves narrowly lanceolate in outline, 

 scattered or fascicled at the ends of the branches, 1 to 3 inches long, with very nu- 

 merous (about 20) pinnse and minute oblong obtuse leaflets (about 6 pairs) ; stipules 

 linear, entire : flowers white, half an inch broad : calyx-tube turbinate ; the erect 

 acute lobes longer than the tube and nearly equalling the orbicular petals : stamens 

 included : carpels 5, pubescent : styles elongated : ovules 6 to 8, suspended : seeds 

 over a line long. Pacif. R. Rep. iv. 83, t. 5. 



Rare in the Sierra Nevada and the mountains eastward : above Owen's Lake at 10,000 feet alti- 

 tude (Muir) ; at Noble's Pass, Shasta Co. (Newberri/), referred by oversight to Chamcebatia ; 

 W. Arizona and S. Nevada (Biyelow, Wheeler) ; S. Utah (Mrs. Thompson, Parry) ; Wyoming 

 Territory, Coulter. 



3. Tall herbaceous perennial, with thrice pinnate leaves and no stipules : flowers 

 dioecious, small, white, in numerous filiform panided spikes : pedicels in fruit 

 reflexed. ARUNCUS. 



5. S. AruncilS, Linn. (GOAT'S-BEARD.) Smooth, branching, 3 to 5 feet high : 

 leaves large ; leaflets thin, sparingly villous beneath, ovate to lanceolate, acuminate, 

 2 to 5 inches long, sharply and laciniately doubly toothed, the terminal ones broad- 

 est : panicle large and compound, pubescent : flowers a line broad, nearly sessile : 

 petals spatulate : filaments long-exserted : carpels 3 to 5, smooth, several-seeded. 



In ravines and along streams, Trinity and Shasta counties (Brewer), and northward to Alaska. 

 Also in the Alleghanies, and in N. Asia and Europe. 



4. Low herbaceous perennial, woody at base, with simple entire leaves and no stip- 

 ules : flowers perfect, white, in dense cylindrical spikes on scape-like stems. 

 PETROPHYTUM, Nutt. 



6. S. caespitosa, ISTutt. Cespitose, on rocks, with simple or branching scape- 

 like stems : leaves rosulate on the short tufted branches of the woody spreading 

 rootstock, oblanceolate or linear-spatulate, acute, silky on both sides, 2 to 12 lines 

 long ; those of the scape scattered and narrower : scape 2 to 6 inches high : flowers 



