78 ROSACES. (ROSE FAMILY.) 



spatulate, silky on both sides; those of the scape scattered and narrower: 

 calyx-lobes silky : filaments and styles exserted : carpels 3 to 8, somewhat 

 villous or glabrous, 2-seeded. Torr. & Gray, Fl. i. 418. W. Wyoming to 

 Montana and Oregon, and southward to New Mexico. 



3. AH UNO US, L. GOAT'S-BEARD. 



Herbaceous : the small white flowers in numerous filiform panicled spikes. 



1. A. Sylvester, Kost. Smooth, branching, 3 to 5 feet high: leaves 



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



^ sharply and laciniately doubly toothed, the terminal one broadest : panicle 



large and compound, pubescent : filaments long-exserted : carpels 3 to 5, 



smooth. Spiraea Aruncus, L. Ranges across the continent. 



4. PHYSOCARPUS, Maxim. NINE-BARK. 



Carpels 1 to 5, divergent. Ovules 2 to several. Diffuse shrubs: flowers 

 large, white. 



1. P. opulifolia, Maxim. A shrub 3 to 10 feet high, with ash-colored 

 shreddy bark : leaves ovate or often cordate, 3-lobed and toothed, on slender 

 petioles, nearly glabrous: flowers on long slender pedicels in simple umbel-like 

 hemispherical tomentose corymbs : carpels 2 to 5, glabrous. Spiraea opuli- 



. y- folia, L. Neiiiia opulifetiorrBeuih. & Hook. From California northward to 



British America and eastward across the continent. 



2. P. Torreyi, Maxim. A small shrub, differing from the last in its 

 smaller leaves, its finer pubescence, and the leaves sometimes densely ichite- 

 tomentose beneath, its fewer and smaller flowers on short pedicels, fewer stamens, 

 and especially the densely tomentose ovaries, which are fewer (1 or 2) and be- 

 come less inflated. Spiraea opulifolia, var. paucijlora, Hook., and in Fl. 

 Colorado var. parvifolia. Neillia Torreyi, Watson. In the mountains of 

 Colorado and westward to Nevada. 



5. CHAMJEBATIARIA, Maxim. 



Flowers large, white, in a leafy terminal racemose panicle. A stout, 

 diffusely branched, glandular-pubescent shrub. 



1. C. Millefolium, Maxim. More or less tomentose: leaves narrowly 

 i lanceolate in outline, scattered or fascicled at the ends of the branches, with 

 very numerous (about 20) pinnae and minute oblong obtuse leaflets (about 6 

 pairs) : the erect acute lobes of the calyx nearly equalling the orbicular petals: 

 carpels 5, pubescent. Spiraea Millefolium, Torr. Pac. R. Rep. iv. 83, t. 5. 

 From W. Wyoming ( Coulter) to California. 



6. HOLODISCUS, Maxim. 



Petals white, broadly oblong, about equalling the 5-parted calyx. A dif- 

 fuse shrub, with grayish brown bark : flowers in loose spreading panicles. 

 L, 1. H. discolor, Maxim. Pubescent, 4 feet high or more : leaves broadly 

 ovate, truncate at base or cuneate into a slender petiole, more or less silky- 



