78 ROSACEA. (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. ARUNCUS, L. Goat's-Beard. 



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



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

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

 sharply and laciuiately doubly toothed, the terminal one broadest : panicle 

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

 smooth. — Spircea 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, glalrrous. — Spircea opuli- 

 folia, L. Neillia opulifolia, Benth. & 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 ivhite- 

 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. paitciflora, Hook., and in Fl. 

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

 Colorado and westward to Nevada. 



5. CHAM51BATIARIA, Maxim. 



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

 diffusely brancbed, glandular-pubescent shrub. 



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

 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. 



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- 





