148 BOTANY. 



Townsendia* Rothrockii, Gray,! in herb. — Perennial, stem less ; 

 leaves narrowly spatulate, narrowed into a petiole as long as the blade, 

 both together 1' long ; blade thickish, entire, smooth ; petiole expanded 

 toward its insertion, and with a few silky hairs ; heads sessile, 1' in diam- 

 eter, obtuse scales of the involucre in 3-4 series, oblong or narrowly oval, 

 purplish, thickish, margins distinctly ciliate, or toward the apex sometimes 

 slightly fimbriate lacerate ; rays fertile, blue or purplish, exceeding the disk 

 by one-half, 1-1^" wide, entire or toothed; pappus somewhat united at 

 base, squamellate-subulate, one-fourth as long as the tube, with one or 

 two bristles exceeding the others ; disk-flowers yellow, about as long as the 

 rather unequal pappus ; achenia rather hairy, oblong, flattened. Heads 

 one or more from the same caudex. Apparently a somewhat variable 

 species, but sufficiently distinct from T. sericea, to which it most near!}' 

 approaches by the obtuser scales to the involucre, the shorter and broader 

 rays, and the short pappus of the ray-flowers. It will hence be observed 

 that it approaches Nanastrum, though kept distinct by its perennial root. — 

 South Park, Colorado, at 13,500 feet (875). (Also either 418 or 417 of the 

 already distributed sets, but from a mixing of labels I cannot determine 

 which.) — Plate VII, A. Natural size. 1 Inner involucral scale. 2. Ray- 

 flowers. 3. Ray-style and stigma. 4. Portion of ray-pappus, magnified 

 about 25 diameters. 5. Disk-flower. 6. Cross-section of achenium. 7. 

 Style and stigma of disk-flower. 8. Bristle from ray-pappus. All enlarged 

 about 10 diameters, except where otherwise specified. 



Townsendia sericea, Hook. — Resembling the above in general habit, 

 but differing in having silky-canescent and narrower leaves, acute scales 

 to the involucre, longer and narrower rays, and a longer pappus to the 

 ray-flowers. — Colorado (419), at Kit Carson (on the plains), and also a 

 var. with shorter rays and more hairy and narrower leaves at Georgetown, 

 among the mountains. 



* Townsendia, Hook.— Heads radiate ; ra.ys fertile ; disk-flowers perfect or sometimes [both ?] infer- 

 tile. Involucre hemispherical or broadly campanulate, the lanceolate bracts imbricated in a few series, 

 the exterior smaller, margins scarious. Receptacle plane, naked or fimbrillate. Rays longer tban the 

 involucre, entire or tootbed; disk-flowers regular, tubular, tbe limb narrowly campanulate or a little 

 dilated with 5 short teeth. Anthers at base obtuse, entire. Branches of the style in the disk-flowers 

 flattened, with lanceolate appendages. Disk-aehenia compressed, those of the ray 3-angled, the scabrous 

 or barbellate pappus rigid, unequal. — Low perennial or annual herbs, more or less canescent. — Rocky 

 Mountain Region between the Saskatchewan and New Mexico. — Bentham & Hooker. 



t Dr. Gray has indicated T. scapigera, D. C. Eaton, as the nearest relative of this species. 



