148 



BOTANY. 



Townsendia* Eothrockii, Gray,f m herb. — Perennial, stemless; 

 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 nearly 

 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 ; rays 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 than the 

 involucre, entire or toothed; disk- flowers regular, tubular, the 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-achenia 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. — Bbntham & Hooker. 



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



