186 COMPOSlTiE. TowNSENDiA. 



hairy; pappus of the ray composed of nearly equal subulate setaceous bris- 

 tles, shorter than the acheniura. — Nutt. I in trans. Amer. jihil. soc. I. c. 

 p. 305. 



Near the sources of the Platte in the Rocky Mountains, Nultall! — Plant 

 about 2 inches high, densely csespitose and depressed, inclined to produce di- 

 chotomous stems. Leaves about half an inch long, indistinctly petioled. 

 Heads smaller than in T. sericea. Scales of the involucre silky-pubescent, 

 with broad scarious and conspicuously fimbriate-ciliate margins. Rays not 

 twice the length of the disk, pale lilac ; the pappus resembling that of the 

 disk, but shorter. 



§ 2. Root perennial : pappus deciduous in a ring ; that of the scarcely 

 serted fertile rays equalling that of the disk. — Urcphorus, Nutt. 



ex- 



3. T. spathulata (Nutt. ! 1. c.) : densely csespitose ; caudex branched ; 

 leaves spaiulate or obovate, silky-villous, narrowed into a petiole as long as 

 the limb, crowded, and nearly enclosing the (small) sessile heads ; scales of 

 the involucre lanceolate, acute, scarious ; receptacle somewhat alveolate. 



On the Black Hills of the Platte, witli the preceding, Nuttall! — Plant 1-3 

 inches high. "Achenia oblanceolate, margined, slightly pubescent on the 

 disk, and usually naked by the escape of the deciduous (barbellate) pappus, 

 which is not the case in any of the preceding. Though the habit is nearly 

 similar, the present plant probably constitutes an allied genus." JSutt. — Our 

 specimens are too old, and have lost their achenia as well as pappus. Per- 

 haps the latter is also deciduous in the other species, when the fruit is fully 

 mature. 



§ 3. Root annual, thickened at the summit, and producing depressed branch- 

 ing stems : rays pistillate but infertile ; the short pappus composed oflacerate- 

 denticulate squamella, often somewhat united at the base. — Nanastrum. 

 (Subgen. Nanodia, Nutt., not o^ Banks.) 



4. T. strigosa (Nutt. ! 1. c.) : depressed ; leaves strigose-canescent, linear- 

 spatulate ; the uppermost often involucrate around the base of the slightly 

 pedunculate heads; scales of the involucre lanceolate-oblong, fimbriate-cili- 

 olate ; rays 12-14 (rose-color), short ; achenia minutely pubescent. 



Black Hills, near the banks of the Platte, Nuttall ! June.— Plant 2-4 

 inches high. Heads scarcely as large as in T. sericea. Scales of the invo- 

 lucre scarious, except the greenish line in the centre. Pappus of the ray 

 barely visible to the naked eye, composed of a single series of squaraelte, 

 somewhat united or coroniform. 



5. T. grandiflora (Nutt. ! 1. c.) : divaricately branched from the base ; the 

 branches depressed, often proliferous ; leaves scattered, linear-lanceolate, 

 acute, minutely pubescent ; the uppermost bracteate at the base of the (large) 

 heads ; scales of the involucre narrowly lanceolate, subulate-acuminate, with 

 fimbriate-ciliolate margins ; rays 25-30, elongated (pale lilac) ; achenia mi- 

 nutely hairy. 



Black Hills, and plains of the Upper Platte, Nuttall ! Dr. James ! June. — 

 Central stems short, erect, bearing a single head ; the lateral decumbent, ex- 

 tending 5 to 10 inches along the ground, often branching and bearing 3 or 4 

 heads. Leaves 1-2 inches long, somewhat succulent; the cauline alternate. 

 •' Heads nearly as large as those of the China Aster. The plant well de- 

 serves cultivation, from its large showy flowers." Nuttall. — The pappus 

 is very similar to that of the preceding species. 



