AND GENERA OF PLANTS. ' 305 



Hab. On the Black Hills, (an alpine chain toward the sources of the Platte.) Flowering pro- 

 bably in April. By the achenium, this genus makes some approach to Calimeris, though totally 

 nnlike in habit. 



Townsendia *incana; whitely canescent; many-stemmed, csespitose; leaves 

 linear-spathulate, somewhat acute, scales of the involucrum lanceolate, ciliate ; 

 pappus of the rays short. 



Hab. With the above. Flowering in June. Stem very short, depressed and dichotomous. 

 Flowers sessile. Rays pale lilac. Florets numerous. Pappus of about twenty-four almost plu- 

 mose rays, connected together in a ring, broad below, and attenuated gradually above. Rays about 

 twelve; three-toothed, with a short, nearly equal, barbellate pappus, similar to that of the herma- 

 phrodite florets, except its shorter length. Stigmas of the rays slender, filiform, smooth, of the 

 tubular slightly five-toothed discal florets included, lanceolate, a little hirsute, (as in Aster.) Ache- 

 nium flat and margined, thinly clothed with glandular hairs. 



Subgenus. — * Urophorus. , 



Pappus of the rays and disk equal, acuminate, and plumosely harhellate, connected 

 into a ring above the base, deciduous. — Perhaps a genus ? 



Torvnsendia * spathulata; csespitose, many-stemmed, canescently and softly 

 tomentose; leaves spathulate obtuse; scales of the involucrum lanceolate-oblong, 

 fimbriate. 



Hab. With the above. Perennial, like all the preceding, also equally caespitose, with the 

 leaves in dense clusters, forming circular tufts; the flowers, also, equally solitary and sessile. The 

 whole dwarf plant has much the aspect of the one-flowered variety of Gnaplialium supinum; flow- 

 ers very inconspicuous ; the capitulum almost imbedded in the clustered leaves. The leaves are 

 broader than in the preceding, the liguli but little longer than the pappus, and scarcely exserted 

 beyond the involucmra. Achenia oblanceolate, margined, slightly pubescent on the disk, and usu- 

 ally naked by the escape of the deciduous pappus, which is not the case in any of the preceding. 

 Though the habit is wholly similar, the present plant probably constitutes an allied genus. By 

 the pappus and achenium this small tribe of AsteroidejE seem to approach the CarduinevE. 



Subgenus. — ^NANODiA.f 



With the rays infertile or neuter, flat and exserted, usually three-toothed. 

 Pappus of the infertile ray very short, even; that of the discal florets scarcely 

 deciduous. Receptacle flat, alveolate-punctate, fimbrillate. Achenium com- 



t In allusion to its dwarf appearance. 

 VII. — 4 B 



