428 DESCRIPTIONS OF NEW SPECIES 



linear-subulate, minute; stem much branched, erect or flexuous; flowers soli- 

 tary, terminal ; scales of the caliculum lanceolate, acute. 



Hab. On the borders of Big Sandy creek, a rivulet of the Colorado of the West. A low species, 

 about a span high, with a large tortuous root; the upper leaves reduced to mere scales. Sepals 

 lanceolate. Stem scarcely striated. 



Stephanomeria *runcinata; %, radical, and often the stem leaves runcinate- 

 pinnatifid, more or less pubescent, the lower part of the stem scabrous; upper 

 leaves linear ; branches short and somewhat spreading, one-flowered ; involu- 

 crum six-leaved, six-flowered; sepals linear-oblong; pappus white, of about 

 twenty rays; achenium nearly even. 



Hab. With the above, which it nearly resembles, but has larger capituli, shorter branches, and 

 generally more of the runcinate leaves. Flowers, as in the preceding, rose-red. Height about 

 seven or eight inches. Pappus white and rather long. Infertile branches clad to the summit with 

 leaves, which are more deeply runcinate-pinnatifid as they approach the extremity. 



t Annual species, divaricately branched; achenium pentangular, transversely ru- 

 gose, obscurely ribbed. 



Stephanomeria * paniculata; Ql smooth and glaucous; stem tall, stout and 

 erect, cylindric and striated, virgately branched; flowering branches short and 

 axillary, somewhat paniculate or virgate; leaves linear, dentate or sagittate at 

 the base; segments of the caliculum or bractes oblong and small; pappus gray, 

 of about fifteen to twenty rajs. 



Hab. On the Rocky Mountain plains, towards the Colorado. Stem rigid and stout, two or more 

 feet high, virgately branched. Pedicels very short and leafy, axillar. Flowers very small, pink 

 red, and pale. The leaves and involucrum are frequently incrusted with clear drops, of a very 

 bitter resin. Achenium straw-coloured, linear, transversely rugose, and pentangular; the ribs de- 

 pressed. 



[ Stephano?neria ^exigua; O, glaucous and smooth; branches divaricate, very 

 slender and numerous; radical leaves runcinate-pinnatifid; the cauline resem- 

 bling mere scales ; flowers lateral and terminal, on long bracteolate branchlets ; 

 involucrum three to four-leaved, three to four-flowered ; pappus white, of fifteen 



to eighteen rays. 



Hab. With the preceding. With divaricate, and almost capillary branchlets; scales of the 

 caliculum about three, lanceolate, minute. Flowers pale red, and small. Achenium pentangular, 

 with acute angles, and transversely rugose sutures. Minute leaves, often denticulate at the base. 

 Pappus with small intercallary simple hairs. 



