412 DESCRIPTIONS OF NEW SPECIES 



the inflorescence six to eight inches long, the lateral branches terminating in thyrsoid clusters J 

 tubular florets twenty to thirty. 



Senecio * Purshianus; % , softly and whitely tomentose, subcsespitose ; leaves 

 lanceolate-oblong, entire, cauline araplexicaule, lanceolate, incisely dentate at 

 base; corymb irregular, simple, few-flowered, the pedicels elongated, bracteo- 

 late; rays about eight; sepals about twelve, linear-lanceolate; receptacle convex! 

 achenium smooth, pentagonal, ten-striate; pappus as long as the florets. Cine- 

 rarioj integrifolia, Pursh, non Willd. Senecio integrifolius, Nutt. Gen, Am., 

 Vol. II., p. 165. 



Hab. Rocky Mountains (banks of the Platte,) also the banks of the Missouri. Allied to L. 

 tomentosus, but in that, besides other differences, the achenium is hirsutely ribbed. Nearly allied 

 to S. caniis, but with a diff"erent achenium, and stem leaves. 



Senecio suhnudus; (Decand., Vol. VI,, p. 428;) 2/, smooth; stem erect, simple, 

 with one capitulum; lower leaves long petiolate, cuneate-spathulate, obtuse, 

 denticulate, cauline sessile, the upper sublanceolate, incisely dentate at base; 

 upper part of the stem scapoid and nearly naked; capitulum subhemispherical, 

 slightly bracteolate; sepals about twenty, acumina,te; rays twelve to fifteen, 

 longer than the involucrum; achenium smooth, pappus as long as the florets. 



Hab. The Cascade Mountains on the Oregon; (the late Dr. Gairdener, from whom I received 

 the only specimen I possess.) It appears to be somewhat allied to «S'. Cymbalaria of Pursh. 

 Petiole longer than the leaf; the leaf less than an inch long, scarcely a quarter of an inch wide, the 

 uppermost reduced to slender subulate bractes. Stem eight or nine inches high, and in all the 

 specimens I saw with a solitary capitulum. 



Senecio * Cymbalarioides; 2/ , very smooth, except the axills of the leaves, 

 which are arachnoidly floccose; radical leaves cuneate-oval, very long petiolate, 

 serrate; cauline oblong, incisely serrate or subpinnatifid, narrowed below, the 

 base amplexicaule, uppermost leaves very small; corymb simple, four to eight 

 flowered; peduncles elongated, nearly naked; involucrum naked, turbinate, 

 short, of fifteen acuminate, smooth, linear-lanceolate sepals; rays about eight, 

 oblong, longer than the involucrum; achenium smooth, angular, ten-striate; 

 pappus as long as the florets. 



Hab. Iu Oregon. Allied to S. balsamitse, but with the radical leaves shorter, entire at the base, 

 on very long petioles, and with the capituli larger and fewer. Lower leaves about an incli long by 

 three quarters of an inch wide, appearing short, oval, and are mostly cuneate and entire at base ; 

 petiole two or three times as long as the leaf; at the very base within, is seen a tuft of loose 

 floccose down; the leaves themselves are exceedingly smooth and lucid. 



