178 MR. NUTTALL'S DESCRIPTIONS OF NEW 



A slender biennial, with a fusiform, simple root, about eight to ten inches high. 

 Radical leaves very hairy, pinnatifid, attenuated with slender petioles, little more 

 than an inch long. Branchlets rather long and slender, often forked ; each of the 

 slender branchlets one-flowered ; stem leaves linear, very elegantly ciliated, by white 

 pellucid bristles about a line long. Heads hemispherical; the scales of the 

 involucrum in about three series, acute, rays fifteen or sixteen, with a much shorter 

 and less copious pappus than the discal florets. Discal florets narrow and cylindric, 

 with very small teeth. Stigmas pubescent, lanceolate, with filiform terminations. 

 Pappus bright brown, by transmitted light orange or flame red, in two series, or of 

 two kinds, some of the scabrous bristles being two or three times as thick as the 

 others, which are shorter, and appear to be an outer series. The receptacle is covered 

 with rather long white acuminate palea. Achenium obovate, compressed, at first 

 multistriate ; at length the ribs are hidden with a silky villous. 



Hab. Near Santa Fe, (New Mexico.) Flowering in August. 



MICROPUS. 



M. *HETER0PHYLLUS. Annual, erect, simple, slender ; densely lanuginous above, tomentose below ; leaves 

 below linear acute, above lanceolate, obtuse and sessile ; capituli lateral and terminal, more densely 

 lanuginous ; discal florets about five, masculine three to five. 



Very nearly allied to M. angustifolius. but the heads appear larger and more 

 woolly, and the upper leaves are different.. 

 Hab. Santa Barbara, Upper California. 



POLYPAPPUS. 



P. *SERICEUS. Shrubby ; younger branches and leaves sericeous ; branches very leafy, ending in small 

 corymbose clusters of flowers ; leaves lanceolate-linear, one-nerved, entire, acute, at length nearly 

 smooth ; achenia smooth. 



A rather large shrub, the branches striate and terete, rather whitely pubescent. 

 Leaves alternate, one to one and a half inches long, one to two lines wade, crowded 

 together so as to hide the stem. Involucrum small, tomentose, campanulate, the 

 scales ovate in several series, the inner lacerate on the margin. Flowers (in the only 

 imperfect specimen I have seen,) apparently male. Receptacle flat and naked. 

 Rudimental achenia smooth and subcylindric, with five striae, and terminated by a 

 pappus of about ten rather unequal thickly clavellated hairs. Bitter and astringent 

 to the taste. 



Hab. Rocky Mountains of Upper California. 



