162 MR. NUTTALL'S DESCRIPTIONS OF NEW 



A low suffruticose plant, with infertile leafy branchlets at its base, with a woody 

 caudex. Leaves about an inch long, attenuated into a longish petiole, with scape-like 

 flower stems, terminating in twice compounded umbels, all of them subtended by 

 leafy bractes; bractes also appear on the partial pedicles below the flowering summit 

 The involucrum almost cup-shaped, and shallow, with its leafy divisions reflected; 

 flowers bright yellow, and very large and showy ; oblanceolate very much attenuated 

 to the jointed peduncle ; filaments pubescent at the base ; achenium smooth, embryo 

 concentric, inverted. 



Hab. Rocky Mountains. (Nuttall.) 



/S. MEGACEPHALUM. Leaves oblong, subelliptic ; perianth pubescent ; umbel simple. 



More dwarf than the preceding, with narrower, shorter stalked leaves, and very 

 .short, rayed, simple umbels. Perhaps a different species, but very nearly allied. 



Hab. With the above. 



E. *GENicoLATUM. Suffruticose, low and Considerably branched ; stems clustered ; leaves linear, somewhat 

 oblong, revolute on the margin, pubescent above, tomentose beneath ; umbels simple, of few rays, the 

 involucrum of the umbel long and leafy ; proper involucrum campanulate, many-flowered, 

 lanuginous ; the border many-cleft, the divisions spreading and nearly as long as the cup ; flowers 

 yellow, numerous and small, obconic, externally pubescent towards the base. 



A small shrub or suffrutex, about a span high ; the branches clustered ; with knots 

 and decayed sphacelous remains on the lower part ; leaves small and clustered ; 

 umbel of only two or three rays, short, many-flowered ; about half the size of the 

 preceding species ; embryo concentric. 



Hab. In the Rocky Mountains, on the western slope. (Nuttall.) 



E. *CERNUUM. O- Leaves all radical, round oval, upon longish petioles, very whitely tomentose beneath, 

 less so above ; scape smooth, two or three times dichotomous ;. involucres solitary, pedicellate, smooth; 

 pedicels exserted, at length cernuus ; involucrate bractes 3-cleft, acute, appressed ; teeth of the 

 involucrum acute ; flowers few and small; segments of the perianth undulated. 



A rather small species, eight to ten inches high ; leaves about half an inch long and 

 nearly the same width ; pedicels about half an inch long, reflected after inflorescence; 

 involucres minute, campanulate, about six to eight- flowered, the flowers brownish, 

 smooth ; the segments of the perianth with whitish, undulated margins ; stamens 

 three ? caryops roundish at the base, with a minutely scabrous 3-sided attenuated 

 summit. Probably dioicous. 



Hab. On the plains of the Oregon and in the Rocky Mountains. (Nuttall.) 



E. *Micp>,oTHECA. Suffruticose and dwarf: stems slender and clustered, at first arachnoid tomentose ; leaves 

 linear-oblong, nearly smooth above, whitely tomentose beneath, shortly petiolate, the petiole widened 

 at the base ; umbel two or three times di- or trichotomous, each division bracteate ; the involucrum 

 small and distinct, pubescent, about 6-flowered ; the teeth about six, ovate, obtuse ; flowers yellow, 

 very small. 



