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 ; econ smooth, embryo 
concentric, inverted. 
Has. Rocky Mountains. (Nuttall.) 
8. MEGACEPHALUM. Leaves oblong, subelliptic ; perianth pubescent ; umbel simple. 
More dwarf than the preceding,with narrower, shorter stalked leaves, we very 
‘short, rayed, simple umbels. Perhaps a different species, but very nearly allied. 
Has. With the above. 
E. *GEenrcuLatum. Suffruticose, low and considerably branched; stems clustered ; leaves linear, somewhat 
oblong, revolute on the margin, pubescent above, tomentose beneath ; -umbles simple, of few rays, the 
involucrum of the umbel long and leafy; proper involucrum campanulate, many-flowered, 
Januginous ; the border many-cl@ft, 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 cr three rays, short, many-flowered; about half the size of the 
preceding species: embryo concentric. 
Has. In the Rocky Mountains, on the western slope. (Nuttall.) 
K. *cernuum. ©. 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 pried; at length cernuus; involucrate bractes 3-cleft, acute, appressed ; teeth of i 
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 Geni. 
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. oe 
Has. On the plains of the Oregon and in the Rocky Mountains. (Nuttall.) 
KE. *MICROTHECA. Suffruticose and dwarf; stems slend d clustered, at first arachnoid t tose ; aval 
linear-oblong, nearly smooth above, whitely tomentose beneath, sborily petiolate, the petiole widened 
at the base ; umbel two or three times di- or trichotomous, eaah division bracteate ; the involucrum 
small and distinct, pubescent, about 6-flowered; the teeth about six, ovate, chien; flowers yellow, 
very small, 
