PLANTS COLLECTED BY DR. GAMBEL. 171 
*HELIOMERIS.+ 
Capitulum many-flowered, heterogamous; rays ligulate, in a single series, neuter ; 
discal florets tubular, hermaphrodite. Involucrum irregularly imbricated and leafy, 
in about two series, and rather spreading. Receptacle conic, the palea embracing the 
florets, lanceolate and acute. Corolla, rays ligulate, (10—12,) those of the disk 
tubular, the tube short, throat wide and cylindric, border five-toothed. Stigmata 
with oblong tips. Achenia laterally compressed, somewhat tetragonous, smooth, ani 
without any pappus. 
A perennial tall herb, exactly resembling an Helianthus, with narrow, entire, 
somewhat scabrous leaves, the lower ones opposite; flowers yellow, terminal, 
numerous. 
H. *mutrirtorvs, A stoutish perennial, three or four feet high, much branched ; stems terete and striated ; 
leaves narrow, lanceolate, entire, nearly sessile, above somewhat scabrous, opposite below, on the 
branchlets alternate; flowers terminal, numerous and showy, bright yellow, with ten to twelve 
rays, sometimes with deeper discoloured blotches towards the base or lower half, entire and oblong; 
leaflets of the calyx oblong-lanceolate, somewhat spreading, in nearly a simple series; achenia 
black and smooth. Scarcely distinguishable from J/elianthus, except by a short conic receptacle, and 
naked seeds. : 
Has. Mountains of Upper California, (Dr. Gambel,) and was also collected in the 
Rocky Mountains by Mr. Gordon. 
‘CHRYSOTHAMNUS. 
C. *pepressus. Suffruticcse and dwarf, nearly smooth; leaves rigid, lance-linear, very acute, one- 
nerved; flowers in small corymbs; involucrum closely imbricated, the scales in five rows, lanceolate, 
acutely acuminated, smooth, the lowest very small, one-nerved and somewhat carinate; pappus 
fulvous. 
Nearly allied to C. pumilus, but with a different involucrum., Achenia smooth, 
five-ribbed. 
Has. In the Sierra of Upper California. 
Chrysothamnus, by Torrey and Gray, has been referred to the genus Linosyris, of | 
the old world, with which, as I conceive, they have little if any affinity, as must appear 
on comparing the characters of the two genera. Taking L. vulgaris for the type of 
the genus, we observe that the hemispherical involucrum is scarcely imbricated, leafy 
externally, with about one row, or scarcely two, of scales, which are nearly flat; the 
florets very numerous, are very deeply divided; the stigmas are elongated; the 
summit or appendage short and ovate, much shorter than the lower or stigmatic 
portion. Pappus very copious, and scabrous, in several series, scarcely longer than 
+ In allusion to its close affnity to Helianthus, 
Aa 
