C. GRAMINEUS — C. VASEYI. 179 



the single known species of the genus, which has flattish 5-nerved achenes, punctate 

 leaves, and other characters not found in gramineus. The latter is almost exactly 

 matched in foliage characters by a plant collected in southern Utah by Jones and named 

 by him as Bigelovia menziesi var. scopulorum (Proc. Calif. Acad. II, 692, 1895). While 

 great importance can not be attached to leaf characters, the similarity in this instance 

 may be of more than ordinary significance, for the type of leaf is entirely different from 

 that of any other Chrysothmnnus, or indeed from that of any member of any closely 

 related genus. Professor Jones's variety was later taken by Greene as the type of his 

 new genus Hesperodoria (Greene, Leaflets 1:173, 1906). Still later it was referred to 

 Isocoma as /. scopulorum (Rydberg, Fl. Rocky Mts. 859, 1917). Thus, it has always 

 been considered a member of the Haplopappus group of genera or subgenera rather than 

 of Chrysothamnus. The present emphasis upon the similarity between its foliage and 

 that of C. gramineus should not be taken as more than suggestive, unless additional 

 evidence is found as to their consanguinity. The heads in scopulorum are turbinate, 

 rather than subcylindric, as in gramineus, the flowers are nearly twice as long and more 

 than twice as numerous, and the achenes are 4- or 5-angled and densely hispid, as con- 

 trasted with the glabrous, lO-striate achenes of gramineus. 



The conclusion, therefore, is that, although C. gramineus is anomalous in Chrysothamnus, 

 chiefly because of the peculiar foliage and the lack of a vertical arrangement of its bracts, 

 it would be still more aliomalous in any other genus, and, furthermore, the cylindric 

 involucre and the presence of similar achenes in other undoubted members of the genus 

 leave no alternative to its acceptance as a member of Chrysothamnus. 



ECOLOGY AND USES. 



Chrysothamnus gramineus is an exceedingly rare undershrub, flowering from August 

 to October. It grows in yellow-pine savannah as a secondary species, but is altogether 

 too sparse to be of importance in the community. It has no known uses. 



4. CHRYSOTHAMNUS VASEYI (Gray) Greene, Erythea, 3:96, 1895. Plate 25. 



Shrub 1 to 3 dm. high, single-stemmed at base, but soon branching to form a low, 

 rounded bush; bark of old stems brown, fibrous; twigs brittle, erect or ascending with a 

 pale green or whitish glabrous bark; leaves linear or very narrowly oblanceolate, flat 

 but sometimes twisted, obtuse, 1 to 2.5 cm. long, 1 to 2.5 mm. wide, l-nerved, firm, 

 glabrous but resinous-glandular; heads in small, compact cymes; involucre 5.5 to 7 mm. 

 high; bracts about 15, the vertical ranks vaguely defined, oblong, obtuse, obscurely 

 keeled, glabrous but viscid-glandular and with the thin white margins erose or ciliolate, 

 the outer ones with a thickened greenish spot near the apex; flowers 5 to 7; corolla tubular- 

 funnelform, passing gradually from a narrow tube to a much wider throat, 5.5 to 6.5 mm. 

 long, glabrous or only minutely granular; lobes linear-lanceolate, 1.5 to 2 mm. long, more 

 or less spreading, glabrous; anther-tips lanceolate, acute, 0.5 to 0.8 mm. long; style- 

 branches slightly exserted, the thick appendage usually shorter than or only slightly 

 exceeding the stigmatic portion; achenes terete- turbinate, about 5 mm. long, longitud- 

 inally striate with about 10 nerves, glabrous or rarely with a very sparse pubescence near 

 summit, smooth and shining or only minutely granular; pappus scant, soft, shorter than 

 the mature corolla, dull white. (Bigelovia vaseyi Gray, Proc. Am. Acad. 12:58, 1876.) 



In mountain valleys and on hillsides from southern Wyoming and New Mexico 

 to Utah. Type locality, Colorado, in Middle Park. Collections: Laramie Hills, 

 Wyoming, Nelson 6331 (Gr, NY, US); type collection, 1868, Vasey (Gr, US); 

 Ridgway, Ouray County, Colorado, Pay son 2315 (SF); Gunnison, Colorado, Baker 673 

 (DS, Gr, NY, UC, US); Montezuma Canon, southeastern Utah, Rydberg and Garrett 

 9679 (NY, UC, US) ; Panguitch Lake, Utah, Jones 5998 (NY^ UC, US); slope of Aquarius 



