coLBOSANTHUs. COMPOSITE 293 



heads large, solitary, on elongated somewhat leafy branches : involucre 

 40-5v -flowered, the scales in several series, outer ones ovate, inner ones 

 linear, acute, style-branches olub-shaped, exeerted: achenes with a double 

 row of minute bristles along the striae not glandular : pappus obscurely 

 plumose. Sandy bottoms and rocky gulches, eastern Washington to Utah. 



■<- -t- Barely pubescent or glabrate perennials: heads not viscid: 

 leaves slender-petioled, at least the lower ones opposite. 



C. g'randlflorns Ktze. 1 c. BrickelUa .grandijlora Nutt. Puber- 

 ulent or almost glabrous: stems 2-3 feet high, paniculately branched: 

 leaves broadly or narrowly deltoid-cordate or the upper deltoid-lanceolate, 

 coarsely dentate-serrate with an entire usually acuminate apex, 1-4 inches 

 long : involucre about 40-flow;ered, its bracts papery and scarious when 

 dried, the short outer ones ovate, the inner ones oblong-linear, obtuse or 

 acutish or some exterior ones with loose subulate acuminations: pappus 

 white ; achenes sparingly setulose toward the summit. On hills albrg 

 streams, Oregon .to the Sierra Nevadas Montana and Arizona. 



* * Heads 3-25-flowered not over 6 lines long: pappus-lristles 

 scabrous or not manifestly barbellate : heads sessile or short-pedun- 

 cled, terminating short leafy branchlets or in axillary clusters forming 

 a spiciform paniculate or interrupted thyrsus. 



■>- Involucre naked at base, all the bracts dry and chartaceous, 

 glabrous and smooth, the outermost short and appressed, wholly des- 

 ' titute of green tips 



C. ( allfornicus Ktze. 1. c. BrichelUa Californica Gray, Minutely 

 puberulent: stems 2-3 feet high; virgately branched: leaves ovate, obtuse, 

 rarely subcordate, somewhat crenate-dentate, commonly an inch or less 

 long, mostly surpassed by the small clusters of heads, these rather spic- 

 ately glomerate, forming an uninterrupted strict thyrsus : in volucral br- 

 acts all obtuse or the innermost linear ones abruptly acute, short outer- 

 most ones oval and ovate : heads 10-20-flowered, 4-5 lines high. On rocky 

 banks of the Eogue Biver to California, Nevada and Arizona. 



*■ -I- Involucre of firmer bracts the outer with greenish and some- 

 what spreading tips, outermost loose and herbaceous and passing into 

 the small leaves of the branchlets. 



C. iiiicrophyllns O. Ktze, 1. c. BrickeUia microphylla Gray Viscidly 

 pubescent and glandular: stems 12-18 inches high, much branched from a 

 woody base: leaves alternate, short petioled, ovate, coarsely toSthed 4-7 

 lines long, those of the branchlets much smaller and sessile, heads small, 

 16-20-iiowered, clustered at the end of the branchlets : involucral bracts ' 

 imbricated, in many rows outer ones ovate, herbaceous with squarrosetips, 

 inner ones erect, lanceolate, acute : pappas scabrous : achenes slightly setu- 

 lose. Eastern Oregon to California, Nevada, Colorado and Montana. 



Tribe ll.ASTEROIDEyE. Heads either heterogamous and radiate, 

 the ligulate ray fiovjers feminine or rarely neutral, or homogamous 

 with the flowers all hermaphrodite and tubular or rarely the female 

 flowers with filiform, corolla and no ligule or in Baccharis dio-.cious 

 and the female corollas all filiform. Receptacle seldom paleaceous. 

 Corolla of the hermaphrodite flowers regularly 6-lobed, rarely 4~ 

 lobed. Anthers obtuse and entire or barely emarginate at base. 

 Style branches of hermaphrodite flowers flattened, conspicuously 

 margined by the stigrnatic lines, and extending into a hispid or 

 papillose apperldage. Pappus various or sometimes none. Leaves 

 mostly alternoite. Dish flowers usually yellow. 



