GRINDELIA. COMPOSITE 295 



18. Bucephalus. Pappus copious the bristles unequal : achenes oblong, 

 compressed, villous: perennial herbs without radical leaves. 



19. Oreastrum. ' appus a single series of brownish scabrous barbellate 

 bristles : achenes subterete, 5-s-costate : acaulescent perennials with nar- 

 row entire leaves and scapiform monocephalous branches. 



20. Machieranthera. Pappus a single series of rather rigid unequal 

 bristles: achenes narrowed downward, compressed, few-nerved, the 

 faces somewhat striate: leafy-stemmed, branching biennials or annuals. 



21. Erigeron. Pappus scanty and fragile : achenes small, mostly 2-ner- 

 ved : annual or perennial herbs. 



SUBTRIBE in. BACCHAKIDEA. Heads discoid and unisexual. 

 Corplla of the fertile flowers filiform. 



22. Baccharis. Pappus copious, of fine and soft bristles, accrescent 

 after floweri i. g: achenes compressed, 5-1U c.ostate ; shrubby or herbac- 

 eous perennials. 



Subtribe 1, Homochrom'ete, Gray Syn. Fl 1, Pt. 11, 52. Disk 

 wholly of hermaphrodite flowers, of the same color as the ray when that 

 is present, mostly yellow: these corollas tubular with more or less am- 

 pliate throat and 4~5-lbed limb. Receptacle not chaffy. flat or mere- 

 ly convex. Involii,cre rloKfly imbricate, mostly in several serifs 



3 GRINDELIA Willd. Mag. Nat. Berl 1807, 259. (GuM PLANT.) 



Perennial biennial or suffrutescent plants with entire or ser- 

 rate, somewhat pellucid-punctate or reticulate leaves the radical 

 ones usually spatulate ; the canine sessile or partly clasping; 

 and middle sized or large heads of yellow flowers terminating 

 the branches. Herbage balsamic- viscid, heads many-flowered. 

 Involucre hemispherical or subglobose ;the scales imbricated, in sev- 

 eral series. Receptacle flat, foveolate Corolla of the ray ligu- 

 late, pistillate or neutral, in a single series ( in one species want- 

 ing ); of the disk tubular infundibuliform, 5-toothed, perfect: 

 branches of the style linear, rather acute, the hairy appendages as 

 long as the stigmatic portion.^ Arhenes obovate or oval, some- 

 what, angled, glabrous. Pappus of 2-8 caducous nearly smooth 

 awns or corneous bristles. 



G- integrifolia DC. Prodr v, 415 Stems rather stout, 1-3 feet high, 

 usually corymbosely branched above and bearing several or numerous 

 heads : pubescence soft villous sometimes sparse or none ; leaves of 

 soft texture, commonly entire, sometimes ser ate, cauline 3-4 inches long, 

 mostly tapering from a broad base to an acute or acuminate apex : radical 

 spatn late and obtuse: heads large, naked or surrounded by foliaceoua 

 b acts passing into leaves : bracts of the involucre with mostly elongated 

 setaceous subulate points to the bracts : achenes truncate and with an ir- 

 regular undulate or obscurely 3-5 toothed border around the terminal 

 are la; pappus awns stout, flatti&h. Along swales and ditches. Brit- 

 ish Columbia to Oregon west of the Cascade Mts Flowering .in 

 summer. 



G Henderson! Greene Pitt ii, 18. Flowering terns erect, a foot 

 high, sparsely hirsute: leaves (on sterile basal branches) 6-8 inches 

 long, blade oblanceolate, closely dentate or serrate, tapering to a 



