368 coMrosiT^. 



in^ly leafy, the branches white with a dense tomentum: leaves viscidly 

 glandular, not woolly: heads mostly solitary, nearly an inch high, ray- 

 less; involucre of few bracts.— Subalpine or alpine in the Sierra Nevada? 

 and far eastward. Aug., Sept. 



13. CHRYSOTHA.M\US,iV"tt«<aZ;. (Rabbit Bush). Shrubby or half- 

 shrubby plants, with very narrow entire subcoriaceous foliage, both 

 stem and leaves sometimes white with a pannose tomentum. Heads 

 numerous and narrow, seldom with rays, the bracts of the involucre 

 narrow, commonly in 4 or 5 vertical ranks. Corollas slender, somewhat 

 funuelform or claviform, with spreading or suberect teeth. Style-tips 

 lanceolate-subulate to filiform. Achenes narrow, not compressed. Pap- 

 pus of subequal bristles. 



* Destitute of tomentum, sometimes puherulent; heads and achenes rather 

 short; slyle-lips not exceeding the stigmatic portion. 



1. C. pnberulus, Greene, Eryth. iii. 9.3 (1895). Erect and with short 

 fastigiate leafy branches, % — 1 f*- l>iRli, the foliage and twigs from 

 scabro-puberulent to hispidulous: leaves from spatulate-linear to linear, 

 1-nerved, I4 — 1 in. long, often serrulate-scabrous on the margin: heads 

 in small clusters at the ends of the many bran chiefs; involucre barely 3 

 lines high, its bracts obtusish, mucronulate.— Eastern base of the Sierra, 

 toward the borders of Nevada. July — Sept. 



2. C. stenopliyllus, Greene, 1. c. 94. More densely tufted than the 

 last, more leafy, the cymes larger and fastigiate: bark of branches very 

 white and shining: leaves narrowly linear, acute, 1-nerved, their margins 

 serrulate-scabrous, otherwise glabrous : involucre narrow, its bracts 

 more distinctly 4-ranked, seldom or never mucrouate. — Habitat of the 

 last. July— Sept. 



3. C. tortifoliiis. Bigelovia Douglasii, var. tortifolia, Gray. Shrub 

 2 — 4 ft. high, the stout leafy branches with a smooth very white bark 

 and terminating in a broad compound fastigiate-cymose cluster of 

 heads: leaves oblong-linear or lanceolate, very acute, about 2 in. long, 

 distinctly 3-nerved, often twisted, the margin serrulate-scabrous, other- 

 wise usually glabrous: heads about 4 lines high, the linear-oblong 

 obtuse bracts distinctly 4-ranked.— Hills along the Truckee River, 

 Sonne, and plains of Lassen Co., Mrs. Austin. Sept. 



4. C. humilis, Greene, Pittonia, iii. 24 (1895). Depressed, only 6—8 

 in. high, much branched ; cinereous-puberulent throughout : leaves 

 rather sparse, suberect, 1 in. long, narrowly oblanceolate, acute: heads 

 in small terminal clusters, subsessile, 4 lines high; bracts about 3 in each 

 vertical rank, lanceolate, with greenish obtuse delicately ciliolate tips: 



