1 70 COMPOSITiE. Corethrogyne. 



44. CORETHROGYNE, DC. {KoprjOpov, ywrj, besom-style, from the 

 brush-like tuft of bristles on the style-appendages.) — Rather low and Aster-like 

 Californian perennials, whitened, at least when young, with cottony tomentum ; 

 the stem or branches terminated by solitary somewhat large and showy heads : 

 rays violet-blue or purj)le : disk yellow, often changing to purplish : pappus 

 tawny or ferruginous : peduncles, with the bracts, &c., usually glandular under 

 the wool : leaves sessile, entire, or merely serrate. Fl. summer. — Prodr. v. 215 ; 

 Nutt. in Trans. Am. Phil. Soc. vii. 290 ; Torr. & Gray, Fl. ii. 97 ; Gray, Bot. 

 Mex. Bound. 76, Proc. Am. Acad. vii. 351, & Bot. Calif, i. 320. 



* Heads pretty large and broad, disposed to be solitary, terminating a simple stem or simple 

 branches: Involucre hemispherical, half-inch or more in diameter; its bracts little unequal and 

 outer ones largely herbaceous: style-appendages strongly comose. 



C. obovata, Bentu. Stems decumbent from spreading rootstocks, a foot or two long: 

 leaves obovate or spatulate, obtuse, siiarsely serrate or dentate above ; those of the ascending 

 brandies small, from oblong to linear-lanceolate : rays violet, varying to white suffused with 

 pink. — Bot. Sulph. 22. C. spathulatu, Gray, Proc. Am. Acad. vii. 317, & Bot. Calif. 1. c. — 

 Coast of California, from Bodegas (where it was first coll. by Hinds) to Humboldt Co., 

 Dolander, Kellogg, &c. 



C. Calif ornica, DC. Stems erect or ascending : leaves linear and entire, or the lowest 

 lanceolate-spatulate and few-toothed : sometimes a few bracts on the receptacle, like the 

 innermost of the involucre, subtending outer flowers: rays violet or purple. — Prodr. v. 215; 

 Gray, Bot. Calif, i. 321. C. Californica & C. incana (the common state, with no bracts on 

 the recei^tacle), Nutt. 1. c. ; Torr. & Gray, I. c. — California, along and near the coast, Mon- 

 terey to San Diego ; first coU. by Douglas. 



* * Heads smaller, solitary and terminating the branches, or often more numerous and loosely 

 paniculate: involucre camp nulate or broadly turbinate, much imbricated; the bracts mainly 

 appressed, outer ones successively shorter; all with short green tips: style-appendages scantily 

 comose. 



C. filaginifolia, Nutt. Stems slender, erect or ascending, a foot or two high, commonly 

 bearing few or (when depauperate) even solitary heads : leaves oblanceolate-spatulate and 

 few-toothed or entire ; upper often linear or reduced and bract-like on the branclilets ; the 

 white tomentum usually persistent, or when deciduous the branclilets and involucre little if 

 at all glandular : rays violet. — Trans. Am. Phil. Soc. vii. 290 ; Gray, Bot. Mex. Bound. 76, 

 & Bot. Calif. I.e. Aster? JilaginifoHus & A. tomentellus, Hook. & vVrn. Bot. Beech. 146. 

 Diplopappus leucophi/Uus, Lindl. in DC. v. 278. Aplopappus [PyrochMn) Hwnkei, DC. 1. c. 

 349. Coreihrogijne filaginifolia & C. tomentella, Torr. & Gray, Fl. ii. 99. — Common through 

 the western and southern parts of California from Monterey southward ; flowering at almost 

 all seasons, varying greatly. The following are the more extreme forms. 



Var. virgata, Gray. Slender, becoming glabrate and greener in age, often bearing 

 numerous heads in a very open panicle : involucre and naked branchlets disposed to be 

 glandular-viscidulous. — Bot. Calif. 1. c. C virgata,^ent\i. Bot. Sulph. 23. — Common from 

 Monterey southward ; first coll. by Hinds and by Fremont. 



Var. rigida. A stouter and rigid form, either very white-tomentose or in age gla- 

 brate, then viscidulous-glandular : leaves from spatulate-lanceolate to oval or obovate : heads 

 commonly numerous and paniculate. — C. incana, var. rigida, &c., Benth. PI. Hartw. 316. 

 C. tomentella, Durand, Pacif. K. Rep. v. App. 8. C. filaginifolia, var. tomentella, Gray, Bot. 

 Calif. 1. c, in part. — Dry and open ground, Monterev to San Bernardino Co. 

 C. det6nsa, Greene in Bull. Torr. Club, x. 41 (Bull. Calif. Acad. i. 223), appears to be 



Diplostephium {Aplostephium) canum, Gray, Proc. Am. Acad. ii. 75, of Lower Califoruia, and not 



of this genus. 



45. PSILACTIS, Gray. (*iA.o'?, naked, dKTi?, ray; no pappus to ray- 

 flowers.) — Texano-Mexican annuals, minutely pubescent, or glandular, or gla- 

 brate ; with slender and loosely paniculate-branching stems, pinnatifid or incised 

 lower leaves tapering into a petiole, and narrow often entire upper ones ; the 



