1 70 COMPOSITE. Corethrogyne. 



44. CORETHIlOG-YNE, DC. (KoprjOpov, yvvrj, 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 purple : 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-appeudages strongly comose. 



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

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

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

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

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

 Bolander, 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 receptacle), Nutt. 1. c. ; Torr. & Gray, 1. c. — California, along and near the coast, Mon- 

 terey to San Diego ; first coll. by Douglas. 



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

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

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

 comose. 



C. fllaginifolia, 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 branchlets ; the 

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

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

 & Bot. Calif. 1. c. Aster ? filaginifolius & A. tomentellus, Hook. & Arn. Bot. Beech. 146. 

 Diplopappus leucophyllus, Lindl. in DC. v. 278. Aplopappus (Pyrochozta) Hcenkei, DC. 1. c. 

 349. Corethrogyne jilaginifolia & C. tomentetta, Torr. & Gray, PI. 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, Gkay. 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, Benth. 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. tomentetta, Durand, Pacif. E. Hep. v. App. 8. C. Jilaginifolia, var. tomentetta, Gray, Bot. 

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

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



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



of this genus. 



45. PSILACTIS, Gray. (tftAo's, naked, <Ws, ray; no pappus to ray- 

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

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

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



