170 COMPOSITE. Corethrogyne. 



44. CORETHROG-YNE, DC. (Koprjepov, yvvrj, besom-style, from the 

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

 Californian perennials, whitenetl, 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. 8oc. vii. 290 ; Torr. & Gray, Fl. ii. 97 ; Gray, Bot. 

 Mex. Bound. 76, Proc. Am. Acad. vii. 351, & Bot. Calif, i. o20, 



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

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

 branches small, from oblong to liuear-lauceolate : rays violet, varying to white suffused with 

 pink. — Bot. Sulph. 23. C. spathulatd , Gray, Proc. Am. Acad. vii. S4-?, & Bot. Calif. 1. c. — 

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

 Bolander, K('llog(j, &c. 3^/ 



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

 lanceolate-spatulate aud 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. Califonika & 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 Doucjlas. 



* * Heads smaller, solitary and terminating the branches, or often move 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. 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 aud bract-like ou the branchlets ; the 

 white tomentum usually persistent, or when deciduous the brajichlets aud involucre little if 

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

 & Bot. Calif. 1. c. Aster ? Jilaginifolius & A. toincnteUus, Hook. & Arn. Bot. Beech. 146. 

 DIplopappus leucophi/llus, Lindl. iu DC. v. 278. Aplopappus {Pi/rorlmtn) Ilaiikei, DC. 1. c. 

 349. Corethror/i/iie JilcH/iui/oIiu & C. iomentdlu, Torr. & Gray, Fl. ii. 99. — Common tlirough 

 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 lieads iu a very open panicle : involucre and naked branchlets disposed to be 

 glaudular-viscidulous. — Bot. Calif. 1. c. C. zvVr/«<f/, Benth. Bot. Sulijh. 23. — Common from 

 Mouterey southward-; first coll. by Hinds and by Fremont. 



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

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

 commonly numerous aud paniculate. — C. incana, \av. ritjida, &c., Benth. PI. HartAV. 316. 

 C. tomentella, Durand, Pacif. R. Eep. v. App. 8. C. Ji/affinifolia, var. tmnentella, Gmy, Bot. 

 Calif. 1. c, iu part. — Dry aud open grouud, Monterey to San Bernardino Co. 

 C. det6xsa, Greene in Bull. Torr. Club, x. 41, of uncertain origin, probably Lower Cali- 

 fornia, may be a form of the last variety. |-|/lu,1c t«.^^» , S Cvv\.-« X.J . 



45. PSILiACTIS, Gray. (4'tAo'?, naked, d/cri?, ray; no pappus to ray- 

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

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

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



