Sericocar2)us. COMPOSITiE. 171 



heads small, terminating the branches, with violet or purplish or white rays ; 

 these usually infertile: fl. summer. — PI. Fendl. 71; Benth. & Hook. Gen. 

 ii. 20'J. 



P. Coulteri, Grat, 1. c. Branched from near the base, glaljrous or obscurely hispichilous- 

 pulierulent, or the rigid spreading flowering brauchlets granulose-ghandular : leaves all short, 

 rigiil, mostly incisely dentate, those of the brauchlets minute : involucral bracts oblong or 

 broadly lanceolate : rays conspicuous (cjuarter-iuch long) aud rather broad: pappus copious. 

 — S. Arizona, Palmer, Lcnimon, Priiujle, &c. Mohave IJesert, California, Parish, Coulter, &c. 

 (Adj. Mex.) 



P. asteroides, Gray, 1. c. Scabropuberulent, a foot to a yard high from a plainly annual 

 root . lower leaves spatulate or oblong, sometimes laciuiate-pinnatitid, sometimes barely 

 dentate ; upper mostly linear and entire ; involucral bracts lanceolate or linear : rays smaller 

 and narrower: pappus less copious. — S. W. Texas to Arizoua, \V rigid, &c. (Adj. Mex.) 

 P. BREViLiNGULATA, Scliultz Bip., of Mexico, the remaining species, resembles P. asteroides, 



but is more slender, with narrower leaves, smaller heads, and small rays which hardly surjjass 



the pappus. 



46. EREMlASTRUM, Gray. ('Ep^/xto, desert, ao-rpov, star, i. e. Aster 

 of the desert.) — PI. Thurb. in Mem. Acad. v. 320 ; Benth. & Hook. Gen. ii. 270. 

 — Single species. 



E. bellioid.es, Gray, 1. c. Small winter annual, diffusely branched from the very base and 

 depressed, hirsutely liispid througliout : leaves liuear-spatulate, entire (half-inch long) ; those 

 at the summit of the flowering branches loosely rosulate-involucrate around the solitary 

 heads, and passing into involucral bracts : rays oblong-linear, white, acutely 2-.3-dentate 

 at the apex, 4 lines long : disk yellow. — (Ju the desert near the Rio Colorado, borders of 

 California and Arizona; fl. January and February, Thurber, Newberrij, Schott, Palmer, W. G. 

 Wrifjht, &.C., and borders of S. Utah, Parry. — Seldom, if ever, are the bristles of the pap- 

 pus combined iu clusters so as to form laciniate palese. 



47. SERICOCARPUS, Nees. (Si^ptKo?, silky, KapTro's, fruit, the akenes 

 sericeous-pilose.) — Perennial herbs, of low or moderate stature (all N.American); 

 with alternate commonly entire and sessile leaves, and small heads usually fasci- 

 cled in a terminal compact cyme ; both disk and ray white or whitish, or the 

 latter changing in age to jxirplish : fl. midsummer. — Nees, Ast. 148 ; DC. Prodr. 

 V. 201 ; Torr. & Gray, Fl. ii. 101 ; Benth. & Hook. Gen. ii. 270. 



* Pappus ferruginous: leaves sparingly serrate, comparatively thin and veiny, and tlie radical 

 ones larije. 



S. COnyzoid.es, Nees, 1. c. A foot or two high, and .slightly pubescent or glabrate: radical 

 and lower cauline leaves spatulate (2 to 5 inches long, tapering into a margined petiole), 

 obtuse ; upper ones oblong-lanceolate: involucre turbinate, 18-20-flowered : rays ratlier short 

 and broad. — Cont/za asteroides, L. Spec. ii. 861. Aster Mar ijlundicus (Pluk. Mant.), Michx. 

 n. ii. 108. A. conyzoides, Willd. Spec. iii. 2043. — Dry woodlands, common from Maine to 

 Ohio aud south to Florida. 



* * Pappus white: leaves entire, firmer, smaller, obscurely veined, disposed to be vertical, mostly 

 obtuse: green tips of involucral bracts short, seldom squarrose: stems more leafy. 



-t— Atlantic species : akenes short, canescent-sericeous. 

 S. solidagineus, Nees, 1. c. Green, almost glabrous : stems strict and slender, 2 feet 

 higli, acutely striate-angled : leaves from linear to spatulate-lanceolate, an inch or two long ; 

 heails mostly glomerate and sessile, narrow, rather few-flowered : involucral bracts oblong, 

 very smooth and rigid : rays at length elongated. — Conjjza linijolta, L., 1. c. Aster Ameri- 

 cainis albus, &c., Pluk. Aim. t. 79, fig. 2. A. solidagineus, Michx 1. c. A. solidagnioides, 

 Willd. 1. c. Galatella obtusifolia, Lehm. lud. Sem. Hamb. 1837. — Moist woodlands, Canada 

 to Tennessee, Alabama, aud Louisiana. 



