356 COMPOSITE. Dysodia. 



yellow or orange flowers, sometimes turning purplish or reddish. Anal. Cienc. 

 Nat. vi. 334 ; Lag. Nov. Geu. & Spec. 29 (mainly) ; Cass. Diet. xxv. 396 ; DC. 

 Prodr. v. G39 (excl. 5 and incl. Clomenocoma & Lebetina, Cass.) ; Beuth. & 

 Hook. Gen. ii. 409 (but not excl. Gymnoleena, DC.) ; Gray, Proc. Am. Acad. 

 xix. 37. Bcebera, Willd. Spec. iii. 2125. 



1). ANTHEMIDIFOLIA, Beuth. But. Sulph., of Lower California, is of a peculiar section 

 {Bteberastrum, Gray, 1. c.), with simple and more open involucre, broad conspicuous rays, style- 

 branches nearly of Bcebera, and pappus with the paleaceous part more conspicuous, the lower 

 bristles on the sides much reduced iii size. 



1. EUDYSODIA, Gray. 1. c. Involucre calyculate with some external loose 

 bracts : style-branches (at least in our species) tapering into slender-subulate 

 appendages : teeth of the corolla usually narrow : heads comparatively large, 

 pedunculate, and terminating naked branches : perennials ; ours obviously fru- 

 tescent at base, very glabrous, and with glabrous akenes which are shorter than 

 the pappus ; this of rather scanty bristles ; the receptacle minutely if at all fim- 

 brillate. 



D. Cooperi, GRAY. Stout, a foot or two high : leaves all alternate, sessile, thickish, short 

 (the larger less than inch long), from broadly ovate to lanceolate, acute, spiuulose-dentate, 

 many with a pair of stipule-like small lobes at base, mostly glandless : head broad, inch 

 high : principal bracts of the involucre 20 to 30 distinct, subulate-acuminate ; accessory ones 

 small and subulate : rays little surpassing the disk orange or turning purplish. Proc. Am. 

 Acad. ix. 201, & Bot. Calif, i. 398. Dry ravines of the Mohave Desert, S. E. California, 

 Coojier, Palmer, Lemmon, Parish. 



D. porophylloid.es, GRAY. Stems 1 to 3 feet high from a woody base, with numerous 

 spreading sleuder branches: leaves partly alternate, 3-5-parted; the lower petioled and with 

 cuneate to lanceolate entire or incised divisions ; upper sessile and the divisions linear-subu- 

 late, not setigerous : head narrower, half to three-fourths inch high : principal bracts of the 

 involucre 14 to 20, linear, abruptly acute or mucrouate, commonly slightly united below: 

 rays few and inconspicuous, yellow. PI. Thurb. in Mem. Amer. Acad. v. 322, & Bot. Calif. 

 1. c. Dry hills and mesas, S. E. California and Arizona; first coll. by Thurber. 

 D. SPECIOSA, Gray, Proc. Am. Acad. v. 163, is a species of Lower California, allied to the 

 preceding, with opposite trifoliate leaves, and mostly petiolulate leaflets. 



D. CANCELLATA, Gray, Proc. Am. Acad. xix. 38 (Lebetina, Cass.), is a species very closely 

 related to D. porophylla, DC. (aud with similar abruptly short-appendiculate style-appendages), 

 but the pappus is anomalous in having an outer series of short and blunt and wholly naked 

 palece. Common in the northern part of Mexico, reaching so near the Texan border that it 

 may be expected within it.. 



2. BC&BERA, DC., excl. spec. Involucre regularly calyculate with accessory 

 bracts : style-branches with very short conical tips : corolla-teeth short, ovate : 

 palese of the pappus multicapillary : akenes pubescent : receptacle merely pubes- 

 cent or puberulent rathe' low herbs (the two Mexican species perennials, with 

 naked-pecluncled conspicuously radiate heads) ; all with opposite pinnately divided 

 leaves, and some pubescence. 



D. chrysanthemoid.es, LAG. Much branched and ill-scented annual, leafy up to the sub- 

 sessile or short-pedunculate small heads leaves 1-2-pinnately parted into linear lobes: 

 involucre purplish-tinged or greenish, campanulate, of 8 or 10 scarious-tipped oblong bracts, 

 aud some linear loose accessory ones : rays few and inconspicuous, not surpassing the disk. 

 Nov. Gen. & Spec. 29 ; DC. 1. c. ; Torr. & Gray, Fl. ii. 362. D. glandulosa, Cav. D. fas- 

 tiijiata, DC. 1. c., excl. syu. Tai/itcs /m/i/wsa, Vent. Hort. Cels. t. 36; Michx. Fl. ii. 132. 

 Bocberachn/santhemoides, Willd. Spec. iii. 2125. B.glandulosa, Pers. Syn. ii. 459. Alluvial 

 so\\ Minnesota to Louisiana and southwest to Arizona: now spreading eastward in the 

 Atlantic States as a weed. (Mex.) 



