Dysodia. COMPOSIT.E. 



o-J-J 



* * rorennial (as to X. American species), vnih narrow entire sessile leaves, glaueescent, much 

 branched, 1 to 3 feet high. 



P. gracile, Bexth. I.i^'nescent at base, with slender striate branches : odor pungent, "Fen- 

 nel-like " : leaves narrowly linear with tapering base, or uppermost filiform or subulate, or all 

 filiform : involucre cvlindraceous, half-inch long; its hracts 5, oblong or linear-oblong, obtu-e, 

 scarious-mar^ined, often slightly purple-tinged : corollas dull «hite and purple, with tube as 

 long as the uarrowish throat and short triangular-lanceolate lobes : akenes attenuate at apex, 

 rather longer than the pappus. — But Sulph. 29 ; Gray, Bot. Calif, i. 399. P. Gn-ii,,::. Gray, 

 PI. Wright, i. \M. in part, & ii. <J4. ^ Arid plains, S. W. Texas to San Dieao Co., California. 

 (Lower Calif., .Vdj. Jlex.) 



P. SCOparium, Gr.it. shrubby at base, with slender rush-like branches: leaves thick and 

 firm, linear-subulate and filiform, narrow at lia-e, mucronate-apiculate : involucre campanu- 

 late, 4 or J lines high, of 7 to 9 hroadly lanceolate greenish bracts, one third to half shorter 

 than the mature pappus: coruUas yellow, with very short obtuse teeth, and narrow throat 

 much longer than the proper tube (i. e. Ijelow- the insertion of the stamens) : akeues not at- 

 tenuate at apex, fully equalled by the jiappus. — PI. Wright, i. 1 iO. ii. 94, & Proc. Am. Acad, 

 xviii. 108. P. Greffijii, Gray, PI. Wriglit. 1. c, as to pi. Gregs, a stouter form. — Eocky 

 banks and plains, S. W. Texas and Xew ilexico; first coll. by Wright. V,'. borders of 

 Texas, Havard. (Adj. Mex.) 

 P. AMPLExiC-\rLE, Eugelm. in PI. TVright. 1. c, of adjacent ^lexico, is stouter, less branched, 



with S'.tlitary and larger Iieads. and fleshy-coriaceous leaves lanceolate, tapering from a partly 



clasping base, all but the uppermost opposite : bracts of the involucre S to 10, half-inch long. 



- 164. CHRYS ACTINIA, Gray. {Xpvaoi. gold, Akt^s, ray. from the 

 golden yellow ray.?, which distinguish the genu.? from the preceding.) — PI. Fendl. 

 93, & PI. AVright. i. 11 'J. — .Single species, with i-n.^inous-aromatic odor. 



■ C. Mexicana, Ge.vt, 1. c. Fruticulose, about a foot high from a stout base, much branched, 

 very leafy : leaves alternate. Heath-like, thick or almost terete, sliort-linear or filiform, with 

 narrowed base, cuspidate-mucronate, entire, with abundant round oil-glands: heads on slen- 

 der peduncles terminating the branches, a third of an inch high: bracts of the involucre 

 lanceolate, hardly longer than the akenes, usually bearing a single large and prominent 

 infra-apical oil-gland : disk-corollas with short proper tube and long cylindrical throat (in 

 the way of Pviifli/Uum scopariuin and P. amplexicaule) : akenes shorter than the pappus. — 

 llocky ground, V,'. Texas and adjacent New Jlexico; first coU. by Gregrj. (ilex.) 



165. NICOLL.ETIA, Gray. (Memory of /. X. X(Vo?te, astronomer and 

 explorer of the region between Upper Mississippi and Missouri Rivers.) — Two 

 low annuals ; with alternate leaves irregularly pinnately parted, and leafy branches 

 terminated by large heads of purple or flesh-colored flowers, or disk-corolla.s at first 

 yellow. — Rep. Fremont 2d Exped. 31.3, PI. Wright, i. 110. eV- Bot. Calif, i. 3'J8. 



' N. occidentalis, Gp,.iv, 1. c. stout, somewhat fleshy, a foot or two high : branches leafy 

 up to the liead : lea^-es with numerous or se^■eral >liort lanceolate-subulate or linear setosely 

 tipped lobes: involucre three-fourths inch long, of S to 12 bracts : ligtiles oblong, little sur- 

 ]iassiDg the disk. — Sandy banks and plains of the ilohave Desert re-ion, S. E. California; 

 first te'll. by Fremont, who made liis earliest exploration under XicoUet. 

 N. Bdwardsii, Grat. ilore slender, a span or two high: leaves attenuate-linear, few-- 

 lobed : heads somen hat naked-pedunculate ; involucre turbinate at base, half-inch long, of 

 S or 9 Ijraets: Ii gules much exserted, elongated-oblong, dentate or denticulate at the truncate 

 simimit, commonly half-inch long. —PI. Wriiilit. i. 119, t. S. & Bot. Jlex. Bound. 9.3.— 

 s.uidy banks and" plains, S. W. Texas and adjacent Xew Mexico, Bigeloic, Parrj. (Adj. 

 :Mex.", Dr. Edwards, Palmer. Lower Calif., Sireets.) 



166. DYSODIA, Car., as Di/ssocUa. \\va-ahia, an ill smell.) — Herbs or 

 snffrutescent plants, of X. America and Mexico, mostly strong-scented; with 

 alternate or opposite leaves, and solitary or rarely somewhat paniculate heads of 



