^•sf'^'"- COMPOSIT.E. 203 



sp-is? carnosa, Gra.y, PI. Wright, ii. 80. Diji.'hvia intrkata, Gray, Proc. Am. Acad. xvil. 

 20S. a sleuder form, with smaller heads.— Valine arid region, t-.'Arizoua, Wright, to Cali- 

 fornia, iu the ilohave De.-^ert, Parri;, Gnene, Pringle, Par.J,, and near Vi.^alia, Congdon. 

 * A. spinoSUS, Bextii. Ba.se of stem asually ]persisteut and woody, pending up (3 to j feet 

 long) sleuder and lithe striate green branches, josulved into paniculate branchlets, terminated 

 by >maD hca.ls : cauline leaves small, linear or s])atulate-lanceolate, entire, mostly few and 

 fugaciuns, some of them with soft subnhite sjiints in or above their axils; tln.se of the 

 branchlets reduced to subulate scales or wanting : involucre hemisjiherical, i lines high, of 

 small and thinnish subulate-lanceolate bracts, imbricated in about 3 series : rays wliite, ■> 

 lines long: style-ajij.endages subulate-triangular, much sliorter than the stigraatic portion : 

 akenes glabrous. — PI. Hartw. 2U; Torr. & Gray, Fl. ii. 165; Grar, PI. LTndh. ii. 219.— 

 Banks of streams, or in moist ground, .S. \\. Texas to Arizona and^-^. Cidifornia, common ; 

 first coU. by Berlandier. (Mex.) 



"A. Palmeri, Gr.iy. Decidedly slu-uhbi/, with the habit of a small-leaved Baccharis, 3 or 4 

 feet high, very much branched tlirougliout : branchlet- slender, striate-angled, terminated by 

 the small heads : leaves apjiarently not fleshy, narrowly linear (of the branches an inch' or 

 less long), entire: involucre equalling tlie disk, barely 3 lines high, of closely imbricated 

 narrowly oblong obtuse rather dry bracts : rays 6 to 10, a line long : disk-flowers about £0 : 

 akenes sericeous-pubescent. — Proc. Am. Acad. xvii. 209. Perhaps rather of the W. Indian 

 genus Gundlachia, Gray, Proc. Am. Acad. xvi. 100. — fti. Texas, at Corpus Christi Bay, 

 Palmer. 



Sciics II. Biennials and annuals. 



§ 11. OxTTRipOLicM. Involucre of § Orthomeris ; the bracts thin and nar- 

 row', linear-lanceolate or linear-subulate, gradually Terv acute or acuminate, 

 commonlj greenish above or in the centre, but without herbaceous tips, imbri- 

 t-ated iu few series, the outer successively shorter, all erect-iqipressctl : rays at 

 lea-.t equalling the disk, numerous, often more nvimerous than the dii-k-i-l oners 

 (revulutcly coiled in drying): stj-le-appendages lanceolate-- iibulate : akenes nar- 

 row, more or less pubescent, few-nerved: pappus fine and soft: glabrous and 

 smooth annuals, chiefly of saline soil, panieulately branched, be.:ring numerous 

 small heads, with bluish or purplish rays, and with entire narrov.ly lanceolate or 

 linear leaves, on the branchlets reduced to suliulate bracts. — Grav. Proc. Am. 

 Acad. xvi. 98. Tripolium § OxytrijyrAia. DC. Prodr. v. 2.5.3. excL .-pec. Trifo- 

 liiim § Astropolium. Xutt. in Trans. Am. Phil. Sue. n. ser. vii. 2'J6. ^Lsfer § 6'..y- 

 tripoliuni. Torr. & Gray. Fl. ii. 161, in part. The two species are quite distinct 

 in the Atlantic U. S.. but seemingly confluent in Mexico and S. America. 



. exilis, Ell. Jlostly slender and diffusely branched above : principal cauline leai es linear 

 (3 or 4 inches long, 1 or 2 lines wide, lowest sometimes broader and lanceolate, rarely wiih 

 a few serratures) : heads 3 lines high: bracts of the involucre linear-subulate or more lan- 

 ceolate and acuminate: rays 15 to 40, bluisli or purple, rather conspicunus (about 2 lines 

 long), usually much surpassing the pappus: disk-flowers generally more numerous. — LIl. 

 Sk, ii. 344: Torr. & Gray, Fl. ii. 163; believed to be the species here described; but the 

 original of herb. Ell. is now lost. A. diraricatus, Torr. & Gray, 1. c, not L., .ic. A. subj- 

 latiis. Michx. Fl. ii. 112. in part. Tri[n,lnfni subulatum, Xees, Ast. 157. in part; DC. Prodr. 

 1. c. 254. e.xcl. var. horeale. TripoUum divaricatum, Xutt. Trans. Am. Phil. .Soc. 1. c. 2C j. — 

 Suli^aUne or even not at all brackish moist soil, S. Carolina to Texas, Arizona, and Cali- 

 fornia: on the southern borders occurs with very sliort ligules. (I?.iex.. W. Ind., .ic.) 



Var. australis, the commoner Jlexicau and S. American form of this polymorphc us 

 and widely diffused species, is less diffuse, less slender, often broader-leaved, and with larger 

 heads, the involucral bracts broader, less acute, and greener or purplish-tinged. — A. subu- 

 latus. Less, in Linn. vi. 120. Erigeron multiflnniM, Hook. & Am. Bot. Beech. £7. TripoUum 

 conspioiiim of authors, but not the original of Lindley. — Coast of Oregon and California (^t 

 Tisalia. in the interior, Congdon, a form with unusually large heads), &c. (3Iex. to Chili, 

 Brazil, &c.) 



