354 COMPOSIT.E. Flaveria. 



heads about 12-flowered, 3 lines long: no ray. (A few flowers once seen with a pap- 

 pus of 4 tliin palea;!) — PI. Fendl. 88, & PI. Wright. 114. — Low grounds, on and near 

 the Rio Grande, S. W. Texas, Wrujld, Parrij, Blijetow. (Adj. Mex., Wtslizenus, Gre<j(], 

 Palmer.) 



F. longifolia, Gray, 1. c. Rather stout, 1 to 3 feet high, pale : leaves from lineiir to lance- 

 olate, broadest or not narrowed at the closely sessile base, 2 to 5 inches long, entire or with 

 rare spinulose denticulations : heads in very ample cymes, 10-1.5-flowered, often 3 lines 

 long: no ray: bracts of the involucre broad. — Gijmnospermal opjiositifutium, DC. Prodr. 

 V. 312. — Not yet found on the Texan side of the Rio Grande. (Adj. Mex.) 



F. linearis, Lag. Rather slender, a foot or two high : leaves from narrowly linear to 

 lanceolate, or sometimes lower oblong-lanceolate (and inch broad), all contracted above the 

 somewhat connate bases, sometimes denticulate : heads smaller and more glomerate, 5-8- 

 flowered, commonly uniligulate. — Nov. Gen. & Spec. 33 ; Torr. & Gray, PI. 360. F. ma- 

 ritlnia, HBK. Nov. Gen. & Spec. iv. 28.5. F. lenuifoUa, Nutt. Jour. Acad. Philad. vii. 81. 

 Selloa nudata, Nutt. in Am. Jour. Sci. v. 300 ; therefore Gijmnosperma nudatum, DC. Prodr. 

 V. 312. — Coast and Keys of S. Florida; first coll. by Ware. (Cuba & Bahamas.) 



* * Heads in closer subsessile or short-pedunculate or foliose-involucrate chiefly terminal f^lomer- 

 ules: involucre of mostly 3 bracts, narrow, 3-5-flowered or some onh- 2-flowered, commonly 

 uniligulate: disk-corollas sparsely hirsute at base. 



F. angustif olia, Pers. Erect, a foot or two high : leaves from linear to lanceolate, serru- 

 late or entire, lightly 3-nerved, .sessile by broadish or little conti-acted base : ligule somewhat 

 exceeding the disk. — Syn. ii. 489 ; DC. Prodr. v. 035 ; Gray, PI. Fendl. 88. Milleria angnstl- 

 folia, Cav. Ic. iii. 12, t. 223. — Alkaline ground, S. W. Texas to E. Colorado and New 

 Mexico. (Mex.) 

 F. CoNTRAYERBA, Pcrs., is S. American, spreading to W. Indies, and possibly to within our 



borders, has mostly oblong-lanceolate leaves contracted at base and conspicuously 3-uerved, 



more glomerate heads, and ligule not exceeding the disk or wanting. 



§ 2. Involucre l-2-flowere(i, of 1 to 3 unequal bracts : .heads densely glomer- 

 ate. — Broter-oa, DC, corrected horn. Brotera, Spreng. in Schrad. Jour. Bot. (1800), 

 ii. 186, t. 5. 



F. repanda, Lag. 1. c. Divergent!}' branched annual : leaves obovate to olilong-lanceolate 

 with narrowed petiole-like base, strongly 3-nerved, acutely serrate : glomcrules of many con- 

 fluent heads, sessile in the forks and involncrate at end of the branches, outermost heads 

 'commonly of a single short-ligulate flower. — F. Cordrayerba, Gray, PI. Wright, i. 114, not 

 , Pers. Brotera Contrcnjerba, Spreng. 1. c. B. trinervata, Pers. Syn. ii. 498. B. Sprcmjelii, 

 Cass. Diet, xxxiv. 304. Nanenherfpa trinervata, Willd. Spec. iii. 2393. Broteroa trinervata, 

 DC. Prodr. v. 636. — S. W. borders of Texas, Wright. (Mex., &c.) 



163. POROPH"^LLUM, Vaill. (Hopos, a passage or pore, (^u'AAov, leaf, 

 the foliage or involucre appearing as if punctate on account of the translucent 

 oil-gland.s.) — Herbaceous or suffrutescent plants (of the warmer parts of America), 

 usually glaucous ; with alternate or opposite undivided leaves, and pedunculate 

 heads of yellow or purplish flowers. Oil-glands present in the involucre when 

 wanting in the leaves, in the form of dots or stripes. — L. Hort. Cliff. 494 ; 

 Adans. Fam. ii. 122; DC. Prodr. v. G47, excl. § 2, 3. Kleinia, Jacq. Stirp. Am. 

 215, t. 127, not L. 



* Annual, with broad crenate-repand loaves on slender petioles : bracts of cylindrical involucre 

 5: corollas purplish, with filiform tube several times longer than the throat and limb: akenes 

 filiform or slender-fusiform. 



P. macrocephalum, DC. A foot or two high : leaves roundish-oval to oblong (or some 



of the lowest narrower), about the length of the petiole: peduncles enlarged al)ove, clavate 



and fistulous : head inch long : bracts of involucre obtuse : akenes much longer than the 



, pappus. — Prodr. v. 468 ; Gray, PI. Wright, ii. 93. — Rocky hills and ravines, Arizona, 



Wright, Thurber, &c. (Mex.) ' 



