354 COMPOSITE. Flaveria. 



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

 pus of 4 thin paleaj!) PI. Fendl. 88, & PI. Wright. 114. Low grounds, on and near 

 the Rio Grande, S. W. Texas, Wright, Parry, Biydow. (Adj. Mex., Wislizenus, Gregg, 

 Palmer.} 



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

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

 rare spinulose denticnlations : heads in very ample cymes, 10-15-rlowered, often 3 lines 

 long: no ray: bracts of the involucre broad. Gymnospermal oppositifolium, 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, Fl. 3GO. F.ma- 

 ritima, HBK. Nov. Gen. & Spec. iv. 285. F. teii/ii/'olin, Nutt. Jour. Acad. Philad. vii. 81. 

 Selloa nudata, Nutt. in Am. Jour. Sci. v. 300 ; therefore Gymnosperma 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 fol lose-in volucrate chiefly terminal glomer- 

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

 uniligulate: disk-corollas sparsely hirsute at base. 



F. angustif 61ia, PERS. Erect, a foot or two high : leaves from linear to lanceolate, serru- 

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

 exceeding the disk. Syn. ii. 489 ; DC. Prodr. v. 635 ; Gray, PI. Fendl. 88. Miller ia angusti- 

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

 Mexico. (Mex.) 

 F. CONTRAYERBA, Pers., 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 1 -2-flowered, of 1 to 3 unequal bracts : heads densely glomer- 

 ate. Broteroa, DC., corrected from JBrotera, Spreng. in Schrad. Jour. Bot. (1800), 

 ii. 186, t. 5. 



F. repanda, LAG. 1. c. Divergently branched annual: leaves obovate to oblong-lanceolate 

 with narrowed petiole-like base, strongly 3-uerved, acutely serrate : glomerules of many con- 

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

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

 Pers. Brotera Contrayerba, Spreng. 1. c. B. trinervata, Pers. Syn. ii. 498. B. Sprengelii, 

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

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



163. POBOPH^LLUM, Vaill. (Ildpos, a passage or pore, <u'AAov, leaf, 

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

 oil-glands.) 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. Itfeinia, Jacq. Stirp. Am. 

 215, t. 127, not L. 



* Annual, with bread crenate-repand leaves on slender petioles : bracts of cylindrical involucre 

 5: corollas purplish, with tiliform 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 above, clavate 



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



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



Wright, T/turber, &c. (Mex.) " 



