354 COMPOSITE. Flaveria. 



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

 pus of 4 thin pale»!) — PI. Fendl. 88, & PI. Wriglit. 114. — Low grounds, on and near 

 the Rio Grande, S. W. Texas, Wright, Parry, Bi<jdow. (Adj. Mex., Wislizenus, Gregg, 

 Palmer. ) 



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

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

 rare spinulose deuticulations : heads in very ample cymes, lO-l.'j-flowered, often 3 lines 

 long : no ray : bracts of the involucre broad. — Gymnosperma 1 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- 

 llowered, commonly uuiligulate. — Nov. Gen. & Spec. 33; Torr. & Gray, Fl. 360. F.via- 

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

 Selloa nudata, Nutt. in Am. Jour. Sci. v. 300 ; therefore Gymnosperma nadatum, UC. Prodr. 

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



* * Heads in closer siibsessile or short-pedunculate or foliose-involucrate chiefly terminal glomer- 

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

 uniligulate: disk-corollas sparsely hirsute at base. 



P. angustifolia, 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, Pl. Fendl. 88. Milleria angusti- 

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

 Mexico. (Mex.) 

 F. CoNTRAYERK.v, 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. Involitcre 1-2-fllowered, of 1 to 3 unequal bracts : heads densely glomer- 

 ate. — Broteroa, DC, corrected from Brotera, Sprang, in Sclirad. 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-nerved, acutely serrate : glomerules of many con- 

 fluent heads, sessile in the forks and involucrate 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. Nauenbe.rgia trinervata, Willd. Spec. iii. 2393. Broteroa trinervata, 

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



163. POROPH'^LLUM, Vaill. {U.6po<;, a jiassage or pore, 4>vXXov, leaf, 

 the foliage or invohxcre 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. Kleinia, Jacq. Stirp. Am. 

 215, t. 127, not L. 



* Anuual, with bnad crenate-rcpand leaves on slender petioles: bracts of cylindrical involucre 

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

 lllifdrni or slender-fusit'urm. 



P. macrocephaluni, 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: akenes much longer than the 

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

 Wright, Thurber, &c. (Mex.) 



