Flaveria. COMPOSITE. 353 



rather small (disk barely half-inch in diameter): rays rather sparse and narrow, half-inch 

 or less long, yellow and brownish : teeth of disk-corolla oblong : akeues with rather short 

 and scanty villosity, surpassed by the numerous setiform fimbrillte. Proc. Am. Acad. xix. 

 34. G. pulchella, var., Gray, PI. Wriglit. i. 120, along with plants mentioned as G. lanceo- 

 lata. Hills of the Rio Trio, S. \V. Texas, Wr'ujhL (Adj. Mex. to San Luis.) 



= = Akenes densely long-villous all over: fimbrillae subulate-setaceous: rays yellow: pedun- 

 cles scapifonn or from short leafy stems, 5 to 10 inches lung: some or even all the leaves pin- 

 natifid, but very variable. 



G. pinnatifida, TOUR. Perennial, cinereous-pubescent : leaves sometimes linear or with 

 linear lobes, sometimes spatulate and sinuate or even entire: pappus-paleas lanceolate. 

 Ann. Lye. N. Y. ii. 214; Torr. & Gray, 1. c. Plains, W. Texas to Colorado and Arizona; 

 first coll. by James. (Adj. Mex.) 



G. Arizonica. Annual, greener : leaves less frequently pinnatifid and with only oblong 

 lobes : pappus-paleee obovate-obloug, very obtuse or retuse. High plains of S. Utah and 

 Arizona, Palmer, Parry, Greene, Pringle. Has been confounded with the preceding. 



* * Glabrous or nearly so, thick-leaved, impressed-punctate, low, perennial from a stout multi- 

 cipital caudex: rays and disk-flowers both yellow: bracts of involucre more coriaceous, mostly 

 ovate or oblong and with short herbaceous tips: teeth of disk-corolla short, ovate, obtuse: 

 akenes moderately villous all over. 



G. Spatliulata, GRAY. Hardly afoot high, leafy-stemmed, branched from the base : leaves 

 spatulate, entire, inch long, uppermost gradually smaller : head barely half-inch in diameter : 

 rays few and small : pappus with awns surpassing disk-corolla : fimbrillo: setaceous-attenuate, 

 shorter than the akenes. Proc. Am. Acad. xii. 59. Rabbit Valley, Utah, Ward. 



G. acaulis, GRAY. Leaves all clustered on the thick caudex, ovate and obovate, somewhat 

 spatulate, contracted into slender petioles, entire or sparingly dentate : scapes a span to a 

 foot high : head larger : rays more numerous, over half-inch long, rather narrow and with 

 narrow lobes: pappus with short awns not equalling the disk-corolla: fimbrillae subulate, 

 shorter than the akenes. Proc. Am. Acad. xi. 73. S. W. Utah and adjacent Arizona, at 

 Mokiak Pass, c., Parry, Palmer. 



161. SARTWELLIA, Gray. (In honor, now in memory, of Dr. 



P. Sartwell.) Annuals (of the Texano-Mexican border), glabrous, a foot or two 

 high, leafy, fastigiately branched, and bearing very numerous small heads (only 

 2 lines high) of yellow flowers in corymbiform cymes ; the leaves all narrowly 

 linear or filiform, entire, rather fleshy, opposite, slightly connate at base. PI. 

 Wright, i. 122, t. 6, & Proc. Am. Acad. xix. 34. Two species. 



S. Flaverise, GRAY, 1. c. Leaves nearly filiform : pappus a truncate cupule. S. W. Texas, 



on the Pecos, &c., Wright, Tliurber, Havard. 



S. MEXICANA, Gray, Proc. Am. Acad. xviii. 107, xix. 34 (coll. Palmer in Northern Mexico), 

 has less filiform leaves, and a pappus of nearly distinct paleae, with which as many longer delicate 

 awns alternate. 



162. FLAVERIA, Juss. (From. flavus, yellow; plants used to dye yel- 

 low.) Glabrous herbs (mainly tropical- American), mostly annuals ; with small 

 and fascicled or glomerate heads of yellowish or yellow flowers, and opposite 

 sessile leaves, the broader ones 3-nerved. Akenes mostly smooth and glabrous. 

 Gen. 186; Benth. & Hook. Gen. ii. 409. Flaveria & Broteroa (Brotcra, 

 Spreng.), DC. Prodr. v. 635. Vermifuga, Ruiz & Pav. Prodr. 114, t. 24. 



1. Involucre 4-1 5-flowered, composed of 3 to 5 principal bracts. 



* Heads more or less clustered in broad and open naked-pedunculate compound terminal corymbi- 

 form cymes : leaves somewhat fleshy : involucre of 5 bracts : corollas except in the last species 

 nearly or quite glabrous. 



F. chloreefolia, GRAY. Glaucous, 1 to 3 feet high : leaves entire, from ovate-oblong to 

 lanceolate, broadest (half to fully an inch broad) and connate or connate-perfoliate at base: 



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