234 
++ ++ Teeth of disk-corolla short and broad, obtuse, pointless or obscurely 80. 
= Achenes destitute of villous hairs at the upper part: leaves undivided. 
5. G. amblyodon Gay. Mostly hirsute, leafy to the top: leaves oblong or the 
lower spatulate, sessile by an auriculate base, denticulate or upper entire: rays 
numerous and contiguous, throughout brownish-red, 2.5 cm, or less long.—Sandy 
prairies of eastern and southern Texas. 
6. G. Mexicana Gray. Minutely pubescent, naked above, with long ratherrigid 
peduncles: leaves lanceolate, rather small, entire, or the lowest sparingly toothed: 
rays rather sparse and narrow, 1.5 cm. or less long, yellow and brownish. (G. pulch- 
ella, var. Gray, Pl. Wright. )—Hills of southwestern Texas and adjacent Mexico. 
— — Achenes densely long-villous all over: some or all the leaves pinnatifid. 
7. G. pinnatifida Torr. Cinereous-pubescent: peduncles scapiform or from short 
leafy stems, 10 to 25 cm. long: leaves sometimes linear or with linear lobes, some- 
times spatulate and sinuate or even entire: pappus scales lanceolate.—Plains of 
southern and western Texas. Nealley’s specimens from the Chenate Mountains have 
almost all the leaves narrowly linear and entire. 
93. SARTWELLIA Gray. 
Glabrous leafy fastigiately branched annuals, with narrowly linear 
or filiform entire opposite leaves, very numerous small heads of yellow 
flowers in corymbiform cymes, 5 oval or oblong somewhat fleshy invo- 
lucral bracts subtending as many ray-achenes, convex naked recepta- 
cle, terete oblong or linear 8 to 10-striate achenes, and pappus a deep 
chaffy cup with fimbriolate edge (in ours). 
1. S. Plaveriz Gray. Leaves nearly filiform.—Southwestern Texas, on the Pecos 
and westward, 
94. FLAVERIA Juss. 
Glabrous mostly annual herbs, with opposite sessile leaves, small and 
fascicled or glomerate 1 to several-flowered heads of yellowish or yellow 
flowers which are all fertile and tubular or one female and ligulate, 2 to 
5 mostly carinate-concave involucral bracts, terete and striate achenes, 
and no pappus (excepting in one species). 
* Involucre 4 to 15-flowered, composed of 3 to 5 principal braets. 
+ Involucre of 5 bracts : heads clustered in broad and open naked-pedunculate compound 
terminal cymes : no ray. 
1. F. chlorzfolia Gray. Glaucous, 3 to 9 dm. high: leaves entire, ovate-oblong to 
lanceolate, broadest (from 1 to 5 em. broad) and connate or connate-perfoliate at 
base, sometimes as much as 7.5 cm. long: heads about 12-flowered: pappus occa- 
sionally present, and consisting of 2 to 4 thin scales which are all on one side, leav- 
ing the other side naked.—Low grounds, southwestern Texas, Nealley’s abundant 
and fine specimens from ‘‘ Screw Bean” all show pappus. 
2. F. longifolia Gray. Rather stout: leaves from linear to lanceolate, broadest or 
not narrowed at the closely sessile base, 5 to 12.5 cm. long, entire or with few spin- 
ulate denticulations: heads 10 to 15-flowered.—Along the Mexican side of the Rio 
Grande, and likely to be found on the Texan border. 
++ Involucre of (mostly) 3 bracts: heads in closer subsessile or leafy chiefly terminal 
glomerules, commonly with one ligule. 
3. F. angustifolia Pers. Erect: leaves linear to lanceolate, serrulate or entire, 
sessile by broadish or little contracted base.—Alkaline ground, southwestern Texas. 
