187 
parted into rather numerous lobes, the lobes and teeth being mucronate-bristly: 
heads, involucre, and achenes of the preceding.—Common on plains throughout 
Texas. It varies to nearly glabrous throughout, and also with the leaf-divisions 
soinetimes nearly filiform. 
+ + Leaves entire (sometimes few-toothed in one species) and narrow: heads 6 to 8 mm. 
high. 
++ Annual herbs: rays & to 16. 
7. A. divaricatus Gray. Scabrous-pubescent or glandular (sometimes glabrate), 
3 to 6 dm. high, slender and effusely paniculate: leaves rigid, linear-lanceolate or 
lower spatulate-lanceolate, mucronate-acute or cuspidate, entire or beset with a few 
spinulose teeth, more or less setose-ciliate toward the base: the upper small and sub- 
ulate, and in the diffuse naked panicle minute: involucral bracts subulate-attenu- 
ate.—Dry and sandy soil, extending from the Gulf States into Texas as far as Gil- 
lespie County. 
8. A. Hookerianus Gray. Low, loosely branched from the base, barely hirsute, 
not glandular: leaves not rigid, entire; upper linear or attenuate-lanceolate, spar- 
ingly hispidly ciliate; lower spatulate, short and naked: involucral bracts subulate- 
lanceolate, with less attenuate points.—Gonzales (Drummond). Said not to have 
been found since. 
++++ Perennials, woody at base or shrubby: rays 3 to 6. 
9. A. laricifolius Gray. A shrub about 3 dm. high: leaves linear-acerose, rigid, 
mucronate, conspicuously resinous-punctate and becoming viscid, crowded but sel- 
dom axillary-fascicled, 12 mm. or less long: heads in close cymose clusters termi- 
nating fastigiate branchlets: involucral bracts subulate-linear, acute, appressed in 
2 or 3 series: rays 3 to 6, with rather conspicuous ligules: achenes villous.— Western 
border of Texas. 
A. Texanus Coulter is Haxloesthes Greggii Gray. 
21. BIGELOVIA DC. (RAYLEsS GOLDEN-ROD.) 
Perennial herbaceous or suffrutescent plants, with mostly narrow en- 
tire leaves (in some species toothed or pinnatifid), discoid heads of 
yellow flowers, involucre of rigid somewhat glutinous closely imbricated 
and appressed bracts, narrow receptacle, slender or somewhat obconical 
achenes, and pappus a single row of capillary bristles. 
* Heads 3 to 5-flowered. 
1. B. pulchella Gray. Shrubby, glabrous and green, 6 to9 dm. high, very branch- 
ing and leafy up to the factigiate-cymose heads: leaves narrowly linear: heads 16 
to 18 mm. high, 5-flowered, with rigid keeled involucral bracts which are acute 
and cuspidate-mucronate and so imbricated as to form five conspicuous vertical 
ranks with 5 or 6 in each rank. (Linosyris pulchella Gray )—West of the Pecos, 
2. B. nudata DC. Perennial herb, glabrous, 3 to 6 dm. high, strict and simple 
up to the compound-fastigiate and corymbose cyme of numerous sinall heads: leaves 
spatulate to nearly filiform, the uppermost small and braet-like: heads barely 6 mm, 
high, 3 or 4-flowered, with obtuse chartaceous bracts so imbricated as to form indis- 
tinct vertical ranks with about 3 in each rank: receptacle with an awl-shaped pro- 
longation in the center.—A Gulf species of the pine-barrens, represented in Texas by 
var. VIRGATA Torr, & Gray, in which the cauline leaves are linear-filiform, or the 
lowest and radical linear-spatulate. 
* * Heads 7 to 380-flowered, 8 to 12 mm. high. 
3. B. Wrightii Gray. Herbaceous to the woody base, the stems rather strict and 
slender, 3 to 6 dm. high: leaves narrowly linear, entire (sometimes lower ones spar- 
ingly laciniate-dentate): heads 7 to 15-tlowered, usually numerous and crowded in 
a corymbiform cyme; involucral bracts greenish at or near the apex, but with no defi- 
