199 
late with cuneate base tapering into a petiole, obtusely and deeply 5 to 9-toothed 
or almost lobed: peduncles scapiform, 10 to 20cm. long: involucre 8mm. high: rays 
6mm. long, white: pappus simple. (Z. scaposus Torr. & Gray, not DC.)—Sandy 
seacoast of southern Texas. 
7. H. flagellaris Gray. More or less cinereous with fine appressed pubescence: 
stems slender, diffusely decumbe:.t and flagelliform but leafy, some prostrate, many 
at length rooting at the apex and proliferous: leaves small, entire; radical spatu- 
late and petioled; those of the branches passing to linear: peduncles 4 to 12.5 em: 
long: head barely 6 mm. high: rays white or purplish: pappus double, the outer 
subulate-setulose.—Banks of streams west of the Pecos. 
**** Annuals (sometimes biennials), leafy-stemmed and branching: heads conspicuously 
radiate: pappus more or less double: leaves entire, sometimes dentate or lower 
ineisely lobed. 
+ Rays only 30 or 40, white, not very narrow, barely 6 mm. long, and with pappus as in 
the disk-flowers : leaves narrow, entire. 
8. E. modestus Gray. Much branched from the base, 3 dm. high or less, slender, 
rigid, cinereous-hirsute or hispid: branches terminated by the small (4 mm, high) 
slender-pedunculate heads: upper leaves linear and lower narrowly spatulate, 
about 2.5 cm. long.—Dry and sterile rocky plains, western Texas. 
+ + lays very numerous (about 100), narrow, with pappus like the disk-flowers : leaves 
from entire to sparingly lobed. 
9. E. divergens Torr. & Gray. Diffusely branched and spreading, cinereous- 
pubescent or hirsute: leaves linear-spatulate or the upper linear and the lowest 
broader (these 4 to 8 mm. wide and sometimes laciniately toothed or lobed): heads 
4 to 6 mm. high, the white or purplish or sometimes violet rays equally long: involu- 
cre hirsute.—Low plains and river-banks, central and western Texas. 
10. B. tenuis Torr. & Gray. Branched from the root, ascending or erect, some- 
what hirsute or pubescent: leaves oblong-spatulate or lanceolate, and the lowest 
obovate (8 to 12 mm. wide), occasionally few-toothed or sinuate-lobed: heads little 
over 4mm. high: involucre nearly glabrous: rays white and purplish.—Extending 
in low ground from Arkansas and Louisiana to the Lower Rio Grande. 
+ + + Rays not excessively numerous or very narrow (4 to 6 mm. long), white or barely 
purplish-tinged : outer pappus a crown of minute scales, the inner of deciduous 
Sragile bristles, usually wanting in the ray. 
11. B. strigosus Muhl. (Daisy rLEABANE.) Stem panicled-corymbose at the 
summit, roughish like the leaves with minute appressed hairs, or almost smooth: 
leaves entire or nearly so, the upper lanceolate, scattered, the lowest oblong or spat- 
nlate, tapering into a slender petiole: rays white, twice the length of the minutely 
hairy involucre.—Dry open grounds throughout Texas. Var. Beyricum Gray is a 
slender form, with minute and sometimes almost cinereous pubescence, smaller heads, 
and rays from white to pale rose-color. 
A form from near Pena (Duval County) seems to be intermediate between this spe- 
cies and EF. annuus. It is low and slender, with a cluster of spatulate more or less 
dentate or lobed leaves tapering into a long petiole, and long filiform branches bear- 
ing small and narrowly linear entire leaves and long-pedunculate solitary heads. 
The involucre is about as bristly as in Z. annuus, and much of the pubescence is not 
appressed. 
32. CONYZA Less. 
Herbaceous, with small many-flowered heads, narrow involucral 
bracts in 1 to 3 series, corolla of the female flowers (much more numer- 
ous than the perfect ones) reduced to a filiform or short and narrow 
