193 
3. C. modesta Gray. Less slender and pubescence more hirsute than in no.1: in 
volucre broadly campanulate: rays 9 to 20: disk-flowers 40 to 60, all but the central 
fertile: achenes oblong or linear, much compressed, pubescent when young, with 
merely marginal nerves: pappus of 5 oblong erose-truncate at length subcoriaceous 
scales, alternating with as many rigid awns.—Dry ground, southern Texas. 
27. DICH AITOPHORA Gray. 
A small daisy-like winter-annual, with white or rose-colored fertile 
rays, somewhat uniserial many-flowered involucre with lanceolate bracts 
of equal length, strongly convex or low conical receptacle, achenes sur- 
rounded by an almost orbicular firm wing, its edge and the body of the 
achene glochidiate-hispid, and pappus of 2 divergent awns about half 
the length of the achene, and of several minute scales shorter than and 
concealed by the bristly hairs of the achene. 
1. D. campestris Gray, At first acaulescent with a scapiform peduncle (2.5 to 
7.5 cm, high), at length with leafy branches terminated by a slender single-headed 
peduncle: leaves spatulate, entire, somewhat hirsute: head 4 to 6 mm. high: rays 16 
to 20.—Southern border of Texas, 
28. BOLTONIA. L’Her. 
Perennial and bushy-branched smooth herbs, pale green and Aster- 
like, with thickish chiefly entire leaves, white or purplish pistillate rays 
and yellow disk, many-flowered heads, bracts of the hemispherical 
involucre appressed and imbricated somewhat in two rows (with narrow 
membranaceous margins), conical or hemispherical naked receptacle, 
and very flat obovate or inversely heart-shaped achenes margined with 
a callous wing (or in the ray 3-winged) and crowned with a pappus of 
several minute bristles and usually 2 to 4 longer awns. 
1. B. diffusa L’Her. Stem diffusely branched: leaves lance-linear, those on the 
branchlets very small and awl-shaped: heads small, panicled on the slender branches: 
rays short, mostly white: pappus of several very short bristles and two short awns,— 
Low grounds, extending into Texas from the Gulf States. 
29. PSILACTIS Gray, 
Minutely pubescent or glandular or glabrate annuals, with slender 
and loosely paniculate-branching stems, pinnatifid or incised lower 
leaves tapering into a petiole, narrow often entire upper ones, small 
heads terminating the branches and with violet or purplish or white 
usually infertile rays, bracts of the hemispherical involucre imbricated 
in 2 or 3 series with herbaceous tips or the outer herbaceous, pubescent 
narrow achenes, those of the ray sometimes with an obscure ring in 
place of pappus, those of the disk bearing a single series of soft capil- 
lary bristles. 
1, P. asteroides Gray. Scabro-puberulent, 3 to 9dm. high: lower leaves spatu- 
late or oblong, sometimes laciniate-pinnatifid, sometimes barely dentate; upper 
mostly linear and entire: involucral bracts lanceolate or linear.—Southwest Texas. 
