196 
13. A. dumosus L. Smooth or nearly so, 3 to 9 dm. high, the heads scattered and 
terminating minutely foliose slender branchlets: leaves linear or the upper oblong, 
crowded, entire, with rough margins: involucral bracts linear-spatulate, obtuse, in 
4 to 6 rows: rays pale purple or blue.—Border of woods, extending from the Atlantic 
States into Texas. A variable species, in the Southern States passing into var. SUBU- 
LEFouIvS Torr. & Gray, a rather rigid form, with ascending flowering branches, on 
whichthe somewhat large heads are often subracemosely paniculate and bearing erect 
or little spreading subulate-linear or linear-oblong very small leaves. 
14. A. lateriflorus Britton. More or less pubescent, much branched: leaves lanceo- 
late or oblong-lanceolate, tapering or pointed at each end, sharply serrate in the 
middle: heads racemosely unilateral upon very short minutely leafy branchlets: 
involucral bracts linear, acute or rather obtuse, imbricated in 3 or 4 rows. (4- 
diffusus Ait. A. miser of most American authors.)—Extending from the Atlantic 
States into Texas. 
15. A.race. osus Ell. Minutely scabrous-pubescent along the numerous slender 
erect or ascending branches: leaves rigid, linear, small, acute, entire: heads small, 
little over 4 mm. high, somewhat spicately or more loosely racemose and unilateral: 
rays purplish, only 2 to 4 mm. long.—A species of the Gulf States, probably col- 
lected in Texas by Lindheimer. 
+++ Bracts narrow, in several lengths, the erect green tips not dilated: branches 
loosely paniculate : stem leaves sessile, but the base not cordate or auriculate, 
16. A. salicifolius Ait. Glabrous or nearly so: stem 6 to 24 dm. high, much 
branched: leaves long-oblong to narrowly lanceolate, firm, pointed, serrate or entire, 
often scabrous: heads about 8 min. high, disposed to be thyrsoid or racemose-clus- 
tered: involucre of rather firm linear well-imbricated bracts with acute or obtusish 
green tips: rays purplish, rarely white. (4. carneus of many authors,)—A low ground 
species of the Atlantic States, extending to western Texas. Var. SUBASPER Gray, 
is a rigid scabrous form, with contracted leafy inflorescence, the broad heads usu- 
ally leafy-bracteate and the broader involueral bracts often obtuse, which extends 
from the Mississippi States into Texas. An exclusively Texan form, on rocky 
banks, is var, CA2RULESCENS Gray, which is strict and rigid, with the rather 
large heads in a more naked inflorescence, the leaves all entire, and the involucral 
bracts with narrower acute or acutish tips. 
§ 4. D@LLINGERIA. Pappus manifestly double, the inner of long capillary bristles (some 
thickened at top), the outer of very short and rigid bristles : involucral braets short, 
without herbaceous tips: heads small, corymbose or solitary: rays rather few, 
white : leaves not rigid, veiny. 
17. A. umbellatus Mill. Smooth, leafy to the top, 6 to 21 dm. high: leaves lance- 
olate, elongated, taper-pointed and tapering to the base, 7.5 to 15 em. long: heads 
very numerous in compound flat corymbs: involucral bracts rather close, obtusish, 
scarcely longer than the achenes. (Diplopappus umbellatus Torr. & Gray.)—A species 
of the Atlantic States, represented in the low pine-barrens of Texas by var. LATIFOLIUS 
Gray, which has the shorter leaves ovate-lanceolate to ovate, less narrowed or even 
rounded at base (D. amygdalinus Torr, & Gray.) 
§ 5. IANTHE. Pappus less distinctly double, the inner bristles not thickened at top, 
the outer shorter: involucral bracts well imbricated, appressed, without herb- 
aceous tips: rays violet: achenes narrow, villous: leaves numerous, rigid, small, 
linear, 1-nerved and veinless. 
18. A. linariifolius L. Stems 7.5 to 50 cm. high, puberulent, several from a woody 
root: heads solitary or terminating simple branches, 12 mm. high: leaves about 2.5 
cm. long, rough-margined, passing above into the rigid acutish involucral bracts: 
achenes flat, with strong marginal nerves and sometimes a single lateral nerve. 
(Diplopappus linariifolius Hook.)—Dry soil, common in the Atlantic States, and 
extending into Texas. Rays rarely white. 
