CARDUACEAE 1375 
A. trigonicus Burgess. Plant profusely branched, with rigid glabrate 
brownish stems and long flagellate ascending branches, which are closely short- 
ae or are spiciform and beset with small remotish subsessile heads: stem 
8 dm. high or less: leaf-blades nd and heavy, somewhat canescent or hispid 
above, velvety-hispidulous below; leaf- ys elongate triangular; the truneate 
base pu buen at the corners, and sometimes a little pA leaf- 
blades . or more, aeute or obtusish, the sides straight, serrate or cren ate; 
petiole re domne a narrow cun wing: rameals sum, pel numerous, 
overlapping and appressed, linear- elliptic, heads small, hardly 2 em. broad: 
bracts linear-acute, the green tip roue .—Plains and prairies, various 
provinces, Ala. to Tex. and Kans.—Fall. 
21. A. azureus Lindl. Stem 3-12 dm. high, slender, stiff, rough, with numer- 
ous ascending or patent branches: leaf- blades thick, of a peculiar crusty tex- 
h r wer e 
y 
9—15 em. long, with slender ofte n pubescent petioles 3 ioe of the upper cauline 
leaves with short Dod n bases or sessile, dS or linear, entire; those 
f bran 20-25 mm. 
ed 
broad: involuere aun braets glabrous, popa: e abruptly iid 
imbrieate, their broad sharp E ‘tips appressed: ray-flowers 10-20; ligul 
i e, 6-8 mm. long: 
various provinces, rarely Coastal Plain, a to ex., Kans., Minn., 
Sum.-fall..—Resembles A. undulatus L.; but leaves hispidulous on both Hoc 
flowers smaller; rays darker ome bluer ; ' pubescence scanty.—A. azureus scabrior, 
ranging from La. to Mo., Minn., and Ont., has an extremely rough stem with 
mor t branches and 'prineipal leaves with elliptic-lanceolate, entire, long- 
erec 
petioled, noncordate blades 
22. A. Ae Burgess. Stem pee and repeatedly much-branched, 8 dm 
high or less: leaves very rough and stiff, of grass-like form; chief leaf- blades 
linear- rdc or faleate, often 13 cm. long, 0.5 em. in uniform breadth, 
usually also with a narrow-margined petiole S s em., eae = be em and . 
8x1 or 
less: inflorescence irregular, on very long and eu aggling branches, which are 
often for 1.5 to 3 dm. clothed with minute subulate sub-appressed bractlets: 
heads a ed os l em. broad: bracts of the involucre nu with long 
sharp tips.—Plains and prairies, various provinces, Ala. to Tex., "Okla., and 
peek all JL Represents the extreme of attenuation among the kindred 
of A. azureus 
23. A. doce L. Stem stiff, 3-10 dm. high, pe rough-pubescent, divari- 
eately branehed above: leaf -blades usually thiek, rough on both iis es when 
dry, pubescent beneath, dentate, undulate or entire, aeute or aeuminate, those 
f the radieal leaves small, orbieular to ovate, soft- -downy; the ped ae 
leaves ovate, with cordate base, 5-12 e ng, ae naked petioles expanding 
to a ping base, at least in some leaves; middle el ilar, 
lanceolate or elliptic; upper cauline leaves sessile or clasping, chiefly e- 
elliptic; branch-leaves subulate, small and re ae reduced: h ee ipid. 
di nehes, 16- . broad: 
involuere broadly turbinate: braets of the inv ster eens "elliptic, ‘slightly 
ubescent, acute or acutish, their es ds tips appressed: ray-flowers 8-15; 
ligules ene o [S 10 m ong: pappus dM ee ry soil, various 
A Fla. to rk., , and ——A. Baldwinii T. & G., based 
n the upper part of "i specimen of one of the undulatus iint cana! definitely 
ie placed under any species on account of the peace of lower leaves, so that 
the name is best dropped from this ana 
