1214 CARDUACEAE 
19. Aster sagittifòlius Willd. Stem rather slender, 6-15 dm. high, strict, glabrous, 
or sparingly pubescent above, the inflorescence tall and paniculate with ascending branches: 
leaf-blades thin, glabrous above or but slightly roughened, usually glabrate beneath, those 
of the basal and lower cauline leaves ovate-lanceolate to lanceolate, with cordate or rarely 
sagittate base, sharply serrate, acuminate, 7-15 cm. long, with slender naked or narrowly 
margined petioles ; blades of the upper cauline leaves lanceolate, sessile, or on short and 
usually margined petioles, serrate or entire, those of the branches very much smaller, linear- 
subulate : heads 16-20 mm. broad, numerous, crowded, racemose: involucre turbinate ; 
bracts linear-subulate, glabrous or nearly so, their tips green and slightly spreading: ray- 
flowers 10-15; ligules light blue or purplish, 6-8 mm. long: pappus whitish. Resembles 
A. cordifolius L.; but its bracts narrower, subulate-acuminate, and its inflorescence almost 
without leafiness, the axile leaves being reduced, narrowed and stringy rather than folia- 
ceous. 
In dry soil, New Brunswick to North Dakota, North Carolina, Tennessee and Kansas, Late sum 
mer and fall.— Aster sagittifolius dissitiflorus Burgess, differs from the typical form of the species in its 
broader looser pyramidal inflorescence, the somewhat larger and longer-peduncled heads, the leaf- 
blades less serrate, often none cordate. New York to Florida, Mississippi and Oklahoma. 
20. Aster plumàrius Burgess. Plants about 3 dm. high, chiefly composed of the 
dense plume-like violet inflorescence: stem smooth, zigzag: leaf-blades very smooth and 
firm, thickish, chiefly lanceolate-acuminate and slit-serrate, inclined to be strongly falcate 
at apex and unequal at the slightly cordate broadish base, measuring 7 x 1.5 cm. or less; 
veins strongly incurved ; petioles narrow-margined ; lower axile leaves conspicuous, but 
rapidly diminished, soon becoming narrowly falcate-lanceolate and entire, sessile by a taper 
subcuneate base: inflorescence otherwise naked, ovate-lanceolate in outline : bracts narrow, 
acute, their distinct enlarged green tips chiefly spatulate. Resembles a dwarf A. sagitti- 
folius, but differs in leaves, bract-tips, absence of bracteoles, etc. 
On mountain tops, North Carolina, chiefly on balds at 1500-1550 m. Fall. PLUME ASTER. 
21. Aster hirtéllus Lindl. Plant cinereous-green, finely tomentulose, profusely 
branched and racemose-panicled : stem 6 dm. high or more; leaf-blades very rough and 
dull dark green above, soft-hairy and pale beneath, thinnish ; leaf-blades cordate-ovate 1n 
type, crenate-serrate in the middle, 4 x 3 cm. or less; leaf-form varying to cordate-orbicular 
and obtuse below, and oblong-acute above ; axiles rounded, oval or lance-elliptic, minute, 
sessile; rameals oval, remotish, thin, spreading or deflexed ; similar oval leaves clothe 
sprouts in the axils: inflorescence forming half of the plant or more, repeatedly ramuli- 
ferous, with long pedicels (often 3 cm.) which grow closer and shorter at the summit : 
heads 2.5 em. broad: rays about 16, pale purplish, soon becoming whitish : disks soon deep 
purple: bracts linear-subulate, rather loose, cont/nued in similar bractlets down the pedi- 
cels ; the faint green tips hardly at all enlarged. 
On plains or prairies, Missouri and Kansas to Texas. Fall. 
22. Aster Drummóndii Lindl. Stem 6-15 dm. high, usually stout, finely and 
densely canescent : leaf-blades mostly thin, ovate or ovate-lanceolate, sharply toothed, 5-10 
cm. long, acuminate, rough above, canescent beneath, those of the basal and lower cauline 
leaves with cordate sinus, and slender naked petioles, those of the upper cauline cordate 
or rounded at the base, usually on margined petioles, those of the branches chiefly sessile, 
entire and lanceolate, much smaller: heads 12-25 mm. broad, numerous or crowded on the 
racemose branches: involucre turbinate ; bracts linear, slightly pubescent, acute or era 
what acuminate, their green tips appressed : ray-flowers 8-15 ; ligules purplish blue, 6- d 
mm. long: pappus whitish. Resembles A. cordifolius L.; but rougher, more hairy, an 
decidedly gray. 
In dry soil; borders of woods and prairies, Ohio to Minnesota, Kansas, Arkansas and Texas. : Fall. 
23. Aster Texànus Burgess. Plants but slightly pubescent, with long lax foliolose 
*branches: stem glabrate: leaves roughened and dull above, pale and somewhat cinereous 
beneath, prevailingly similar in size, shape and slender petiole ; leaf-form of gp 
type with deep narrow sinus, regularly crenate-serrate to the obtusely-acute apex, 5x4 oem. 
or less; radicals oval ; upper-cauline leaf-blades smaller, truncate at base into a sgt 
strap-like wing ; the uppermost sessile, very small and numerous, ovate or narrowly e T 
tical, so continuing throughout the inflorescence : heads small, 0.5 cm. high, ERPE y 
long-pedicelled on the slender stem or its branches : bracts somewhat lax, smoothis 4 P 
ear-acute, the green tips narrowly elliptic: achenes often pubescent. Confused wit Ts : 
Drummondii ; but its heads seattered, not massed, its leaf-form different, broader, sma i 
and non-acuminate, its marginal teeth stronger, sinus deep and narrow, its leaves less roug 
and thick. 
In thickets, Louisiana and Texas. Fall. ee b 2 
.. 24. Aster trigónicus Burgess. Plants profusely branched, with rigid eee dpt 
ish stems and long flagellate ascending branches, which are closely short-branched o 
