90 SYSTEMATIC DESCRIPTION OF ASTERS 
SUBDIVISION A. STEM assurgent, repeatedly flexuous, brittle. 
. Chief leaves prolonged ovate-lanceolate, incurved-acuminate. 
I. A DIVARICATUS : coarse teeth; moderately broad and deep sinus; pedicels and 
petioles slender, divergent or divaricate ; rays 6—9 ; outermost bracts pepe 
middle ones chanfer-obtuse (7. ¢., bevel-tipped), inner ones rounded, all very 
ciliate. 
I'-?, A, DIVARICATUS variants (of doubtful stability, and not recognized here by Latin 
names, 7. ¢., as species or Subspecies) include the following forms likely to be 
sought in this key. For other less-marked forms, in this and other species, see 
descriptions. 
Tuberous form: stem bases conspicuously thickened. 
Mitchellian form: conspicuous small rameadls, oval-obtuse and subentire; like 
leaves of Afitchella repens. 
Tobyhanna form : ‘strict stems and branches. 
Flabellate ier: deeply branched 
Green-disk form : disk pale- yellow turning greenish. 
Circaean form: dwarf communities, few-flowered, Circaea-like. 
Leaves highly diverse, much shorter (except the last two forms). 
Mixed-leaf form : some upper cauline /eaves half-size and paraboloid. 
Obolarian form : some upper cauline /eaves quarter-size and sudcircular. 
Russet-tuft forms : shorter ovate [eaves, dull-green, turning russet. 
Cupreous form : dull ovate leaves ; much ciliation ; rays turn copper-red. 
Prune-stem form : taper-lanteo olate leaves ; stem prune-color 
pondus form: dark MT NE leaves; disk very pale; flower-heads 
-like. 
tb. i DIVARICATUS ALATUS : Jarge strongly-cut leaves; add petioles ; broad slight 
nus; bracts paler; only the outer ones obtuse 
Ic. A. DIVAR. CYMULOSUS : pma PRINT Soia leaves ; crowded heads; 
short rays ; small, sh 
Id. A. DIVAR. CURTIFOLIUS : pono rounded leaves, obtuse or acute; close sharp 
little te 
Ie. A. DIVAR. DELTOIDEUS: small triangular-ovate leaves, acute; small remotish 
teet 
If. A. DIVAR. FONTINALIS : tufts of /a7ge thin radicals, oval.acute, chiefly ; bracts 
blunt-tapered. 
pen 
2. A. VIRIDIS: inflorescence aS of A. divar.; but heavy thick radicals as of A. 
peras n large oval-rhomboid tinal: 
1 . ARE LA: leaves oblong ovate, acuminate, pale, small, low-serrulate; sinus 
oin narrow ; disk reddish-brown ; bracts pale, narrow-oblong ; rays about II. 
c. Leaves. prolonged, and attenuate, but unlike 4. divaricatus. 
* Braets obtuse or Chanfer, linear; teeth very sharp, outflung; sinus 
road; rays dingy-white. Virgate. 
4. <A. PERSALIENS ; /eaves si lanceolate, taper-based ; many remote couchant teeth ; 
some heads with acute bracts, 
49. Rounded-base form: most ya broad-based ; teeth less pronounced. 
4°. Jagged-leaf form : most leaves trunca'e-based; tee nger, Crowded. 
5. A. ATROVIRENS: dark; aves sriangular-acuminate; long close slender A: ; 
many leaves wh deep broad sinus; heads small, iat. lea fy-subtended. 
