CICHORIACEAE 1491 
chene 5-15-nerved and sometimes angled by 4 or 5 of the 
stronger nerves: involucre copiously poe II. RACEMOSI. 
Heads 20-35-flowered, in corymb-like panicles III. CREPIDINEI. 
I. ALB 
eads 5-7-flowered : involucre slender, less "m 3 mm. thick ; 
pura light-green: pappus stramineous. 1. N. altissimus. 
Heads Kad flowered : involucre stout, over 3 mm. thick, deep- 
n, gla aucous, or purple 
Pappus deep cinnamon-color ed. 2. N. albus. 
Pappus stramineous or light. bro 
Leaf-blades merely toothed o enews ine 
lower leaf-blades elliptic to oval, not cordate. 3. N. integrifolius. 
Larger bracts of the outer involucre ovate: lower 
leaf-blades pee oe cordate. 4. N. roanensis, 
Leaf-blades, at least some of them, pinnatifid, lobed, or 
divided. 
Inflorescence paniculate 
Pa nicle broadened upw vard: bracts of the in- 
volu S 
late: p oS exceeding the inner involu- 
eral bra 5. N. serpentarius. 
Larger bracts of the outer involucre ee m 
triangular-ovate: pappus and inn 
volucral bracts about equal. 6. N. trifoliatus. 
Panicle cylindric: bracts of the involucre spar- 
ingly hairy.. T. N. cylindricus. 
Inflorescence racemiform. 8. N. virgatus 
II. Rac 
Leaf-blades entire or rather finely pee Soa of the 
inflorescence very short Bud close together. 9. N. asper. 
III. CREP 
Leaf-blades finely or coarsely NS or pe pu aches of the 
inflorescence elongate and distan 10. N. crepidineus. 
N. a s (L) H Stem 9-21 dm. tall, glabrous, glaucous: leaf- 
adc denticulate, or lobed o a divided and with denticulate or lobed divisions: 
involucres les than ick, the outer 
bracts of the o deitoid to e 1-2 
mm. long, the inner ones 9-10 lon 
light-green, glabrous: ligules mon eni ish or 
yellowish.—Woods and low thickets, various 
Doe el pd Plain, Ga. to Miss. T 
Tenn., Man., and New 
2. N. albus (L.) Hook. Stem 3-16 
m. 
tall, glabrous, glaucous: leaf-blades, or the 
divisions, coarse ely toothed: outer bracts of 
e involuere ovate, ud. long, the in- 
ones 10-12 perd dark-green, 
a. ligules "dul white or cream- 
eolored.—Rich banks, woods, and thickets, 
hal tee P Pd Coastal Plain, Ga. 
o Tenn., Sask., 
tegrifolius Cas Ste -18 dm. tal, glabrous, at least in age; 
wis blades hese oe to pum arr t above or below the middle, finely or 
coarsely UT those of the lower jade cuneate to subcordate at the bas 
outer bracts of the involucre d hirsute on the back: pappus dirty 
brown Woods, various provinces N of Coastal Plain, Ga. to N. Y. 
4. N. roanensis Chickering. Stem 3-5 dm. tall, pubescent: leaf-blades 
ovate 6 poene denticulate, the basal lobes directed: backwards or sidewards: 
