( 211 ) 
spicuously serrate, puberulent beneath; inflorescence pubescent; 
involucre campanulate-cylindric, 8 mm. high ; scales obtuse or 
mucronate, ciliate. Abundant in swamps in central Illinois; Cham- 
paign, Gleason 2843. 
3. Foliage glabrous; leaves ample, 8-15 cm. long, 1.5-2.7 cm. 
wide, sharply and saliently dentate, the lateral veinlets prominent; 
inflorescence large, open, irregular; heads numerous; involucre as 
in the type; scales in few series, sharply acute or short-acuminate, 
ciliate.  Pammel 32, from Clinton, Iowa, is an example of the 
form, to which, in fact, most of the herbarium material examined 
belongs. 
. Leaves broader, ovate-lanceolate, 3-5 cm. in width, sharply 
serrate, reticulately veined, sparsely puberulent beneath; inflores- 
cence loose, irregular; involucre 8 mm. high, campanulate; scales 
closely imbricated, acute, puberulent on the back. In dry ground, 
central Illinois: Urbana, Gleason 2880. 
Distribution: From western Ohio west to southeastern Minnesota 
and eastern Nebraska, thence south into Indian Territory. 
81. Vernonia illinoensis sp. nov. 
Erect, simple or branching above, ro-15 dm. tall; stem usually 
purple, finely tomentose or pubescent; leaves spreading, firm, 
lanceolate or ovate-lanceolate, 6-15 cm. long, 1.5-4 cm. ee 
long- oe sharply and irregularly serrate, narrowed to a ses- 
sile base short-petioled, dark-green and more o1 less pees 
above, ae and tomentose, or pubescent with fermginous ha 
beneath; inflorescence flattened or concave, 1-5 dm. across; oS 
duncles tomentose ; heads sessile and_ short- Sc. an 
flowered; involucre broadly campanulate or hemispheric, 6 mm. 
the tip, frequently mucronate, slightly pubescent or glabrous on 
the back, arachnoid-ciliate, the Ce portion purple; achenes 
furrowed, nearly glabrous, 4 mm. long; pappus purple or rarely 
tawny, 6-8 mm. long, the outer series ety lighter in color. 
Type: Gleason 2865, from Champaign, Illinois; in the herbarium 
of the New York Botanical Garden. 
Distribution: Iowa, Illinois, Indiana, Michigan, Ontario and 
Ohio, following the eastern arm of the Prairie province. 
Morphologically V. z@/¢zoenszs stands very close to V. missurica, 
and extreme forms resemble that species so closely that they can 
not be distinguished from it by morphological structure alone. 
