94 Rhodora [May 
nospermoides Greene, Pittonia, v. 75 (1902).— A well marked species 
of the lower Mississippi basin, differing from S. leptocephala Torr. & 
Gray in its more copious fastigiate branching; its linear-attenuate 
strongly glutinous leaves at most 2-3 mm. broad, instead of linear- 
lanceolate, merely acute, and 4-6 mm. wide; and the involucre 
extremely viscid. 
ASTER depauperatus (Porter), n. comb. A. ericoides, var. pusillus 
Gray, Syn. Fl. i. pt. 2, 184 (1884). А. ericoides, var. depauperatus 
Porter, Mem. Torr. Bot. Cl. v. 323 (1894).— This delicate plant of 
serpentine barrens of southern Pennsylvania and adjacent West 
Virginia is readily separated from A. ericoides by its very slender stem; 
its tiny rameal leaves; and especially by the turbinate, not companu- 
late nor hemispherical, involucre only 2-3 mm. broad; and by its 
much less rigid bracts. Іп richer soil westward it is represented by 
Var. parviceps (Burgess), п. comb. A. ericoides, var. parvice ps 
Burgess in Britton & Brown, Ш. Fl. iii. 379 (1898). This is a stouter 
plant with densely white-villous stems and broader leaves, but with 
the heads as in the typical form of A. depauperatus or slightly larger. 
It occurs on prairies or in woods of Illinois and Missouri. 
ASTER LATERIFLORUS (L.) Britton, var. bifrons (Gray), n. comb. 
A. diffusus, var. bifrons Gray, Syn. Fl. i. pt. 2, 187 (1884). А. lateri- 
florus, var. grandis Porter, Mem. Torr. Bot. Cl. v. 324 (1894). 
GNAPHALIUM POLYCEPHALUM Michx., var. Helleri (Britton), n. 
comb. G. Helleri Britton, Bull. Torr. Bot. Cl. xx. 280 (1893).— 
This seems to differ from G. polycephalum only in its glandular-viscid 
stems and to be, therefore, only of varietal value. 
CrrstuM iowense (Pammel), n. comb. Cnicus iowense Pammel, 
Proc. Iowa Acad. Sci. viii. 231 (1901).— Cnicus L. Sp. 826 (1753) 
is now generally accepted as a monotypic genus, its only species being 
the Blessed Thistle, Cnicus benedictus L. By a few recent American 
botanists our thistles with plumose pappus are united with the Old 
World genus Carduus L., which has the:bristles plumeless; but the 
writer finds himself in agreement with DeCandolle, Bentham and 
Hooker, Gray, Engler, Hoffmann, and many others in keeping the 
two apart. The earliest designation of the thistles with plumose 
pappus is apparently Cirsium Hill. Brit. Herbal, 427 (1756). 
CIRSIUM UNDULATUM (Nutt.) Spreng., var. megacephalum (Gray), 
n. comb. Cnicus undulatus, var. megacephalus Gray, Proc. Am. 
Acad. x. 42 (1874). Carduus undulatus, var. megacephalus Porter, 
Mem. Torr. Bot. Cl. v. 345 (1894). 
