154 Rhodora [Avausr 
Basal leaves small, 2 to 5 cm. long, spatulate or obovate-spatulate, acute 
or obtuse. 
Bracts linear or linear-lanceolate, chartaceous below, petaloid or scarious 
above, the outer acute or obtuse, the inner attenuate, 4. canadensis. 
Bracts linear-oblong, with broad white petaloid tips s 
A. canadensis, var. Rava, 
Basal leaves and those at the tips of the stolons dull above, invested with 
tomentose or arachnoid pubescence, only the very oldest leaves becoming 
glabrate. 
Basal leaves mostly long, 5 to 12 (in reduced specimens rarely 4.5) cm. in 
length. (Large specimens of 4. Brainmerdii might be looked for 
here.) 
Heads comparatively small, involucre averaging 7 (6 to 8) mm. high: 
stems slender. 
Basal leaves obovate, with rounded or obtuse tips. A. plantaginea. 
Basal leaves from mv" to oblanceolate, with acute or 
acutish tips . . . A. plantaginea, var. petiolata. 
Heads comparatively large, averaging 9 (8 to 10.5) mm. high: stems 
stouter. 
Basal leaves mostly broadly obovate or rhombic-obovate, tapering 
gradually to blunt or acutish tips. 
Stems 1 to 2.5 dm, high, bearing some purple glandular hairs 
above: cauline leaves rather crowded, nearly or quite to 
the subcapitate inflorescence. . A. ambigens. 
Stems taller, 2.5 to 4 dm. high, not glandular: cauline leaves 
rather remote . . : A. fallax. 
Basal leaves from es to narrowly obovate- -spatulate, with 
rounded tips . . A. Farwellii. 
Basal leaves small, 2 to 5 cm. long. (4. petaloidea with slightly developed 
stolons might be looked for here. ) 
Basal leaves spatulate, with little or no differentiation of blade and 
petiole: involucre lemon-tinged . . A. rupicola. 
Basal leaves with more distinct petioles and obovate blades: involucre 
not lemon-tinged. 
Stems bearing purple glandular hairs . : ; A. Brainerdit. 
Stems without glands. 
Cauline leaves linear-attenuate, rather small and inconspicuous, 
3 mm. or less wide: involucral bracts with scarious tips. 
Outer bracts obtuse . . . . A. neodioica. 
All the bracts long-attenuate — . A. neodioica, var. attenuata, 
Cauline leaves oblanceolate or oblong-lanceolate, larger and 
more conspicuous, 5 to 8 mm. wide: bracts with petaloid 
tips . . A. neodioica, var. grandis. 
Stolons, when well developed, procumbent : basal leaves from cuneate-spatulate 
to obovate, 4 (rarely 5) cm. or less in length. 
Heads in a iios ER loose corymb. 
Involucral bracts with conspicuous blunt or acutish petaloid white tips 
A. petaloidea. 
Involucral bracts scarious, long-attenuate y A. petaloidea, var. scariosa. 
Heads sessile or subsessile in subcapitate clusters, or distinctly racemose  . 
A. neglecta. 
The very large number of specimens recently examined from vari- 
ous parts of New England fall so readily within the defined limits of 
the species here enumerated, that, although it may yet be necessary to 
recognize some minor forms, confidence is felt that a very satisfactory 
