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number of “ Pittonia”; I shall, however, add a description of the 
prairie plant of Nebraska, Kansas and Dakota, referred to in Prof. 
Greene’s paper. As far as] know the species at present, I shall ar- 
range them as follows: 
Heads sessile at the ends of short leafy branches resembling the stolons. 
: A, rosulata. 
Heads in cymose or subcapitate clusters, or solitary on evident erect stems. 
Basal leaves and those of the stolons narrowly oblanceolate ; bracts generally 
rose-color. A, parvifolia. 
Basal leaves and those of the stolons spatulate or obovate. 
Basal leaves .5—4 cm. long and less than 1.5 cm. wide, one-ribbed or indis- 
tinctly three-ribbed. 
Heads 5—7 mm. high. 
Plants less than 1.5 dm. high; heads in subcapitate clusters. 
Bracts of the pistillate plant dark greenish brown, acute or 
acuminate. A, alpina. 
Bracts of the pistillate plant umber, obtuse. 
; A. umbrinella, 
Plants generally over 2 dm. high; heads in an open cyme. 
Basal leaves 14-1 cm, long; stem leaves linear. 
A, microphylia, 
Basal leaves 2~3 cm. long; stem leaves spatulate, broadly ob- 
long and ovate-lanceolate, A. pedicellata. 
Heads about 1 cm. high. 
Basal leaves broadly spatulate, with a distinct petiole, generally 
tomentose on both sides; bracts of pistillate plant obtuse, or 
the innermost seldom acute. A, dioica. 
Basal leaves more glabrate above, without distinct petiole; bracts 
of pistillate plant acute or acuminate, or the outermost ob- 
tuse. 
Stem slender, 2-3 dm. high; stolons very tue basal leaves 
narrowly cuneate, A, neglecta, 
Stem stout, short, about 1 dm. high; stolons short; basal 
leaves obovate. A, campestris. 
Basal leaves over 4 cm. long and 1.5 cm. wide, prominently 3 ribbed. 
Heads cymose; bracts of pistillate plant lanceolate. 
Basal leaves waist cuneate without distinct petiole. 
A. Howellii. 
Basal leaves oval with a distinct petiole. A. plantaginifolia. 
Head solitary; bracts of pistillate plant almost linear. 
A, solitaria. 
Heads racemose or paniculate. A. racemosa. 
ANTENNARIA ROSULATA. 
Antennaria dioica var. congesta Gray, aye Fi. it: pt. 2, sae 
At least in part. 1884. Not DC, 
