300 



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 I 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. rosttlata. 

 Heads in cymose or subcapitate clusters, or solitary on evident erect steins. 



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. uvibrinella. 

 Plants generally over 2 dm. high ; heads in an open cyme. 

 Basal leaves y^-i cm. long; stem leaves linear. 



A. microphylla. 

 Basal leaves 2-3 cm. long; stem leaves spatulate, broadly ob- 

 long and ovate-lanceolate. A. pedicellata. 

 Heads about I 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 long; basal leaves 



narrowly cuneate. A. neglecta. 



Stem stout, short, about I 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 broadly cuneate without distinct petiole. 



A. Howellii. 

 Basal leaves oval with a distinct petiole. A. plantagitiifolia. 



Head solitary; bracts of pistillate plant almost linear. 



A. solitaria. 

 Heads racemose or paniculate. A. racemosa. 



Antennaria ROSULATA. 

 Anteiinaria dioica var. congesta Gray, Syn. Fl. i: pt. 2, 233. 

 At least in part. 1884. Not DC. 



