60 THE AMERICAN MIDLAND NATURALIST 



1 1 2 1 . Tessenia racemosa (Nutt.) Lunell, now comb. 

 Erigeron racemosus Nutt. Trans. Am. Phil. Soc. 7: 312. (1841). 

 Leeds, Devils Lake. 



1 122. Tessenia racemosa var. simplicissima Lunell, var. nov. 

 Stem at the end of the season 40 cm. long, very slender, simple, 



bearing 1-4 heads. 



Turtle Mountains: St. John. 



1 123. Tessenia racemosa var. arcuata Lunell, var. nov. 

 Branching freely from the base; the branches arcuate. Dry 



bottom of Lake Ibsen. 



LEPTILON Raf. Am. Month. Mag. 2: 268. (1818). 



1 1 24. Leptilon canadense (Linn). Britt. in Britt. & Br. 

 111. Fl. 3:391- (1898). 



Erigeron canadensis Linn. Sp. PI. 863. (1753). 



Leeds, Butte; Kulm (Brenckle). 



DOELLINGERIA Nees, Gen. & Sp. Ast. 176. (1832). 



1 125. Doellingeria umbellata pubens (A. Gray) Britt. in 

 Britt. & Br. 111. Fl. 3 : 392. (1898). 



Aster umbellatus var. pubens A. Gray, Syn. Fl. P: 197. (1884). 

 Turtle Mountains, Pleasant Lake. 



ANTENNARIA Gaertn. Fruct.&Sem. 2: 410, pi. 167. (1791); 

 R. Br., ace. to Bubani. 



Sexual Key. 



Group I. Both staminate and pistillate flowers found. These grow either 

 promiscue or in separate clumps, but in their own immediate proximity: 

 A angustiarum, A Lunellii, A microphylla. 



Group II. Both staminate and pistillate flowers found, but each kind is 

 growing alone, in localities widely separated from the other: 



A . chelonica. 



Group III. Only staminate flowers found: A . microphylla solstitialis. 

 Group IV. Only pistillate flowers found: A . aprica, A. aureola, A. aureola 

 roseata, A. oxyphylla. 



Analytical Key. 

 I. Heads 8-12 mm. high. 



A. Mature leaves glabrous above. 



1) Fertile plants tall, sterile low. Stolons elongated A. chelonica 



2) Fertile and sterile plant of equal length. Stolons 1-2 as 



long as the stem A. angustiarum 



B. Leaves small, permanently hoary pubescent above, at least 

 toward the margins A. Lunellii 



C. Leaves permanently tomentose on both sides. 

 \) Low, with obtuse pistillate bracts A. aprica 



