I. W. Clokey — Carex Notes. 91 



Carex Paysonis belongs to the Atratce Kunth or Mel- 

 onanthce Drej. Though phyllopodic it is most closely 

 related to the aphyllopodic Carex spectabilis Dewey. 

 Mr. Theodore Holm, who has done so much to differ- 

 entiate the species in this part of the troublesome Atratce 

 Kunth. or Melonanthce Drej., has kindly examined some 

 of this material and places it "not far from Carex spec- 

 tabilis Dewey, but very distinct from this." Carex Pay- 

 sonis can be separated from the most closely related 

 species by the following key : 



Culms aphyllopodic 



Carex spectabilis Dewey 

 Carex montanensis Bailey 

 Carex venustula Holm 

 Carex macrochaeta C. A. Mey 

 Carex Tolmiei Boott 

 (As defined by Mr. Theodore Holm) 

 Culms phyllopodic 



Pistillate spikes 3-6, perigynia 3 mm. long 



Carex Tolmiei Boott 

 (As described in Rydberg's Rocky Mountain Flora) 

 Pistillate spikes 2-3 



Pistillate spikes filiform stalked, drooping 



Carex atrofusca Schk. 

 (Carex ustulata AVahl.) 

 Pistillate spikes erect, upper sessile, lower short pednncled 

 Scales with pale midvein extended into a short awn, longer 

 than the stipitate perigynia 



Carex microchceta Holm 

 Scales at most acute, uniform dark brown, midrib obso- 

 lete, shorter than the perigynia which is not stipitate 



Carex Paysonis 



EXPLANATION OF PLATE II. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



1 — Carex apoda. 

 2 — Idem pistillate scale. 

 3 — Id. pistillate scale. 

 4 — Id. perigynia. 

 5 — Id. aehene. 



Fig. 

 Fig. 

 Fig. 



6 — Id. perigynia, longitudinal section. 



7 — Carex Paysonis. 



8 — Idem staminate scale. 



Fig. 

 Fig. 

 Fig. 



9 — Id. pistillate scale. 

 10 — Id. perigynia. 

 11 — Id. aehene. 



Fig. 



12 — Id. perigynia, longitudinal section 



Drawings by Miss Eena Duthie. 



