CYPERACEAE I 63 



5. Eriophorum L. 



Spikelet solitary; involucral leaf short or none. 



Bristles 6, simple, white, crisped. 1. E. alpinum. 



Bristles 6, each 4-6 cleft, thus appearing numerous. 2. E. callithrix. 



Spikelets several, involucrate by 1- «3 leaves. 

 Leaves triangular-channelled throughout. 



Blade of the upper stem-leaf not longer than the 



sheath. 3. E. gracile. 



Blade of the upper stem-leaf much longer than the 



sheath. 4. E. tenellum. 



Leaves flat, at least below the middle. 



Scales with a prominent midvein; stamens 3. 5. E. viridicarinatum . 



Scales striate-nerved; stamen I. 6. E. virginicum. 



1. E. alpinum L. {Scirpus hudsonianus (Michx.) Fernald). In 



bogs and on high mountains: Newf. to Hudson Bay and Br. 

 Col. to Conn., northern N. Y. and Mich. Also in Europe 

 and Asia. 



Known in our area only from northern Tolland and Windham 

 counties, Conn., perhaps elsewhere northward. 



2. E. callithrix Cham. (E. vaginatum Torr. not L.). In bogs: 



Newf. to Alask., south to Mass., Pa., Wise, and Manitoba. 



Also in Asia. 



Conn. Rare in the northern tier of counties, not recorded else- 

 where. 



Pa. Mountains of Monroe and Wayne counties. 



Tertiary, 0: Cretaceous, o: Older Formations, rare northward. 



123-138 days. 780-2,900 ft. 



3. E. gracile Koch. In bogs: Que. to Br. Col., N. Y., Pa., Iowa, 



Neb., Col. and Cal. Also in Eu. and Asia. 

 Conn. Throughout. 



N. Y. Rare in the Bronx and Westchester Co., unknown elsewhere. 

 N. J. Rare in Gloucester Co., thence increasing northward; not 

 in the pine-barrens. 



4. E. tenellum Nutt. In bogs: Newf. to Hudson Bay, N. J., 



Pa., and 111. Often confused in local catalogs with the similar 

 E. gracile Koch. 



Throughout most of the range, local southward, increasing 

 northward; unknown from S. I. 



5. E. viridicarinatum (Engelm.) Fernald. (E. polystachyon lati- 



folium Gray). In wet meadows: Newf. to Br. Col., N. Y., 

 Ga., Ohio and Mich. 



