102 Karl M. Wiegand and Arthur J. Eames 



3. E. viridi-carinatum (Engelm.) Fernald. (E. polystachyon of Cayuga Fl.) 



Cotton Grass. Wool Grass. 



Bogs and meadows, mostly in calcareous soils ; frequent. May 20-July IS. 



W. of Key Hill ; Larch Meadow ; Fir Tree Swamp between Slaterville and Dryden ; 

 Freeville ; Mud Creek, Freeville ; Malloryville ; McLean Bogs ; n. of McLean ; 

 Beaver Brook; Turtle Pond; Miller Bog, Spring Lake; Westbury Bog. 



Newf. to Sask. and B. C, southw. to Conn., N. Y., Ohio, Mich., Wis., Oreg., and in 

 the mts. to Ga., including the northern Atlantic Coastal Plain. 



4. E. virginicum L. Cotton Grass. Wool Grass. 

 Acid soil of peat bogs ; frequent. Aug.-Sept. 



Freeville Bog (D.) ; Woodwardia Bog (DA); Malloryville Bog (DA.); McLean 

 Bogs (DA.) ; Junius peat bogs (DA.) ; bog n. of Duck Lake; Featherbed Bog. 



Newf. to Ont. and Man., southw. to Fla. and Nebr. ; common on the Coastal 

 Plain. 



Plants with white wool (forma album (Gray) Wiegand, see Rhodora 26:2, 1924, 

 E. v., var. album Gray) occur occasionally. 



8. Rynchospora Vahl 



a. Spikelets white or tawny-white, the upper ones densely clustered ; fertile flower 1 ; 



stamens 2; bristles 9-12 or more. 1. R. alba 



a. Spikelets castaneous, 3-6 together ; fertile flowers several ; stamens 3 ; bristles 6 



(rarely 12). 2. R. capillacea 



1. R. alba (L.) Vahl. Beak Rush. 



Boggy soil, either in acid peat bogs or in marl ; frequent. July-Sept. 15. 



Summit Marsh ; marly place w. of Key Hill ; Larch Meadow ; Freeville Bog ; 

 McLean Bogs ; Junius, in the peat bogs and also on the marl moor ; Miller Bog, 

 Spring Lake; Featherbed Bog. 



Newf. to Alaska, southw. to Fla., Ky., the Great Lakes, Idaho, and n. Calif., 

 including the Atlantic Coastal Plain. Found also in Eurasia. 



2. R. capillacea Torr. Beak Rush. 

 Marl meadows ; rare. July-Aug. 



""Junius" (Sartwell) ; Junius marl ponds (DA.). 



E. Que. to w. Ont., southw. to n. N. J., Pa., Ohio, Mich., and Mo. ; rare or absent 

 on the Coastal Plain. 



9. Mariscus (Hal.) Zinn. 



1. M. mariscoides (Muhl.) Kuntze. (See Rhodora 25:49. 1923. Cladium maris- 

 coides (Muhl.) Torr.) 



Shallow water about the sandy and often boggy calcareous shores of ponds; rare. 

 July 20-Sept. 



Summit Marsh (D.\) ; Chicago Bog (D.) ; moor of Junius marl ponds (£>.!); 

 prairie s. of Westbury Bog ; Miller Bog, Spring Lake ; Slayton Pond. 



N. S. to Ont. and Minn., southw. to Fla., Ky., Ind., and Iowa; especially frequent 

 on the Coastal Plain. 



The influencing factors in the distribution of this species are not clear. Though 

 in this flora, except for the Chicago Bog station, the species is distinctly a marl plant, 

 in eastern Mass. it apparently inhabits acid ponds, and in N. J. it is characteristic of 

 the pine barrens but not of the chestnut middle-belt nor of the coastal strip. It is 

 probably dependent on the presence of various salts. 



