36 Karl M. Wiegand and Arthur J. Eames 



2. B. matricariaefolium A. Br. (B. ramosum (Roth) Asch. See Schinz, Vier- 



teljahresschrift Naturf. Gesell. Zurich, 61 : 416. 1916.) Grape Fern. 



Grassy open woodlands, in gravelly soil; frequent. June 15-July. 



North Spencer, hill n. w. of station ; Bull Hill, Newfield ; Six Mile Creek ; 

 Ringwood ; Freeville Bog; McLean Woods; Malloryville Bog (D. in C. U. Herb.) ; 

 near Townley Swamp and near Wyckoff Swamp ; near Turtle Pond ; rich woods, 

 Featherbed Bog ; Botrychium Woods, Spring Lake. 



E. Que. and N. S. to S. Dak., southw. to Md. and Nebr. ; less frequent on the 

 Coastal Plain. Found also in Wash, and in Eu. 



3. B. angustisegmentum (Pease & Moore) Fernald. (See Rhodora 17:87. 1915. 



B. lanceolatum of authors.) Grape Fern. 



In situations similar to those of the last-named species, and often growing with it; 

 frequent. July. 



The narrows between Slaterville and Caroline Center ; hill s. w. of West Danby ; 

 Danby (D. in C. U. Herb.) ; s. e. of Etna; McLean Woods; Townley Swamp; Bo- 

 trychium Woods, Spring Lake ; near Featherbed Bog. 



N. S. to Alaska, southw. to N. J., Ohio, Colo., and Wash. ; rare on the Atlantic 

 Coastal Plain. Found also in Eurasia. 



4. B. dissectum Spreng. (See Rhodora 23:151. 1921.) Grape Fern. 



Damp or dry turf and moss in old pastures, over neutral or acid gravels ; fre- 

 quent. Aug 15-Sept. 



Spencer Lake; Ellis Hollow; e. of Freeville and n. of McLean (D. in C. U. 

 Herb.) ; Townley Swamp; near Junius marl ponds; e. of Featherbed Bog; Botrych- 

 ium Woods, Spring Lake. 



N. B. and N. S. to Minn., southw. to Fla., Mo., Ark., and Mex., including the 

 Atlantic Coastal Plain. 



A form with the segments of the frond merely crenate is forma obliquum (Muhl.) 

 Fernald (see Rhodora 23:151. 1921). It has been found, often with the typical 

 form, at the following localities: hills of West Danby; n. w. of Spencer Lake; 

 hills of Brookton; Enfield Glen; Richford; Ringwood; McLean region; Beaver 

 Brook ; Townley Swamp ; Botrychium Woods, Spring Lake. 



5. B. ternatum (Thunb.) Sw., var. intermedium D. C. Eaton. 



In situations similar to those of the last-named species and growing with it, per- 

 haps more often in sandy soils ; rare. 



Botrychium Woods, Spring Lake (F. P. Metcalf & A. H. Wright). 

 N. N. E. to B. C, southw. to Mass., N. Y., and Oreg. 



6. B. virginianum (L.) Sw. Rattlesnake Fern. Grape Fern. 



Dry or moist gravelly or sandy, often alluvial, woodlands, with little reference 

 to lime content of the soil ; frequent, and widely distributed. May 20-June. 



Lab. to B. C, southw. to Fla., La., Ariz., and Wash., including the Atlantic Coastal 

 Plain, where it is common. Found also in Mex., W. I., and Eurasia. 



6. EQUISETACEAE (Horsetail Family) 

 1. Equisetum (Tourn.) L. 



a. Stems annual, mostly soft and pliant, at least the sterile ones usually with whorls 

 of branches and excurrent ; spikes blunt. 

 b. Sheaths on the main stem with 8-12 teeth; central cavity of stem 1/6 to 2/3 

 diam. of stem; stem with prominent vallecular canals. 

 c. Stems dimorphic, the early ones fertile, succulent, brown or flesh-colored, the 

 later ones much branched and greener. 



