GENUS i. 



ADDER'S TONGUE FAMILY. 



6. Botrychium obliquum Muhl. , 

 Ternate Grape-fern. Fig. 9. 



Botrychium obliquniii Muhl. ; Willd. Sp. PL 5 : 63. 1810. 

 Botrychium ternatum var. obliquum D. C. Eaton, Ferns N. 

 Am. i : 149. 1878. 



Leaves 6'-2o' long, usually robust, the common stalk 

 short and under ground ; bud pilose, the sporophyl and 

 sterile blade bent down. Sterile blade usually long- 

 stalked, commonly 2 '-5' broad, subpentagonal, subter- 

 nately 3-pinnatifid, or 3-pinnate below, the principal 

 divisions stalked; ultimate segments obliquely ovate or 

 oblong-lanceolate, acutish, the terminal ones elongate, 

 i'-i' long; margins variously serrulate-dentate; sporo- 

 phyl long-stalked, 3-4-pinnate, usually stout. 



In moist woods and thickets, or open slopes, New Bruns- 

 wick to Florida, Missouri and Minnesota. Very variable 

 especially in New York and New England. Several forms 

 have the divisions of the sterile blade longer-stalked and 

 lax, with fewer and rounded segments, or the segments 

 usually long and acute. 



7. Botrychium dissectum Spreng. Cut- 

 leaved Grape-fern, or Moonwort. Fig. 10. 



Botrycliium dissectum Spreng. Anleit. 3: 172. 1804. 

 Botrychium tcrnatit/n var. dissectum D. C. Eaton, 

 Ferns N. Am. i: 150. 1878. 



Leaves 8'-i6' long, usually slender, the com- 

 mon stalk short, under ground ; bud pilose, the 

 sporophyl and sterile blade both bent down. 

 Sterile blade long-stalked, subpentagonal, rarely 

 more than 6' broad, subternately divided, the 

 basal divisions .unequally and broadly deltoid, 

 decompound, the upper and secondary pinnae 

 deltoid-lanceolate, pinnate, with laciniate or deeply 

 cut pinnules, the ultimate divisions divergent, 

 narrow and incised ; sporophyl 2-4-pinnate, usually 

 long-stalked. 



In low woods and thickets or wooded slopes, 

 Maine to Virginia, Kentucky and Indiana. Con- 

 gested forms closely resemble the preceding. 



8. Botrychium matricariae (Schrank) 

 Spreng. Grape-fern. Fig. n. 



Osmunda matricariae Schrank, Baier. Fl. 2: 419. 1780. 

 Botrychium rutaceum Sw. Schrad. Journ. Bot. i8oo 2 : 



no. 1801. 



Botrychium matricarioides Willd. Sp. PI. 5: 62. 1810. 

 Botrychium rutaefolium A. Br. in Doell, Rhein. Fl. 24. 



1843. 



Leaves single or in pairs, the fertile 3 '-7' long, 

 usually slender, fleshy, coriaceous in drying, some- 

 what glaucous, the common stalk \'-2.' long, wholly 

 under ground ; bud densely pilose, both sporophyl 

 and sterile blade bent over. Sterile blade stalked 

 (f'-2'), triangular or subpentagonal, i'-2' broad, 

 nearly as long, subternately divided, 2-,3-pinnate, the 

 basal pinnae nearly equalling the middle division, 

 the ultimate divisions few, oval or obliquely ovate, 

 rounded, the margins obscurely crenate or sinuate; 

 sporophyl long-stalked, large, 2-3-pinnate. 



In old meadows and upon open hillsides, Labrador and 

 Newfoundland to New Brunswick, northern New Eng- 

 land and New York. Reported from northern Michigan, 

 Also in Europe. Aug.-Sept. 



