22 
ovate and semi-cordate. Southern N. H„ A. A. Eaton; frequent 
along our northern border. 
c. Var. obliquum; sterile segments having ultimate divisions 
obliquely lanceolate. 
d. Var. dissectum; ultimate divisions dissected into numerous 
narrow divisions. 
In New England, varieties c and d of this variable species are 
abundant, in pastures and on hillsides, fruiting best in sunny sit- 
uations, and one or more varieties are native to nearly every part 
of the earth. 
As all the Botrychiums are perennial, surviving many years, 
the plants reach their best development along walls and similar 
situations, being there more protected from injury. Plants are 
sometimes found with two or even three fertile segments and oc- 
casionally with two sterile segments. Middle of September. 
Illustrated in Gray’s Manual, and varieties in Eaton’s Ferns. 
182. B. lanceolatum (Gmel ) Angs. Frond 2-10 inches high ; 
both sterile and fertile segments sessile at the top. of the common 
stalk : sterile segment not at all fleshy, triangular, ternately pin- 
natifid, like a reduced sterile segment of B. Virginianum. Damp 
shaded soil, especially near brooks. Not common, but yet proba- 
bly often overlooked 
This species grows in damper situations than B. matricarwfo- 
lium and is to be looked for in low ground, especially when B. Vir- 
ginianum is near at hand. Often found in the shade of the tall 
form of Onoclea sensibilis. 
V 
183. B. Virginianum (L.) Swartz. Eattlesnake Fekn Ster- 
ile segment triangular, ternate, membranaceous, much divided, 
sessile at the center of the frond ; fertile segment decompound. 
Plant commencing to fruit when but a few inches high, but sur- 
viving many years, reaching at times the height of 30 inches, occa- 
sionally with a double panicle. Not rare in rich woods. Late June. 
North America generally, Norway, Himalaya Mts., Australia. 
Illustrated by Meehan, Series n, Vol. 1. 
