31 
V 
217 - S. apus (L.) Spring. Stems tufted, small and slender, 
creeping, and much branched ; leaves of two kinds, in four rows, 
those in the side rows larger and spreading, the others very small 
and appressed. Damp places in meadows ; most frequent in south- 
ern portions of New England. Middle of September. Only in the 
United States east of the Rocky mountains. 
This species has seldom been figured. 
FAMILY VI, HARSILEACE/E R. Br. 
A QUATIC, creeping perennials, with either filiform or four- 
parted leaves. Fruit borne on peduncles arising from the 
rootstalk ; sporocarps containing two kinds of spores. Con- 
sists of two genera, one of which is represented with us by a sin- 
gle species. 
MARSILEA L. 
221. M. quadri folia L. Leaves long petioled, four-parted; 
leaflets deltoid, glabrous, usually floating ; sporocarps on short 
peduncles from near the base of the petioles. Muddy shores. Ban- 
tam Lake, Litchfield, Conn., whence it has been introduced into 
several localities, among others, Lake Whitney, Conn , and Cam- 
bridge and Concord rivers, Massachusetts. August. Central Eu- 
rope and Asia. 
Illustrated by Meehan, Series i, Yol. 2. 
