4 
ISOETACEAE 
Isoetes L. Quillwort. — 
echinospora Durieu. var. Braunii (Dur.) Engelm. 
Eatoni Dodge. 
Gravesii A. A. Eaton. 
Engelmanni A. Br. Other forms of Isoetes exist in this region 
but they have not been sufficiently studied. 

