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Isoetes echinospora Durieu.—Represented in our range by 
the following subspecies : 
I, echinospora Braunii (Durieu) Engelm.—WavnE, Saun- 
ders ; TACKAWANNA, Moosic Lake, and CarBon, Great 
Lake, Porter, CRAWFORD, Conneaut Lake, and ERIE, 
Presque Isle, Garder. 
I. echinospora robusta Engelm.—Bvcks, near Riegelsville, 
Ruth. 
I. Engelmannii A. Br.—In mud, chiefly about ponds and 
ditches, and on river shores. Monror, Tannersville and 
Water Gap, Porter; LEHIGH, near Bethlehem, Raz ; 
Bucks, Frezz. 
I, Engelmannii gracilis Engelm.—DELAWaRE, Tinicum; 
BUCKS. 
I. Engelmannii valida Engelm.—LAancasTER, Smithville, 
(original station), LEBANON, near Cornwall; HUNTINGDON, 
in a pond near Warrior’s Mark, Porter. 
I, riparia Engelm.—Along rivers. Bucks, near Tullytown, 
Fretz; PHILADELPHIA, C. £. Smith and Letdy; DELA- 
WARE, G. Smzth. 
