ELODEACEAE 89 



9. S. latifolia Willd. N. B. and N. S. to Br. Col., Fla., Gal., Mex. 

 and Central America. 

 Common in some of its numerous forms throughout the range. 



10. S. Engelmanniana J. G. Smith. Mass., R. I., Conn, and N. Y. 



Conn. New London Co. 



N. Y. Lynbrook and Lake Ronkonkoma, L. I. (According to 

 Bicknell.) 



11. S. longirostra (Micheli) J. G. Smith. N. J. and Pa. to Fla. 



and Ala. 



N. J. Middlesex Co. and southward, especially in the pine-barrens. 



Pa. Delaware Co. 



Reported from but doubtfully in Conn. 



ELODEACEAE 



Leaves ribbon-like, floating, 15 cm. long or more; staminate flower 



with 1-3 stamens. 1. Yallisneria. 



Leaves not ribbon-like, submerged, 3 cm. long or less; staminate 



flowers (where known) with 9 stamens. 2. Philotria. 



i. Vallisneria L.* 

 I. V. spiralis L. In water: Nova Scotia to Va., Ind. and S. Dak. 

 Also in Europe and Asia. 



Throughout the range, apparently decreasing northward. 



2. Philotria Raf.* 



Leaves oblong or ovate-oblong, mostly obtuse. 1. P. canadensis. 



Leaves linear or oblong, acute. 



Leaves oblong or linear-oblong, 2-3 mm. wide; spathe of 



staminate flower 5-6 mm. long; anthers, 2-2.5 mm. long. 2. P. Nuttallii. 



Leaves linear, 1.5 mm. wide or less, staminate spathe 2-3 mm. 



long; anthers about I mm. long. 3. P. anguslifolia. 



1. P. canadensis (Michx.) Britton. Slow streams and ponds: 



Quebec to Va. and Minn. Also in Europe. 

 Reported from nearly throughout the range but no specimens are 

 at hand. Most of the old records of this species refer to P. 



angusti folia. 



2. P. Nuttallii (Planch.) Rydb. Slow streams: N. Y. to Va. 



N. Y. L. I. and S. I. and up the Hudson Valley to Fishkill. 

 N. J. Passaic Co. southward. 

 Pa. Chester and Philadelphia counties. 

 * See footnote, page 76. 



