484 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
forms, here plants of Pontederia are daily bathed, or even flooded, 
by tide water. 
EXPLANATION OF PLATES 14 AND 15 
PLATE 14. Pontederia cordata: at the left, a short-styled spike, longest and 
mid- dem stamens protruding from the perianth tube; in the center, mid-styled 
Spike, long stamens only exserted, style-tip barely protruding from tube; at the 
right, d лен PUR stamens only slightly protruding in throat of 
tube, s exserted and about as long as the perianth segments. Photographed 
I0 Aug. aa about p. fourths natural size. 
ATE I5. Spike of the mid-styled form visited by the least skipper, Ancy- 
loxypha numitor; донара at Arcola, №. J., 15 Aug. 19 
The drawings for all the text figures were made with н, aid of the camera 
lucida, figures 1—4, 9, 10, and 12 from material preserved in formalin, figure 11 from 
fresh flowers. 
