Ohio Journal of Science. 



Vol. XVII. Plate I. 



EXPLANATION OF PLATE L 

 •Figs. 1-3 photographs of living plant. Figs. 4 and 5 drawings made with 

 camera lucida, slightly reduced in reproduction. 



Fig. 1. Flower and leaves (one-third natural size) showing position and arrange- 

 ment of parts. 

 Fig. 2. Flower seen from above (one-half natural size) showing the parts of the 



perianth with the pistil in the center; the single stamen at the right. 

 Fig. 3. Flower with petaloid structures removed (natural size) showing three 



superposed whorls of sepals, with 4-lobed ovary in the center and single 



stamen at right. 

 Fig. 4. Diagram of cross section of ovary (x 4) showing tetramerous structure, 



placentae, and ovules. Position of petaloid structures shown by solid lines; 



position of uppermost whorl of sepals shown by dotted lines; position of 



stamen indicated at s. 

 Fig. o. a, Pollen grain, just shed, seen in optical sect'on, x 640. b, Pollen grain. 



about to germinate, surface view, x 640. 



