198 The Ohio Journal of Science [Vol. XXI, No. 6, 



Fig. 21. A flower from the middle of the transition zone of the inflorescence 

 showing petals of intermediate size, somewhat reduced stigmas, and 

 the vestigial stamens considerably enlarged. 



Fig. 22. A flower from near the top of the transition zone next to the typical 

 staminate part, showing rather large petals, stigmas decidedly 

 reduced, and stamens of an intermediate size between the vestiges of 

 the carpellate flowers and the typical stamens of the staminate flowers. 



Fig. 23. A staminate flower from above the transition zone of the inflorescence 

 just before the petals open and the filaments elongate, showing normal 

 stamens and vestigial stigmas. The larger petals have been removed. 



Fig. 2-1. A single petal from the staminate flower of Fig. 23, showing its large size 

 when compared with the vestigial petals of the carpellate flowers. 



Plate II. 



Zizania aquatica L. 



Fig. 25. A stamen and vestigial gynecium of a flower from the lower or staminate 



part of the panicle. 

 Fig. 26. The vestigial gynecium from Fig. 25 highly magnified, showing the three 



vestigial stigmas, the one much smaller than the other two. 

 Fig. 27. A bisporangiate flower from the transition zone of the panicle showing 



a gynecium with stigmas of nearly normal size and character and 



normal stamen. Five similar stamens were removed. The spikelet 



had an awn of half length. 

 Fig. 28. Gynecium and andrecium of mature carpellate flower from the upper. 



carpellate part of the panicle, showing the vestigial stamens and the 



normal stigmas. 

 Figs. 29-34. Spikelets from the staminate part of the inflorescence thru the 



transition zone to the carpellate part, showing the sex limited nature 



of the awn, 29 and 30 are staminate, 31 and 32 are bisporangiate, and 



33 and 34 are carpellate. 



Salix amygdaloides And. 



Fig. 35. A typical staminate flower from the lower, staminate part of the catkin. 



Fig. 36. A normal gynecium with three stigmas from the upper, carpellate part 

 of the catkin. 



Fig. 37. A normal gynecium with two stigmas. 



Fig. 38. A bisporangiate flower from the broad transition zone between the 

 staminate and carpellate parts of the catkin. The anthers on fila- 

 ments are yellow, while the anther growing out of the side of the 

 ovulary is of a brownish color characteristic of the preserved ovulary. 



Fig. 39. A bisporangiate flower from the transition zone. 



Fig. 40. A flower from the top of the staminate part or at the base of the 

 transition zone, showing four normal stamens and an elongated struc- 

 ture with a dark color, with two microsporangia near the tip. 



Fig. 41. A bisporangiate flower with one normal stigma and one stigma much 

 reduced because of the presence of a microsporangium immediately 

 below it. 



Fig. 42. A bisporangiate flower from the transition zone of a catkin, showing a 

 microsporangium on the side near the top of the ovulary and a stamen 

 below. 



Fig. 43. A bisporangiate flower with two short stamens arising from near the 

 base of the ovulary and three microsporangia just below the stigmas. 



Fig. 44. A structure, part carpellate and part staminate, from the transition zone. 



Fig. 45. An abnormal flower with a confusion of staminate and carpellate parts. 



Fig. 46. A flower showing distorted staminate and carpellate structures. 



Fig. 47. A distorted structure, partly staminate and partly carpellate. 



Fig. 48. A carpel-like structure with an imperfect stigma and two abnormal 

 anthers near the top. 



Fig. 49. An imperfect carpellate flower from the top of the transition zone, 

 showing three imperfect stigmas and two small microsporangia. 



Fig. 50. A carpellate flower from the top of the transition zone, showing two 

 small stamens and an abnormal stigma from the side of the ovulary. 



Fig. 51. A partly matured ovulary with seeds and with dried-up anthers on one 

 side. From the base of the carpellate part of the catkin. 



