124 The Ohio Journal oj Science [Vol. XVIII, No. 4, 



List of a few monecious and diecious species with notes on 

 the condition of the reciprocal organs in the two types of flowers: 



Sagittaria latifolia Willd. Monecious, occasionally diecious. The 

 staminate flower has prominent vestigial carpels, only slightly different 

 from the fertile carpels of the carpellate flower. The carpellate flower 

 has minute vestiges which, no doubt, represent stamens. 



Sagittaria rigida Pursh. Monecious. The condition of the flowers is 

 the same as in S. latifolia. 



Phoenix dactylifera L. The carpellate flower has six vestigial 

 stamens; the staminate flower has three vestigial carpels. 



Cocos nucifera L. Monecious. The carpellate flower has six minute 

 vestigial stamens, one or more of which occasionally develop nearly 

 normal anthers; the staminate flower has three prominent, only slightly 

 united, vestigial carpels. 



T3^ha latifolia L. Monecious. The flowers are much reduced and 

 neither type shows any vestiges of the opposite organs. More primitive 

 related genera, belonging to the PandanacccC, show vestigial structures. 



Ariseema triphyllum (L.) Torr. More commonly diecious. Spadixes 

 occur which have only carpellate flowers; some have carpellate flowers 

 with a few imperfect staminate flowers at the top; some have normal 

 carpellate flowers below and normal staminate flowers above; some are 

 almost entirely staminate with two or three normal carpellate flowers 

 situated in about the middle of the spadix; and some are entirely 

 staminate. 



Panicum virgatum L. Each spikelet contains a bisporangiate and a 

 staminate flower. 



Zizania aquatica L. Monecious; with staminate spikelets below 

 and carpellate spikelets above, on the inflorescence; the carpellate 

 spikelet contains six vestigial stamens; the staminate spikelet contains 

 a vestigial g>mecium. In the transition tissue there are normal, bispor- 

 angiate spikelets. The awns are sex-limited, depending on the degree 

 of the carpellate condition. 



Andropogon furcatus Muhl. In each pair of spikelets, the sessile 

 spikelet is bisporangiate; the stalked spikelet is staminate with a 

 vestigial g}mecium. 



Tripsacum dactyloides L. Monecious; with the carpellate spikelets 

 below and the staminate above. The carpellate flower with three 

 vestigial stamens; the staminate flower with a vestigial gynecium. 



Smilax hispida Muhl. Diecious. The carpellate flower has six 

 vestigial stamens; the staminate flower contains no vestige of the 

 gynecium. 



Dioscorea villosa L. Diecious. The carpellate and staminate 

 flowers contain vestiges. 



Thalyctnim dasycarpum Fisch. & Lall. On the same plant may be 

 found purely carpellate flowers, purely staminate flowers, carpellate 

 flowers with one stamen, staminate flowers with one carpel, and all 

 gradations between, some flowers having about half of each kind of 

 organs. Some species of Thalictrum are diecious. 



