52 DorRSEY: VARIATION IN FLORAL STRUCTURES OF VITIS 
Fic. 11-18. A series of photomicrographs of median sections through pistils 
having stigmatic tissue developed in different degrees. 
PLATE 3 
Fic. 19-24. A continuation of the series 11-18, PLATE 2, showing median sec- 
tions through the pistils of the grape; these would usually be classed as staminate 
flowers. 
IG. 21, 22, 23, and 24 are median sections of unopened buds showing the relative 
position of the calyx, corolla, stamens, and pistil. The crouched position of the fila- 
ments is shown in FIG. 22. 
Fe ale ec at 
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