HAZEN: TRIMORPHISM AND INSECT VISITORS ОҒ PONTEDERIA 471 
the middle of the ovary (FiGs. 7, 8). Often even in a young ovary 
these cells abut on small schizogenous cavities, as at с” іп F1G.7, 
and in older sections of Pontederia montevideensis, where they are 
more extensively developed, the cavities may form elongated 
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Fics. 6-10. 6. Section through lower half of ovary, short-styled form (X 57). 
. Section through ipsins part of same ovary (X 100). 8. Longitudinal diagram 
of similar ovary, constructed from threee sections (X 35); from buds 3 mm. long. 
9. Curved дай po mid-styled flower with small and mid-size pollen grains 
n the stigma (X 35). ro. Six-parted stigma of long-styled flower, 
three of its пада lying behind those shown; epidermal cells indicated only at 
the top; below the elongated subepidermal idioblasts, shaded (X 37). а, antho- 
cyanin idioblasts, shaded, mostly subepidermal; b, bundles of raphides; c, groups of 
secretory cells, at с” abutting on small schizogenous cavities; d, embryosac; e, empty 
loculi; n, septal nectaries. 
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canals lined with secretory cells. The fact that these cells appear 
to be functional long after these of the septal nectaries cease to 
show any trace of secretion indicates that they may belong to a 
quite different category. 
