1gI19] STOUT—INTERSEXES 117 
INTERSEXES WITH FLOWERS UNIFORM 
‘No. rr (figs. 11, 12, 50).—The relative lengths of pistils and 
stamens in the flowers of this plant are quite as in the first form. 
The general appearance of the spikes in full bloom is quite similar 
(fig. 50), but the anthers are noticeably smaller and more narrow, 
and they are slightly greenish-yellow in color. Many anthers do 
not dehisce, and after 2 or 3 days they turn brown. A high per- 
centage of pollen is impotent, but the size of the apparently good 
grains ranges quite as for the first form. - 
No. 13 (figs. 13, 14)..-The stamens produced by this plant 
are somewhat smaller than those of the first form. They are 
slightly greenish-yellow, but are fully dehiscent. A large propor- 
tion of pollen was impotent, but a few well formed grains as large 
as the largest of the first form were found. Tests of pollen germi- 
nation in 15-1, 15~3, and 15-5 sugar-agar media gave germination 
in about 3 per cent of the grains. The tubes made a feeble growth 
and the longest obtained measured only 0.08 mm. 
No. 15 (figs. 15, 17).—Pistils of this plant are normally longer 
than the stamens when both are fully developed. The filaments 
are only slightly shorter-than in the first form; the anthers are 
decidedly smaller, but all are white and fully dehiscent. A large 
proportion of the pollen is impotent, but normal grains of large 
size are abundant. ‘The pistils produced by this plant were among 
the longest observed on any ‘plant, except for the abnormally 
elongated pistils (fig. 56) which appear in plants under certain 
conditions. 
No. 18 (figs. 18, 19)—The stamens and pistils in flowers of 
this plant are of nearly equal length. Nearly half of the apical 
portion of the stamens is composed of a sterile blade. The small 
anther sacs, however, are well developed and fully dehiscent. 
Scarcely a shriveled pollen grain was found, the grains being 
very uniformly of large size and a high percentage of them being 
viable. In this plant the amount of sterile tissue in stamens is 
decidedly more than that seen in nos. 1, 11-17, but there is better 
development of such sporogenous tissue as is formed. 
No. 20 (figs. 20-22, 54).—At the time when the pistils were 
receptive the flowers of this plant appeared as shown in fig. 20, 
