Ii8 BOTANICAL GAZETTE [august 



with the lobes of the corolla scarcely expanding and the large 

 anthers scarcely protruding. Several days later, when the stig- 

 mas were beginning to shrivel, the corolla was slightly expanded 

 (fig. 2i). The anthers are large, but there is marked inequality 

 in size of the 2 pairs. The pair next to the insertion of the fila- 

 ment is uniformly the larger and overlaps somewhat the smaller 

 pair, so that in face view an anther appears as in fig. 22. De- 

 hiscence is somewhat irregular and is confined to the apex, so that 

 few spores are shed. The anthers persist until all the flowers 

 in a spike bloom. In old anthers the microspores are dry and 

 shriveled, but in fresh anthers they are mostly of large size and 

 appear to be normal; but no germination was obtained in cul- 

 tures. 



No. 23 (figs. 23, 24). — A plant with short crinkled filaments 

 and extremely narrow and pale green anthers. Most anthers 

 dehisce fully. Very few microspores are plump and have gran- 

 ular contents. The range of size of grains is quite as for the 

 first form, but no germination was obtained in cultures. 



No. 25 (figs. 25-27). — This plant resembles a second form her- 

 maphrodite. The stamens, however, are decidedly shorter, the 

 anthers are somewhat of the same shape but dehisce regularly, 

 and the microspores range to a larger size quite as for the first 

 form. About 20 per cent of the pollen grains tested germinated, 

 but in all cases the tubes made only a very feeble growth. 



No. 28 (figs. 28, 29). — The stamens produced by this plant 

 have short and crinkled filaments with decidedly green anthers. 

 The apical half of the anthers is composed of a sterile green blade, 

 and the anther sacs are much reduced in size and are not de- 

 hiscent. At least 75 per cent of the pollen grains that are produced 

 are of large size and are plump with granular contents. In 3 

 cultures of pollen removed from fully developed anthers 6 grains 

 germinated and the best developed tube was 0.60 mm. in length. 



No. 30 (figs. 30, 31). — In general appearance the stamens 

 produced by this plant resemble those of the second form; the 

 anthers are greenish yellow but the filaments are shorter. There 

 is a marked peculiarity, however, in the development of anther 

 sacs not observed thus far on any other plant. When anthers 



