134 BOTANICAL GAZETTE [AUGUST 
the lozenge is formed by the infolded edges of the floral envelopes, 
while the central projecting “button” is produced by the pro- 
trusion of the anther tips. In the so-called Stenospermation the 
lozenge is merely the smooth upper surface of the thick-walled 
carpel, and there are no floral envelopes and no stamens surrounding 
the carpel. The “button” is the projecting stigmatic area (fig. 29). 
In the cavity of the carpel are found a circle of 4-8 erect anatropous 
ovules. Owing to the hardening of the gum contained in the tissues 
of this plant (and which resisted all reagents), sections could not 
be cut in paraffin, and the internal structure of the ovule cannot 
be described. Rather thick sections of the carpel were cut in 
celloidin, showing details of the stylar canal, and the curious 
crowded conducting cells as figured. 
While all the blossoms are alike so far as outward appearance 
is concerned, a certain number of them (about 40-50 per cent) 
are found to bear stamens in place of the ovules just described. 
They are arranged in a circle, similar to the arrangement of the 
ovules, have large, well developed anthers with a broad connective, 
and when examined appeared about ready for dehiscence. The 
filaments of course are extremely short. If they lengthen later, 
no suggestion of such lengthening appeared in the material under 
examination. The exterior appearance of the “ovary,” if such it 
may be called, is exactly the same whether it contains ovules or 
stamens. When torn open and mounted in glycerin, the anthers 
were seen to be filled with matured and normally formed pollen 
grains. No extra-carpellary stamens were found. The staminate 
carpels (if such they may be called) were found mixed among the 
Pistillate, but somewhat more numerous toward the upper end of 
the spadix. In‘a very few cases the same carpel was found to house 
_ both stamens and ovules. 
Io. Arisaema triphyllum 
The embryogeny of this species has been already discussed.’ 
F or the Investigation of the microsporangium bulbs were collected 
in September and the blossoms dissected out. It was found that 
fi * Gow, James Exurs, Embryogeny of Arisaema triphyllum. Bor. Gaz. 45:38-44- 
ee 24- 1908; also Mortier, Davy M., On the development of the embryo sac of 
risaema triphyllum. Bor. Gaz. 17:3 258-260. pl. 18. 1892. 
