WEATHERWAX: SPIKELETS OF ZEA MAYS 495 
advanced than that of the pistil; but the pistil of the upper flower 
_ of a spikelet is usually more advanced than the stamens of the 
lower flower. 
In the organs in which it occurs, suppression begins at about 
the time of the differentiation of the spore mother cells in the 
functional organs. 
The aborted stamen of the functional female Bier produces 
microspore mother cells before it begins to decline, and the aborted 
pistil of the male flower may produce a megaspore mother cell, 
but the organs of the aborted flower of the female — do not 
produce spore mother cells. 
REFERENCES 
. Blaringhem, L. Production d’une espéce élémentaire nouvelle de 
mais par traumatismes. Compt. Rend. 143: 245-247. 1906. 
. Golinski, St. J. Ein Beitrag zur Entwicklungsgeschichte des An- 
Lal 
2 
droeceums und Gynaeceums der Graser. Bot. Centralbl. 55: 1-17, 
65-72, 129-135. pl. 1-3. 1893. 
3. Guignard, L. La double fécondation dans le mais. Jour. de Bot. 
15: 37-50. 1901. 
4. Kuwada, Y. Maiosis in the pollen Bait cells of Zea Mays L. 
Bot. Mag. (Tokyo). 25: 163-181. pl. 5. 1911. 
5. Ueber die Chromosomenzahl vor Zea Mays L. Bot. Mag, 
(Tokyo). 29: 83-89. pl. 5. I915. 
6. Poindexter, C. C. The development of the spikelet and grain of 
corn. Ohio Nat. 4: 3-9. f.I-II. 1903. 
. True, R. H.. On the development of the caryopsis. Bot. Gaz. 18: 
212-226. pl. 24-26. 1893. 
eatherwax, P. Morphology of the flowers of Zea Mays. Buii. 
Torrey Club 43: 127-144. l. 5, 6+ f.1-4. 1916. 
“J 
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