436 BOTANICAL GAZETTE [may 



extreme growth of the suspensor. The micropylar end of the sac 

 disintegrates. 



4. Two haustoria are formed, the micropylar by the growth of 

 endosperm cells from the chalazal end into the micropylar end, and 

 the chalazal by a growth of endosperm cells from the chalazal end 

 out into the vascular system. The cells of the latter haustorium are 

 binucleate. 



5. False polyembryony occurs rather commonly in this species. 



Purdue Agricultural Experiment Station 

 Lafayette, Ind. 



LITERATURE CITED 



1. Bachmann, E. Th., Darstellung der Entwicklungsgeschichte und der 

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 ph. 1-4. 1888. 



2. BalickaTwanowska, G., Contribution a I'etude du sac embryonnaire 

 chez certaines Gamopetales. Flora 86:47-71. pis. 3-8. 1899. 



3. Chatin, J., Etudes sur la developpement de I'ovule et de la graine. Ann. 

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4. Coulter, J. M., and Chamberlain, C. J., Morphology of angiosperms. 

 New York. 1903. 



5. Deecke, Th., Nouvelles recherches sur la developpement du Pedicularis 

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6. D'HuBERT, M. E., Recherches sur le sac embryonnaire des plantes grasses. 

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7. Hegelmaier, Fr., tJber den Keimsack einiger Compositen dessen Umhul- 

 lung. Bot. Zeit. 47:805-812, 821-826, 837-842. 1889. 



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9. , Neuere Beobachtungen iiber die Embryobildung der Phanero- 



gamen. Pringsh. Jahrb. 1:1858. 



•10. Mitchell, Margaret, Embryo sac and embryo of Striga lutea. Bot. 

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11. Schacht, H., Sur I'origine de I'embryon vegetale. Ann. Sci. Nat. Bot. 

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12. ScHMiD, E., Beitrage zur Entwicklungsgeschichte der Scrophulariaceen. 

 Zurich. 1906. 



13. Sharp, L. W., The embryo sac of Physostegia. Bot. Gaz. 52:218-223. 

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