468 STEVENS: ENDOSPERM IN VACCINIUM CORYMBOSA 
represents a still further variation and suggests the desirability 
of a careful study of the development of the endosperm in other 
genera of this family. The writer has, however, been able to 
examine only one. Slides of Kalmia latifolia made from material 
collected at Vienna, Virginia, on May 28, 1916, showed embryo 
sacs before division and in the two-celled and four-celled stages. 
Material collected August 13, 1916, showed the endosperm with 
haustoria at either end, the whole condition very closely re- 
sembling that described in Epigaea. 
The significance of the condition described in Vaccinium 
corymbosum lies of course in the fact that here occur in a single 
species types of development hitherto associated with different 
genera or even different families. All the figures were drawn from 
material collected from a single plant and Fics. 2 and 3 represent 
ovules in the same ovary. Examination of a large amount of 
material of the other genera described might result in finding 
variations as marked as those in the Vaccinium. 
BUREAU OF PLANT INDUSTRY 
WASHINGTON, D. C 
LITERATURE CITED 
. Coulter, J. M., & Chamberlain, C. J. Morphology of angiosperms. 
New York. 1903. 
_ 
2. Hofmeister, Wilhelm. Die Entstehung des Embryo der Phanero- 
gamen. Leipzig. 18409. 
—_—— Neuere Beobachtungen iiber Embryobildung der 
Phanerogamen. Jahrb. Wiss. Bot. 1: 82-188. pl. 7-10. 1858. 
4. Koch, Ludwig. Die Entwicklung des Samens von Monotropa 
Hypopitys L. Jahrb. Wiss. Bot. 13: 202-252. 1882. 
5. Stevens, Neil E. Dioecism in the trailing arbutus, with notes on 
the morphology ‘of the seed. Bull. Torrey Club 38: 531-543- 
j. 24. > WOU. 

