1910] SMITH—ERIOCAULON 287 
and there is no trace of a suspensor. Later, however, after the posi- 
tion of the cotyledon is indicated, a short suspensor is developed 
through the activity of one of the basal cells. 
Experiments are now in progress to ascertain what changes the 
embryo of Eriocaulon undergoes in germination. 
Summary 
1. Eriocaulon gives evidence of derivation from a bisporangiate 
ancestor in that the pistillate and staminate flowers possess rudimen- 
tary stamens and pistil respectively. 
2. The flower is tetracyclic. 
3- The ovules are placed laterally upon the axis. 
4. Four megaspores are produced, the innermost of which is 
fertile, but the others in a large number of ovules begin i eeegi rs 
5. The embrya sac develops i in the usual way. 
6. “Double fertilization” occurs. 
7. The embryo has no suspensor; its first division wall is trans- 
verse; quadrant, octant, and periclinal divisions follow; and no 
embryonic organs are eae in the i seed. 
McMaster UNIVERSITY 
Toronto, CANADA 
LITERATURE CITED 
CaMPBELL, D. H., Studies on the Araceae. I. Annals of Botany 14:1-21. 
1900. 
lal 
, The embryo sac of puns Annals of Botany 15:103-118. 1901. 
, Studies on the Araceae. II. Annals of Botany 17:666-687. 1903. 
————, Studies on the eda Ill. Annals of Botany 19: 329-349. 1905. 
a 
odorata and Nymphaea advena. Bull. Torr. Bot. Club 29:211-220. 1902. 
6. Coutrer, J. M., anD CHampertatn, C. J., Morphology of angiosperms. 
3: 
7. Gow, J. E., Embryogeny of Arisaema. Bor. GazETTE 45:38-44 
8. HEGELMATER, W., Zur Entwickelungsgeschichte ropnocotyleiones "Keime. 
Bot. Zeit. 32: 681-686. 1874 
+ JouNson, D. S., On the pa of certain Piperaceae. Bot. GAZETTE 
34: 321-340. 1902. 
Kusano, S., Further studies on Aigenetia. Bull. Coll. Agric. Tokyo Imp. » 
Univ. 8:1. 1908; review in Bot. Centralb. 111: 244. 1908. 
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