294 
SVEDELIUS : LIFE-HISTORY OF 
4. The wing-like female spathe leaves aid to keep the 
female flower floating in a horizontal position. 
5. The petals are specially adapted to catch the floating 
male flowers. 
6. The exposure of the female flowers and the loosening 
of the male flowers only occur during low water. 
7. During high water the position of the female flower 
is changed from horizontal to vertical. The heavy, sinking 
pollen grains can scarcely avoid sinking down upon the 
erected stigmas, which form a striking “ appareil collecteur.” 
8. Enalus thus as regards pollination takes an intermediate 
place between the epihydrogamic and the hypohydrogamic 
hydrophilous plants. 
9. The ovules when young are enclosed in mucilage 
developed from the inner walls of the ovarial cavities. At 
the maturity of the fruit the mucilage is nearly all gone. 
10. The suspensor-cell is very large. The embryo- 
development is of the common monocotyledonous type. 
31. The integuments are never lignified. At maturity 
the testa is only an easily loosened cap around the embryo. 
12. Thus Enalus disperses the embryos directly, or has 
no seeds. These embryos develop immediately. 
Botanical Institute, 
University of Upsala (Sweden), April, 1904. 
Literature, 
1. Arnoldi .—Ueber die Ursachen der Knospenlage der Blätter. 
Flora, 1900. 
2. P. Ascherson .—Vorarbeiten zu einer Uebersicht der phaneroga- 
men Meergewächse. Linnæa, XXXV. Berlin, 1867-68, p. 152. 
3. - Federico Delpino’s Eintheilung der Pflanzen nach dem 
Mechanismus der dichogamischen Befruchtung und Bemerkungen 
über die Befruchtungs-Vorgänge bei Wasserpflanzen. Bot. Zeitung, 
XXIX. Leipzig, 1871. 
