NO 
2 AMONG THE WILD FLOWERS. 
| 
It will be sufficient to mention AZyrz0phyllunz, 
the Water-Milfoil, submerged, and /7ppuzr7s, 
the Mare’s-tail, sending up its spikes above the 
water—both described in Paper XVII. 
Callitriche, the Water-starwort, is known by 
its fresh green rosettes of leaves crowded to- 
gether at or under the surface of ponds and 
slowly running water, with long white #/2/orm, 
thread-like, stems. It is a moncecious plant, 
flowers without perianth or corolla, male with 
one stamen and yellow anther on long filament, 
produced in the upper axils of the leaves; 
female flowers below, consisting of a green 
2-lobed ovary and two long styles. Mr. 
Babington distinguishes 4 species of this com- 
mon plant. 
In ponds and ditches will be observed masses 
of long slender stems, often without any flower 
discoverable, densely clothed with whorls of 
dark-green leaves, in the axils of which the 
flowers are found when produced. The male 
flowers have 12 to 20 sessile anthers. This 
is the Hornwort, Ceratophyllum; there are 
two species. Lemna, Duckweed, is another 
moncecious Aquatic, often covering over the 
stagnant pond with its green /rozds, as the 
