188 M. C. Slopes. 
inch or two of mud, but were green and healthy in appearance, and 
sprouting new fronds. They differed from the water-grown fronds 
in being somewhat fleshier, in appearing not to mind which way up 
they grew, and in having quite undeveloped roots. 1 kept this form 
in the laboratory for more than two months under similar conditions, 
but when they were placed in water they grew half-an-inch of root 
in four days. 
These plants continued here till mid-summer, 1902, thus with¬ 
standing a period of dryness lasting nearly two years. 
The growth of semi-aquatics was, on the whole, what one would 
expect, different plants dominating locally. They seemed to prefer 
the more exposed and lighter portions of the stream, while the 
sheltered spots were selected by land plants, specially Uvtica. The 
total number of semi-aquatics that took any considerable hold was 
twenty, of which eight were locally dominant. 
SEMI-AOUATICS. 
rV 
Few. Frequent. 
Scattered. Dominant locally. 
Caltha palustns. Alisma plantago. Carex paludosa. 
Carex Jiirta. Carex riparia. Epilobium hirsutiim, 
Eupatoviumcannabinum. Digraph is arundinacea. Clyceria aquatica. 
jftLncus articulatus. Iris Pseud-acorus. Helosciadium nodi- 
jf. obtusiflorus. funcus communis. fiorum. 
Ranunculus sceleratus. Myosotis palustris. 
Rumex hydrolapathum. Nasturtium officinale. 
Sparganium ramosum. Phragmites communis 
Scrophularia aquatica. Salix sp. / 
Typha latifolia. 
Veronica Anagallis. 
V. Beccabunga. 
Total frequent— twenty, of which eight were locally dominant. 
The dry conditions did not seem to affect seriously the growth 
of these plants, and a few of them, e.g. Alisma and Myosotis grew 
in far greater quantity than in any previous year. Spiraea ulmaria , 
although growing in great numbers on the bank, did not invade the 
stream at all. 
All the plants flowered late, some not beginning to flower till 
September, but this was probably because very few had really a fair 
start till July. 
Many of the plants were growing so as to shew that they had 
been distributed by the agency of the dwindling stream, the young 
plants only appearing down-stream in relation to the parents. 
