38 
submarginal prosenchymatous cells, and this is more or less evi- 
dent in all the specimens, even Scouler’s of S. aguatica, though 
much less prominent in the young green leaves from the apex ot 
the stems than in the older leaves, where they become different 
jated in color, showing as yellow streaks, irregularly between the 
vein and margin, but always near the margin. 
Another peculiar character, which has been mentioned in S 
patagonica, but not in any other species, is the development of 
filamentous radicles on the vein at base. Mitten described them 
« Nervo obscuro inferne dorso radicellis vestito.’ This character 
is very prominent in some of our specimens, and in fact is hardly 
absent from any of them, the whole lower surface of the vein in 
some leaves being densely covered with scattered or tufted, seem , 
ingly glandular hairs. The serrations of the margins too, are very 
variable, and of no value for distinguishing the species. The 
young green leaves. are always more sharply and _ irregularly set- 
rate, generally also at the apex, but the older leaves on the same 
stems, are often entire at apex, and indistinctly serrate below; I 
have even seen leaves quite entire, on the same plants. The teeth 
are often black and swollen, though this is never a constant chat- 
acter. : 
The cucullate apex, for which Mueller has named the var. caéil- 
liformis, is due to the bending of the vein a short distance below 
its apex. This too seems to be a character of the younger leaves. 
They also vary in being serrate on the back near the apex, and the 
_ vein is sometimes much thickened, and prolonged to the summit of 
the leaf, as figured by Schwaegrichen, instead of ending below the 
apex as it usually does. The color and size of the 3-4 rows of 
marginal cells of the leaves also varies, and in some leaves the 
green quadrate cells of the margins are so sharply differentiated 
from the elongated narrower submarginal ones, that they form am 
undulate border next to a deep yellow fold on each side. 
ScouULERIA AQUATICA Hook. Bot. Mise. 1: 33, ¢. 78 (1830). 
A portion of the type specimens collected by Scouler are in 
our possession, and the following description was drawn from 
them, giving measurements which Hooker did not give. 
Plants 5-6 cm. long, stems flexuose, sparingly branched ; lower 
. s 2 : leaves abraded, sede eaten lanceolate, 4 mm. lene by 1.5 mm. 
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