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yledons). To the west of the brook are the families belong- 
ing to the exogenous division of plants, or those in which the 
leaves are usually net-veined and which have two seed- 
leaves (dicotyledons); this latter group embraces the 
larger part of the plants in the collection. Along the brook, 
or in it, may be found many aquatic plants, representing in 
some cases families which are exclusively water-lovers, 
while in other cases they are aquatic representatives of 
families occurring in the immediate vicinity in the beds. 
In this plantation, the family groups are arranged sub- 
stantially in a sequence beginning with those of simpler 
organization and proceeding to the most complex. 
The series commences in the southern corner of the valley 
at the foot-path entrance, where the hardy ferns and their 
allies may be found, including species from all parts of the 
north temperate zone. Among these may be mentioned the 
ostrich fern, the cinnamon fern, Clayton’s fern, the royal 
fern, the brake or bracken, and a number of species of the 
shield-ferns and of the spleen-worts. Some of the aquatic 
representatives of the ferns and their allies may be found 
in the pond nearby. 
In this pond may also be found the following aquatic 
endogenous families: the cat-tail family, the bur-reed family, 
the pond-weed family, the arrow-grass family, and the 
tape-grass family. At the junction of the brook with this 
pond is the water-plantain family, including, besides the 
water-plantain, several species of arrow-head (Sagittaria). 
A little beyond, in the brook, may be found the water- 
poppy family, represented by the water-poppy, a showy 
plant common in tropical regions. 
Following to the north comes the large group of the 
grasses and grass-like plants, those whose flowers, mostly 
very small, are subtended by chaffy scales or glumes. 
This is represented by the grasses and the sedges, several 
beds being devoted to each of these families. Some of the 
more familiar grasses are: timothy, Kentucky blue-grass, 
reed canary-grass, orchard grass, red-top and tall fescue- 
