
64 PLANTS GROWING IN MUD. 
while apparently simple, is devised in the same profound man- 
ner that the family have chosen to aid them in securing the ser- 
vices of insects for cross-fertilization. In most orchids the 
perianth is in two sets, of three divisions each ; the outer set 
answers to sepals, and the inner set, to petals. ‘The sepals are 
highly coloured and harmonize with the petals. By a peculiar 
twist of the ovary, what would naturally be the upper petal is 
brought down and forms the lower one, or lip. It is the start- 
ling feature of the flower; and is rich in blandishments for 
Master Bee. In some varieties it appeals to his artistic sense 
by a delicate fringe, or a superb colour, and again it supplies 
him with a substantial meal of nectar. The internal structure 
consists of one stamen, formed like a column, and supported by 
the style or broad, glutinous stigma. In the cypripediums 
there are two stamens. Just above the stigma at either side 
are placed the two anther cells. Here the pollen grains are 
concentrated in little quantities, which are readily carried off by 
insects to other flowers. 
The divergent anther cells of H. grandiflora suggest the two 
eyes of a moth, or butterfly, whose appearance the flower has 
tried to imitate. 
SMALL PURPLE-FRINGED ORCHIS, (Plate XXV.) 
Habenarza psycodes. 
The small purple-fringed orchis is more faithful to the swamps 
than the larger one, which strays sometimes to the moist mea- 
dows. It comes into bloom a little later in the season, and is 
not so handsome a variety ; but it has a delicate perfume. 
FRINGELESS PURPLE ORCHIS., 
Flabenartia peramena, 
Another more severe type of a purple orchis, which rarely 
comes further north than Pennsylvania and New Jersey. Itis 
found in wet meadows, or seeking moisture by following the 
mountains. In size it is between that of the two preceding 

