MAY. 171 
a distance it has the appearance of a dead flower; but on 
examination it is found to be very beautiful and delicate in 
all its parts. The stem is about a foot high, having no 
leaves but shining scales. These two species are usually 
found together in shady woods in many parts of England. 
I have seen it in profusion on the South Downs. 
Listera corpata. LHeart-leaved Twayblade. <A less 
common species, found in most shady woods in the north of 
England ; it is much smaller than the ovata, though not 
unlike it in other respects. The flowers are green, and 
conspicuous. ‘These three form the genus. 
Monecia. TRIANDRIA. 
GLUMACEX. CYPERACES. 
CAREX. (SEpGE.) 
This genus contains sixty-three species ; and as very many 
difficulties arise in its study I shall not introduce it to the 
notice of young students, but refer them, when they wish 
for information on this extensive genus, to a good botanist 
for instruction, or to good plates on the subject. The 
plants are very like the grass tribe, but easily distinguished 
