(A) Heart-leaved Twayblade ( Listera cordata ) be¬ 
longs to a genus containing five species. 
Like most of the Orchids, they are largely or wholly 
dependent upon insect aid for fertilization. The weight, 
or shock, of an alighting insect on the broad lip causes 
a small gland within the flower to rupture and cover 
the pollen, just below, with a sticky fluid that causes 
it to adhere to the head or body of the insect and thus 
be transferred to the next flower. 
The stem of this species is from 3 to 10 in. high. At 
the top is a few flowered raceme; the sepals and petals 
are similar and spreading; the lip is drooping, longer, 
two-cleft and madder-purple in color. This species flow¬ 
ers during June and July in swampy woods from N. J. 
to Colo, and northwards to the Arctic coast. 
(B) Twayblade (Liparis lilifolia ), although having 
the same common name, is of a different genus. It is 
a more attractive plant, having two broad basal leaves 
and larger flowers with a broad ovate lip. It grows in 
woodland from Me. to Minn, and southwards. 
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