FAMILIES OF PLANTS 
43 
made up of a single stamen and a £tyle united together. The ovary is 
below the other parts of the flower. The pollen is in the form of 
two pear-shaped masses which are attached by stalks to a sticky 
disk and the whole structure usually adheres to the head or body of 
an insect when the flower is visited for nectar. 
1. Plants without green leaves. Coralroot ( Corallorhiza) _(p. 44) 
1. Plants with 1 green leaf. 2. 
1. Plants with more than 1 green leaf. B. 
2. Flowers rose color. Calypso ( Calypso bulbosa) ____(p, 43) 
2. Flowers greenish yellow. One-leaf-bog orchid ( Lysiella obtusata) _(p. 44) 
3. Leaves opposite. Ophyrs ( Listera )_„----—_(p. 44) 
3. Leaves alternate. 4. 
4. Spike of flowers spirally twisted. Ladiestresses ( Spiranthes stricta) _ (p. 44) 
4. Spike of flowers not spirally twisted. Limnorchis ______(p. 43) 
Figure 27.—Calypso. Rose. Photograph by A. R. Sweetser. 
Calypso (Calypso bulbosa) is a low plant with a single, broad, thin 
leaf at the base of a stem that is 2 to 5 inches high and bears 
2 or 3 brownish-green sheaths and a fragrant, showy, drooping 
flower. The sepals and petals are light rose color except the lip, 
which is a little longer and brownish pink spotted with purple. Usu¬ 
ally found in moist or boggy woods. 
Limnorchis .—Plants with fleshy roots, alternate leaves and small 
greenish or white flowers in spikes. The three species are rather 
difficult to distinguish but can usually be separated by means of the 
following key: 
1. Flowers white. White hog-orchid. {Limnorchis borealis.) 
1. Flowers greenish. 2. 
2. Spur equal to the lip. Northern green orchid. (Limnorchis viridiflora ). 
2. Spur longer than the lip. Limnorchis sparsiflora. 
