ORCHIS FAMILY 147 
Flowers with two fertile anthers resting each on a lateral 
projection from the common column, the odd, center sta- 
men (which answers to the fertile stamen of other orchids) 
spread into a petal-like expansion . . . . Cypripedium 
Lip extended into a spur. 
Flower with one fertile stamen. Pollen in masses drawn 
out and forming a little stalk (caudicle) which is con- 
nected with a glutinous adhesive substance known as 
a “ gland.” 
The glands enclosed in a hood or pouch which opens 
diethe moth ofthe spur, + 447) 2-3) a Orehis 
Glands not enclosed in a pouch . . . Habenaria 
Pollen masses waxy, terminal to the column. Slender 
herb arising from a solid bulb. Spur slender, 2 or 3 
times as long as the flower. Flowers greenish in a 
loose lengthened cluster . . . . . .  Tipularia 
Lip not extended into a spur. 
Pollen masses not drawn out to form the little stalk, 
grains more or less powdery, but cohering in 4 or 5 deli- 
cate masses and attached to the summit of the anther. 
Leaves 2, opposite. The pair of green leaves near 
middle of stem. Lip of flower split . . Listera 
The pair of shining leaves near the base of the 
stem. Sepals and petals linear . Liparis 
Leaves along the stem, mostly below. Flowers 
in twisted spikes ... . . . . Spiranthes 
Leaves in rosette at base of stem, often blotched 
with white, not reticulated; lip entire, round- 
TSE ee ve wees, Pon Ot... 8) ee RIDA ets 
Stem very leafy, flowers in a long slender clus- 
ter; anther? hooded) * <5. 29=3;) =. 2 -Serapias 
Leaves mostly reduced to sheaths; flower soli- 
LALY 9), (DUUPIC 4c) Saracen ee Li) aidphl) Arethusa 
Leaves broad grass-like; flowers several in a 
loose cluster, pink purple. Lip crested with 
long yellow hairs : Calopogon 
Flowers few or solitary. Leaves few, alternate 
or in a whorl. Anther attached to the back 
Ob the column.» o 9, «2 .« «2, «, « @Pogonia 
