HYDROCHARIDEjE ORCHIDEiE. 
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nent spirally twisted cells. — Ponds and ditches. P. VII. VIII. 
Frog-bit. 
2. Stratiotes Linn. 
1 . S. aloides (L.) ; 1. swordshaped-triangular ciliate-spinous. 
— E. B. 379. — Root creeping extensively in the mud and sending 
up numerous rigid leaves like those of an aloe. Stalk compressed, 
5 or 6 in. high with 2 1. near its summit. Fl. white, delicate. 
The plant rises to the surface of the water to flower and sinks 
again afterwards. — Ditches in the east of England ; naturalized 
in Scotland. P. VII. Water Soldier, E. 
Order LXXVIII. ORCHIDEiE. 
Sep. 3, usually coloured. Pet. 3, 2 above, 1 below (lip) fre- 
quently lobed and spurred and unlike the others. Stam. 3, united 
in a central column, 2 lateral abortive, or (in Cypripedinm) the 
middle one abortive. Pollen powdery or adhering in masses. 
Ovary 1 -celled, inferior, with 3 parietal placentas. Style form- 
ing part of the column with the stam. ; stigma a viscid space in 
front of the column. Caps. 3-valved. Seeds very numerous, 
minute. Testa loose, reticulated. 
Tribe I. OPHR YDINEM. Pollen-masses in divisible lobes 
which are indefinite in number and waxy. Anthers wholly 
adnate. 
* Cells of the anther with a rostellate process between their bases. 
1. Orchis. Perianth ringent, hooded. Lip 3-lobed, spurred. 
Glands of the stalks of the pollen-masses in a common pouch. 
2. Gymnadenia. Glands of the pollen-masses without a 
pouch. Otherwise like Orchis. 
3. Aceras. Lip without a spur. Otherwise like Orchis. 
** Cells of the anther without any process between their bases. 
4. Habenaria. Perianth ringent, hooded. Lip 3-lobed or 
entire, spurred. Glands of the stalks of the pollen-masses 
exserted, naked. 
5. Ophrys. Perianth patent. Lip variously lobed, without 
a spur. Glands of the stalks of the pollen-masses each in 
a distinct pouch. 
6. Herminium. Perianth bellshaped, segments all erect. 
Lip 3-lobed, tumid beneath at the base, without a spur. 
Glands of the stalks of the pollen-masses exserted, naked. 
