156 ORCHIDACEJE. 



B. Ovary superior. 



1. Flowers mostly perfect. Perianth regular. 



Ord. 79. TRILLIACE.E. Leaves reticulate, not articulated with 

 the stem. Perianth of 8 segments, in 2 rows. Filament extend- 

 ing beyond the anther. 



Ord. 80. LILIACE^:. Perianth of 6 segments, petal-like, usually 

 highly-coloured. Stamens 6. Anthers opening inwards. Ovary 

 3-celled. 



Ord. 81. JUNCACE^. Perianth of 6 segments, stiff, glume-like, 

 or coloured internally and herbaceous. Stigmas 1 3. Ovary 

 1 3-celled. 



Ord. 82. A LISMACE.E. Perianth of 6 segments, the inner 3 

 often petal-like. Stamens 6 9, or more. Ovaries 36, or of 

 numerous achenes. 



2. Flowers mostly imperfect. Perianth seldom present. 



Ord. 83. TYPHACE^S. Monoecious. Flowers in dense heads or 

 spikes. Spatha none. Perianth ? of 3 scales or hairs. Stamens 

 1 6. Ovary solitary, 1 -celled. Leaves rigid, sword-shaped. 



Ord. 84. ARACE^E. Flowers arranged upon a spadix, either 

 enclosed in a convolute spatha, or flat and continuous with the 

 scape. 



Ord. 85. LEMNACE^E. Leaves or fronds floating on the surface 

 of the water. Stemless. Flowers on a spadix, surrounded by a 

 spatha, springing from below the edge of the fronds. 



Ord. 86. NAIAD ACE^E. Submerged or floating plants. Flowers 

 in a loose spike or spadix. Perianth scale-like, or none. St. 1 4. 

 Ovaries 14. Ovules usually solitary. Leaves very cellular. 



GENERA OP PETALOIDE.3E. 



OED. 75. HYDKOCHARIDACE^E. 



1. ANACHARIS. Leaves verticillate. "St. 9." Fertile flower, 

 with a long filiform tube. Stigmas 3. 



ORD. 76. ORCHIDACE.E. 



1. MALAXIS. Sepals broad, widely spreading. Lip very small, 



without a spur. Pollen masses in 2 pairs, connected at their 

 apex. Germen twisted. 



2. EPIPACTIS. Perianth spreading. Petals shorter than the 



sepals. Lip. free from the column, contracted in the middle, 

 the terminal portion broad and petal-like. Germen straight, 

 pedicel twisted. 



