TABLE OF GENERA. 
xlvii 
Order XCIY. MELANTHACEvE. 
1. Colciitcum. Perianth funnel-shaped ; tube very long. 
2. Tofxeldia. Perianth 6-parted. Styles short. 
Order XCY. BESTIACEiE. 
1. Eriocaulon. The only British genus. 
Order XCVI. JUXCACE^E. 
1. Nartiiecium. Perianth yellow, petal-like. 
2. Juncus. Perianth scale-like. Capsule 3-celled. 
3. Luzula. Perianth scale-like. Capsule 1-celled. 
Order XCYII. BUTOMACEyE. 
1. Butomus. The only British genus. 
Order XCVIII. ALISMACE.E. 
1. Actinocarpus. Stamens 6. Carpels 2-seeded. 
2. Ai.isma. Stamens 6. Carpels 1 -seeded. 
3. Sagittaria. Flowers monoecious. Stamens many. Leaves sagittate. 
Order XCIX. JUNCAGIXACEyE. 
1. Triglociiin. Ovary 1. 
2. Scueuciizeria. Ovaries 3. 
Order C. TYPHACEiE. 
1. Typiia. Flowers in a long spike (spadix). 
2. Sparganium. Flowers in globular heads. 
Order Cl. ABACEtE. 
1. Arum. The only British genus. 
Order CII. OBONTIACE.E. 
1 . Acorus. The only British genus. 
Order CIII. PISTIACEA3. 
1. Leiina. The only British genus. 
Order CIY. NAIADACEiE. 
1. Potamogeton. Perianth of 4 sepals. Carpels 4, sessile. 
2. Ruppia. Perianth wanting. Carpels 4, on long stalks. 
3. Zanniciiellta. Flowers axillary, in a membranous bract. 
4. Zosteua. Flowers in a slit in the grass-like leaf. 
Order CY. CYPEBACEiE. 
1. Cyperus. Spikelets many-flowered, 2-ranked, nearly all fertile. 
2. Schcenus. Spikelets 2-4-ilowered, 2-ranked. Lower glumes empty. S^yle 
deciduous. 
