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TABLE OF GENEHA. 
xlv 
. Parietarta. Flowers in axillary clusters, surrounded by an involucrum. 
. Humulus. A climber. Dioecious. Fertile flowers in an oval catkin. 
Order LXXX. TJLMACEiE. 
1. Ulmcs. The only British genus. 
Order LXXXI. ELEAGNACEiE. 
1. Hippo piiaE. The only British genus. 
Order LXXXII. MYRICACE.E. 
1. Myrica. The only British genus. 
Order LXXXIII. BETULACE^E. 
1. Betula. Stamens 8-12. 
2. Alnus. Stamens 4. 
Order LXXXIY. S ABIC ACE.E. 
1. Salix. Scales of catkins entire. Stamens 1-5. 
2. Populus. Scales jagged. Stamens 4-30. 
Order LXXXY. CUPULIFER.E. 
1. Fagus. Barren flowers in a globular catkin. Fertile flowers within a prickly 
involucrum. Stigmas 3. 
2. Castanea. Barren flowers in a cylindrical catkin. Fertile flowers in a 4-lobed 
involucrum. Stigmas 6. 
3. Quercus. Barren catkin lax, long. If ut surrounded by the cup-like involucrum. 
4. Corylus. Barren catkin long, cylindrical. Nut covered by a coriaceous in¬ 
volucrum. 
5. Carpinus. Barren catkin long, lax. Involucrum of 2 leaf-like scales. 
Order LXXXYI. CONIFERiE. 
1. Pinus. A tree. Fertile flowers in a cone. 
2. Juniperus. A bush. Fruit berry-like. 
3. Taxus. A tree. Seed enveloped in a cup-like fleshy receptacla 
Order LXXXYII. DIOSCOREACE.E, 
1. Tamus. The only British genus. 
Order LXXXYIII. TRILLIACEiE. 
1. Paris. The only British genus. 
Order LXXXTX . HYDROCHARIDACE^E. 
1. Anacharis. Leaves whorled. Plant submersed. 
2. Hydrocharis. Leaves floating, kidney-shaped. 
3. Stratiotes. Leaves submerged, sword-shaped, with marginal prickles. 
Order XC. ORCHIDACE^E. 
* Anther cohering to the face of the stigma. 
1. Orchis. Lip with a spur. Glands of the stalks of tliepollcn-masscs in a pouch 
