94 
Dicotyledons with Incomplete Flowers. 
Natural Order 
U LMACEJE. Tab. 77. 
Diagnosis. —Trees with watery sap and alternate distichous, penniveined, 
stipulate leaves. Flowers hermaphrodite or polygamous, with a bell-shaped 
perianth. Ovary free. Fruit dry and winged in the British species. 
Distribution. —A very small Natural Order of the North Temperate zone, common to both the 
New and Old World. 
One British Genus ; Species, 2. 
Fruit in Elm ( Ulrrms) with a membranous wing (samaroid); in Planer-tree ( Planerci ) a coriaceous nut. 
USES, &c. — The Elms ( TJlmus campestris and U. montana , the latter the Wych Elm) are noble and picturesque 
timber trees ; common Elm often attaining 100 ft. or more in height. The wood is especially suited for works which 
are constantly under water, and that of knotted or pollard trees, owing to its hardness and intricate veining, is valued 
by cabinet-makers for ornamental work. The bark of some species, especially of the American Slippery Elm 
([Ulmus fulvd), contains a very copious and wholesome mucilage. 
Natural Order 
PLATANACEJE. Tab. 78. 
Diagnosis. —Trees with watery sap and alternate palmatifid, stipulate, 
deciduous leaves. Flowers naked, monoecious, in globose unisexual heads. 
Ovary 1-celled, with 1 pendulous ovule. 
