316 



THE KINDS OP PLANTS 



leaves rather small, not deeply 3-5-lobed, whitish beneath, the lobes serrate 

 and toothed : fruit with nearly parallel or slightly spreading wings, not 

 downy. Low grounds. 



46G. Acer saccharum. 



bb. Flowers in clusters, with the leaves, some or all on shoots of 



the season. 



A. saccharum, Marsh. (A. saccharinum of some). Sugar, hard, or rock 

 maple. Figs. 129, 466. Flowers greenish, drooping, on long pedicels, the 

 petals none and the calyx hairy at the top : leaves 

 bright green, firm, cordate-orbicular in outline, 

 3-lobed and the side lobes again lobed, all lobes 

 and teeth ending in points, the basal sinus broad 

 and open: wings of fruit somewhat spreading. 

 Commonest of maples east. 



A. nigrum, Michx. Black sugar maple. 

 Fig. 467. Foliage dark and limp, the lobes broad and shallow, little toothed 

 and with only blunt points, the basal sinus nearly or quite closed : wings of 



fruit nearly parallel, large. Eastern Central 

 <?A States; by some regarded as a form of A. sac- 

 charum. 



A. platanoldes, Linn. Norway maple. Figs. 

 75, 76, 77, 144, 296-303. Flowers late, in umbel- 

 like clusters, yellowish green, large, with both 

 sepals and petals: leaves large and heavy, 3-5- 

 lobed and much toothed, all parts ending in points : fruit with wide-spread- 

 ing wings. Europe. Commonly planted: has milky juice and a round, 

 dense head. 



aa. Box-elder: leaves pinnate. 



A. Negundo, Linn. {Negundo aceroides, Moench). Box-elder. Tree 

 with green glaucous twigs and leaf-bases covering the buds : flowers in long 

 racemes, dioecious, with 4-5-cleft calyx and no corolla, and 4-5- stamens, the 

 sterile flowers on long, slender pedicels : leaves pinnate, with 3-5 ovate- 

 pointed toothed leaflets: fruit with somewhat incurving wings. Common: 

 much planted in cold and dry regions west. 



467. Acer nigrum. 



XVI. LEGUMTNOS.E. Pulse or Pea Family. 



Herbs, shrubs, or trees, mostly with pinnately compound alter- 

 nate leaves: flower papilionaceous in the species described below: 

 fruit typically a legume. A vast family and widely dispersed, with 

 many tropical species. Genera about 400, and species about 6,500. 

 By some authors, the species with papilionaceous flowers are separated 

 into the family Papilionacese, and those of the acacia tribes, with 

 regular flowers, as the Mirnosaceoe. Familiar leguminous plants are 

 pea, bean, lupine, clover, alfalfa, vetch, wistaria, locust, red-bud. 



