SAPINDACE^ 345 



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



the season. 

 A. slccharum, Marsh. (A. saccharintim of some). Sugar, hard, or rock 

 maple. Figs. 129, 4GG. 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-Iobed 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. ^^- ^"^"^ saccharum. 

 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 

 States; by some regarded as a form of ^. sac- 

 chartim. 



A. platanoides, 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. 



A. Psetido-Platanus, Linn. Si/cainore maple. Tree from Europe, and 

 many varieties cultivated: leaves broad, 3-7-lobed, glabrous above, whitish 

 and downy below: lobes acute, unequally toothed: racemes terminal, droop- 

 ing: flowers yellowish-green : ovaries woolly: fruit downy, the wings 

 rather spreading. 



bbb. Flowers appearing after the leaves, in racemes: large hushes or bush- 

 like small trees in cool woods and ravines. 

 a.. Pennsylvd,nicum. Linn. Striped maple. Moose-ivood. Bark smooth- 

 ish, light green, striped: flowers greenish, in terminal drooping loose 

 racemes: leaves simple, thin, 3-lobed near apex, the lobes acuminate, with 

 finely toothed margin all round: fruit greenish, smooth, with large, widely 

 diverging wings. Small tree. 



A. 8picS,tum, Lam. Mountain maple. Shrub, 5-10 ft., usually forming 

 clumps: bark green, not striped: flowers appearing after leaves, in dense 

 racemes, upright, compound, small, greenish, leaves slightly 3-5-lobed, 

 coarsely serrate: fruit with narrow, somewhat divergent wings. 

 aa. Box-elder; leaves pinnate. 

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

 with greeu glaucous twigs and leaf-bases covering the bubs: 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. 



