64 DICOTYLEDONOUS PLANTS. 



flowers on long slender peduncles, corymbed ; fruit glabrous, turgid 

 at base ; wings diverging. 



HAB. Mountainous situations. Ver. to Car. April. A large 

 tree. Flmrcrs yellowish. Petioles pubescent. 



Black Sugar Maple. 



* Flowers in racemes. 



6. A. striatum Mich. : leaves with 3 acuminate lobes, rounded at the 

 base, acutely dentate, smooth ; racemes simple pendulous ; petals oval : 

 ffit smooth ; wings somewhat diverging. A. pennsylvanicum Lam. 



HAB. Shady rocks. N. S. May. >>. Shrub 10 or 12 feet 

 high ; trunk beautifully striate. Leaves rarely undivided. Flowers 

 greenish-yellow, 10 12 in a raceme. 



Striped Maple. Moose Wood. 



7. A. spicatitm Linn. : leaves small, 3 5-lobed, acute, dentate, cor- 

 date, pubescent beneath ; racemes spikeform, erect ; petals linear ; 

 fruit smooth ; wings somewhat diverging. A. montanum Ait. Pursh. 

 Torr. 



HAB. On mountains. Can. to Geor. May. Shrub 810 feet 

 high. Flmccrs greenish, small. 



2. NEGUNDO. DC Cand. 



Flowers dioecious. Calyx minute, unequally 4 5-toothed. 

 Petals none. Anthers 4 5, linear, sessile. 



Octandria. Monogynia. 



N. fraxinifolium Nutt. : leaves ternate and pinnate ; leafets unequal- 

 ly and coarsely dentate ; odd one often 3-lobed ; flowers in simple 

 pendulous racemes. Acer negundo Linn. Mich. 



HAB. River banks. Penn. to Geor. W. to Rocky Moun. April. 

 A large tree with greenish flowers. 



Ash-leared Maple. Box Elder. 



ORDER XXV. HIPPOCASTANE^E. De Cand. Lind. 



Calyx campanulate, 5-lobed, Petals 5, or 4 by the abor- 

 tion of one of them, unequal, hypogynous. Stamens 7 8, 

 distinct, unequal, inserted upon a hypogynous disk ; anthers 

 somewhat incumbent. Ovary roundish, 3-cornered, 3-celled ; 

 style 1, filiform, conical, acute ; ovules 2 in each cell. Fruit 

 coriaceous, 1 2 or 3-valved, 12 or 3-celled, 1, 2 or 3-seed- 

 ed. Seeds large, roundish, with a smooth shining coat, and 

 a broad pale hilum ; albumen none ; embryo curved, inverted, 

 with fleshy, very thick, gibbous, cohering cotyledons, germinat- 

 ing under ground ; plmnula unusually large, 2-leaved ; radicle 

 conical, curved, turned towards the hilum. 



