70 sapindace^:. 



4. A. Pennsylvanicum, L. Striped Maple. 



Leaves with 3 acuminate lobes, rounded at base, finely and sharply double serrate; 

 racemes drooping, loose; petals obovate; fruit with large diverging wings. 



Ricb woods and shady rocks. May. A shrub or small tree 10 to 15 feet high. 

 Trunk beautifully striped lengthwise with green and black. Leaves rarely undi- 

 vided. Flowers large, yellowish-green, 10 to 12 in a raceme. Fruit clustered, with 

 pale-green wings. 



5. A. spicatum, Lam. Mountain Maple. 



Leaves small, 3 to 5 lobed, acute, dentate, pubescent beneath ; racemes erect, 

 dense, somewhat compound; petals linear; fruit smooth; wings somewhat diverg- 

 ing- 



Rocky hills and mountains. May, June. A shrub S to 12 feet high growing in 

 clumps. The bark is of a light gray color. Leaves somewhat pointed, with large 

 sharp teeth, more or less cordate at base. Flowers greenish, numerous and small, 

 in round, oblong, close-branched clusters 2 to 3 inches long, becoming pendulous 

 with the winged fruit. 



2. NEGUNDA. Moench. 



Calyx minute, 5-cleft. Petals none. Stamens mostly 

 5. — Small trees icith compound pinnately 3 to b-foliate leaves, 

 arid dicecious flowers, from lateral huds; the sterile in clusters 

 on capillary pedicels ; the fertile in drooping racemes. 



N. aceroides, Moench. Ash-leaved Maple. Box Elder. 



Leaves ternate, or pinnate by fives; leaflets' o\&te, acuminate, remctely and 

 unequally dentate: pistillate racemes long and pendulous; barren flowers corym* 

 Lose; fruit oblong, with large wings dilated upwards. 



River banks, low wet grounds and along mountain streams. April. A small 

 but handsome tree 10 to 20 feet high, with light-green twigs, and smooth yellowish- 

 green bark. Flowers yellowish-green, very delicate, in drooping clusters, rather 

 preceding the leaves. Fruit pubescent, oblong, the wings about an inch long. 



Order 33. SAPIWDACEiE. 



Trees, shrubs, or climbers furnished wilh tendrils, rarely herbs, with alternate and 

 mostly compound leaves, and small, unsymmetrical, usually irregidar and polygamous 

 flowers. Calyx of 4 or 5 sepals. Petals irregular and often one fewer than the 

 fiepals, sometimes wanting. Stamens 8 to 10. Ovart 2 to 3-celled, the styles or 

 stigmas more or less united. Seeds usually with an aril, destitute of albumen. 



1. CAKDIOSPERMUM. Linn. 



Qt. Jcardia, heart, spcrma, seed ; the globose seeds marked with a large cordatt 



hilum. 



Sepals 4, the 2 outer smallest. Petals 4, each with an 

 emarginate scale above the base, the 2 lower remote from 

 the stamens, their scales crested; glands of the disk 2, oppo- 

 site the lower petals . Stamens 8, unequal. Style trifid. 

 Capsule membraneous. — Climbing herbs } with liter&aU 



