106 American Midland Naturalist Monograph No. 7 



1. Decumbent shrubs, rooting at the nodes: woods, local. Trailing 

 Strawberry-bush E. obovatus Nutt. 



2. Celastrus L. 



1. Leaves ovate-oblong, serrulate, pointed; rich soil, common. May- 

 June. Climbing Bittersweet C. scandens L. 



1. Leaves suborbicular, crenate, obtuse; introd. from Asia; occa- 

 sional at edge of woods, or along roads. White Bittersweet 



C. orbiculatus Thunb. 



45. Sapindaceae Juss. — Soapberry Family 



1. Cardiospermum L. — Balloon-vine 

 C. halicacabum L. Native of the tropics, sometimes cultivated for 

 ornament; occasionally escaping, but seldom persisting; Jackson, Ran- 

 dolph, and St. Clair counties. 



46. Staphyleaceae (DC.) Lindl. — Bladdernut Family 



1 . Staphylea L. — American Bladdernut 

 S. trifolia L. Moist woods and thickets, common. Apr. -May. 



47. Hippocastanaceae T. & G. — Horse-chestnut Family 



1. Aesculus L. — Horse-chestnut 



1. Winter-buds sticky; leaflets usually 7; petals 5, white, blotched 



with red and yellow; stamens exserted; calyx 6-9 mm long, 



puberulent ; fruit echinate ; large tree, frequent in cult., but 



rarely wild and not established; native of Greece. May- June. 



Horse-chestnut A. hippocastaniun L. 



1. Winter-buds not sticky; leaflets usually 5; small trees, native. 

 2. Flowers yellowish, 12-18 mm long; petals villous at the margin; 

 stamens conspicuously exserted; calyx campanulate, 5-6 mm 

 long; fruit echinate; woods, locally throughout 111. except the 



northern counties. Apr. -May. Ohio Buckeye A. glabra L. 



2. Flowers 3-4 cm long, mostly red but some red and yellow; 

 margin of petals glandular; stamens only slightly exserted; 

 calyx tubular, 12-16 mm long; fruit smooth; woods, s. 111. 

 Apr. Red Buckeye. [A. octandra of auth., not Marsh.; A. 

 pavia of auth., not L.] A. discolor Pursh 



48. Aquifoliaceae Lindl. — Holly Family 



1. Ilex L. — Holly 

 1. Leaves obovate, rounded at the apex, crenate; calyx-lobes not 

 ciliate; nutlets ribbed; woods, blufTs, edges of ponds and 

 swamps; in the counties bordering the Mississippi, Wabash, 



and Ohio rivers. April-May. Possumhaw. Swamp Holly 



/. decidua Walt. 



