76 Spring Flora of Ohio. 



Rhus rad'-i-cans L. (/?. toxicodendroti L.) Poison Ivy; Poison Oak. — 



Climbing by rootlets or sometimes low and erect; leaflets 3, variously 

 notched, sinuate or cut-lobed; poisonous. 



A. Flo7cers in solitary or clustered spikes or heads in early sprins;. 



Rhus ar-o-mat'-i-ca Ait. {R. canadensis Marsh.) Aromatic Sumach. — 

 A straggling bush, 3-7 ft. high ; leaflets 3, unequally cut-toothed. 



XIvVII. Order AOUI-FO-LI-A'-CE/E. HOLLY FAMILY. — Trees or 



shrubs; flowers axillary, greenish, 4 to 8-merous; calyx minute, 

 stamens on base of corolla. 



Petals oval or obovate, pedicels mostly clustered Ilex. 1 



Petals linear, pedicels solitary llicioides. 2 



1. Genus I'-LEX. — Flowers more or less diceciously polygamous; 

 petals oval or obovate ; fruit a berry-like drupe, containing 4r-6 small 

 nutlets. 



I'-lex o-pa'-ca Ait. American Holly. — Small tree with deep-green, 

 somewhat glossy leaves, evergreen, armed with spiny teeth; fruit red. 



I'-lex ver-ti-cil-la'-ta (L.) Gr. Black Alder; Winterberry. — Shrub with 

 oval, obovate or wedge-lanceolate, pointed leaves, acute at base, ser- 

 rate, not evergreen; fruit red. 



2. Genus l-LI-CI-OI'-DES. [Nemopanthes.) — Flowers polygamous^ 

 dioecious; petals oblong-linear; drupe with 4-5 bony nutlets. 



l-li-ci-oi'-des mu-cro-na'-ta (L,.) Britt. (Nemopanthes fascicularis 

 Raf.) Mountain Holly. — Shrub, much branched; leaves oblong, entire 

 or slightly toothed. Damp, cold woods, rare. 



XLVIII. Order CE-LAS-TRA'-CE-/E. STAFF-TREE FAMILY. Shrtibs; 

 flowers small, regular; stamens 4-5 on a disk in the bottom of the 

 calyx. 



Erect shrubs, leaves opposite Euonymus. i 



Shrubby climber, leaves alternate. Celastrus. 2 



1. Genus EU-ON'-Y-MUS. — Flowers perfect; petals romided; shrub 

 with 4-sided branchlets; flowers small, in loose cymes or axillary pedi- 

 cels. 



