71. MORACEAE 157 



1. Flowers ncaily srssil(> in erect dense clusters; branches not coi ky- 

 winged. 

 4. Buds reddisii-jjubescent ; stamens 5-9; samaras pubescent in 

 the center; mature leaves harshly scabrous-jjubescent, 10-20 

 cm lona;, with characteristic slippery-elm odor; woods, com- 

 mon. Apr. [L\ julva Michx.] Slippeiy Elm U. rubra Muhl. 



4. Buds and twigs glabrous; stamens 4 or 5; samaras glabious; 

 leaves smooth, 2-7 cm long; small tree, frequently planted, 

 occasionally found wild; native of Asia. Mar.-Apr. Siberian 

 Elm U . purnila L. 



2. Planera J.F.Gmel. — Water Elm 

 P. aquatica [Walt. J J. F. Gmel. Swamps, not common; known from 

 Alexander, Johnson, Massac, and Pulaski counties. Apr.-May. 



3. Celtis L. — Hackberry 



1 . Leaxes sharply serrate; drupes 7-9 mm in diameter at maturity; 



fruiting pedicels longer than the petioles; nutlet brownish, 6-8 



mm long, obovoid, pitted; tree, 10-20 m tall; woods, usually 



near streams, common. Apr.-May. Hackberry {C. crassijolia 



Lam.] - - C. Qccidcntalis L. 



1. Leaves entire or with a few teeth; nutlet 5-6 mm long, globose, 

 pitted. 

 2. Leaves lanceolate, long-acuminate, usually broadly cimeate at 

 base; fruiting pedicels longer than the petioles; drupes 4-6 

 mm in diameter; tree, 10-30 m tall: woods and river banks, 

 s. 111., in the valley of the Wabash R., northward to Lawrence 

 Co., and the Mississippi valley northward to Adams Co. 



Sugarberry [C. mississippiensis Bosc] C. laevigata Willd. 



2. Leaves ovate, short-acuminate, usually rounded or subcordate at 

 base; fruiting pedicels about as long as the petioles; drupes 

 6-8 mm in diameter; shrub or small tree to 4 m tall; rocky 

 banks of streams, rare and local; s. 111., northward along the 



Mississipj^i R. to Henderson Co. Dwarf Hackben-y 



C. puiuila (Muhl.) Pursh 



71. Moraceac Lindl. — Mulberry Family 



I . Leaves serrate or lobcd, more or less 3-veined from the base; branches 

 never spiny. 

 2. Twigs glabrous or pubescent; leaves alternate; bud-scales 3-6; fruit 

 aggregate, ellipsoid, edible 1. Morus 



2. Young twigs hirsute: leaves often opposite: buds with 2 or 3 scales: 

 fruit in globose heads, not edible 2. Broussonetia 



l.Lea\-es entire, pinnately-veined ; branches usually spins, staminatc flowers 

 in loose racemes, the pistillate in globose heads; fruit large, globose, 

 yellowish-green, 8-12 cm in diameter 3. Madura 



