ULMACE^. (elm family.) 439 



Ordkr 125. UliMACE^. (Elm Family.) 



Trees, with watery juice, alternate undivided stipulate leaves, and 

 perfect or ijolygamous apetalous flowers. — Calyx 4:-9-lobed. Sta- 

 mens -1-9, inserted on the base of the calyx, erect in the bud. Ovary 

 1-2-celled. Ovules solitary, suspended. Styles 2, spreading. Fruit 

 membranaceous or drupaceous. Embryo straight or curved, without 

 albumen. Cotyledons leafy. 



Synopsis. 



* Frui dry. Anthers extrorse. 



1. ULMTJS. Flowers perfect. Ovary '2-ceUed. Fruit winged. 



2. PLANERA. Flowers polygamous. Ovary 1-celled. Fruit wingless. 



* * Fruit a drupe. Anthers introrse. 



3. CELTIS. Flowers polygamous. Ovary 1-celled. Cotyledons wrinkled. 



4. TREMA. Flowers polygamous. Cotyledons incurved. Albumen fleshy. 



1. ULMUS, L. Elm. 



Flowers perfect. Cakx bell-shaped, 4-9-cleft. Stamens 4-9, slender, 

 exserted : anthers extrorse. Ovary 2 celled. Styles short. Fruit l-eelled, 1- 

 seeded, surrounded by a broad membranaceous wing. Embryo straight. — 

 Trees. Leaves short-petioled, mostly oblique, doubly serrate, straight- veined. 

 Stipules deciduous. Flowers greenish or purplish, clustered, appearing be- 

 fore the leaves. 



1. U. fulva, Michx. (Slippery Elm.) Brauclilets pubescent; leaves 

 thick, ovate-obh)ng, acuminate, broadly serrate, slightly oblique at the base, 

 very rough above, pubescent beneath ; calyx and short pedicels pubescent ; 

 fruit orbicular, pubescent on the sides, smooth on the margins, with the 

 obtuse teeth erect ; expanding buds rusty-tomentose. — Rich woods, West 

 Florida, and northward. Feb. -March. — A small tree. Leaves 4' - 8' long. 

 Fruit 8" - 9" wide. Inner bark very mucilaginous. 



2. TJ. Floridana, Chapm. Branchlets smooth ; leaves thick, oblong- 

 ovate, acute or slightly acuminate, broadly serrate, oblique at the base, smooth 

 above, more or less pubescent beneath ; ])edicels very slender, somewhat race- 

 mose, and, like the calyx, smooth ; fruit orbicular, fringed on the margins, 

 witii the sliort and broad teeth erect. — Banks of the Chipola River, at Mari- 

 anna, West Florida. Feb. -March. — A tree 30°-40° high, with brittle 

 branches. Leaves .3'— 4' long. Fruit 2" -3" in diameter. Bud scales downy 

 on the margins. 



3. TJ. Americana, L. (Elm.) Branchlets and buds smooth ; leaves 

 tliin, obovate-oblong, or oval, oblitiue at the base, sharply serrate, abruptly 

 acuminate, smooth above, pubescent, or at length smooth beneath ; pedicels 

 clustered, sleiuler, smooth, like the calyx ; fruit oval or obovate, downy on 

 the margins, with the sharp teetli connivent. — Low grounds, Florida, and 

 northward. Feb. - March. — A large tree, with spreading branches. Leaves 

 2' -4' lons^. Fruit 6" long. 



