416 ULMACEiE. (HLM FAMILY.) 



Order 125. ULMACE^. (El.m Family.) 



Trees, with watt-iy juice, alternate umlivided stipulate leaves, and per- 

 fect or polygamous apetalous llowei-s. — Calyx 4 - 9-lobed. Stamens 4-9, 

 inserted on the base of the calyx, erect in the bud. Ovary 1 - 2-c-elled. 

 Ovules solitary, suspended. Styles 2, spreading. Fruit membranaceous 

 or drupaceous. Embryo straight or curved, without albumen. Cotyle- 

 dons leafy. 



Synopsis. 



* Fruit dry. Anthers pxtrorse. 



1. ULMUS. Flowers perfect. Ovary 2-celled. Fruit winged. 



2. PLANKRA. Flowers polygamous. Ovary 1-celIed. Fruit wingless. 



* * Fruit a drupe. Anthers introrse. 

 8. CELTIS. Flowers polygamous. Ovary 1-cellcd. Cotyledons curved. 



1. ULMUS, L. Elm. 



Flowers perfect. Calyx bcU-shapcd, 4 - 9-cleft. Stamens 4-9, slender, ex- 

 sorted : anthers cxtrorse. Ovary 2-cclled. Styles short. Pruit 1 -celled, 1 -seeded, 

 surrounded by a broad mcmbraiiaccous wing. Embryo straight. — Trees. 

 Leaves sliort-petioled, mostly oblique, doubly serrate, straight-veined. Stipules 

 deciduous. Elowcrs greenish or purplish, clustered, appearing before the leaves. 



1. U. fulva, Miclix. (Slippery Elm.) Branchlets pubescent; leaves 

 thick, ovate-oblong, acuminate, broadly serrate, slightly ohliijue 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 ; cxi)andin'r buds rustv-tomcntose. — Kich woods. West Florida, and north- 

 ward. Feb. and March. — A small tree. Leaves 4' -8' long. Fruit 8" -9" 

 wide. Inner bark very mucilaginous. 



2. U. Floridana, n. sp. Branchlets smooth ; leaves thick, oblong-ovate, 

 acute or slightly acuuiinate, broadly serrate, oblicpic at the base, smooth above, 

 more or less pubescent beneath ; pedicels very slender, somewhat racemose, and, 

 like the calyx, smooth; fruit orbicular, fringed on the margins, with the short 

 and l)roa(l teeth erect. — Banks of the Chipola Kiver, at Marianna, West Florida. 

 Feb. and March. — A tree 30° -40° high, with brittle branches. Leaves 3' -4' 

 long. Fruit 2"-;)" in diameter. Bud-scales downy on tiie nnirgins. 



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

 thin, obovate-oblong, or oval, oblicjuc at the base, sharply serrate, abruptly acu- 

 minate, smooth aijove, pubescent, or at length smooth beneath ; pedicels clustered, 

 slender, smooth, like the calyx ; fruit oval or obovate, downy on the margins, 

 with tlic sharp teeth connivent. — Low grounds, Florida, and northward. Feb. 

 and March. — A large tree, with spreading branches. Leaves 2' -4' long. 

 Fruit 6" long. 



Var. ■? aspera. Leaves larger (3' -G') on shorter jietioles, oval-oblong, acn- 

 minate, very obiiipie or half-conlatc at the base, very rough above, pubescent 



