DICOTYLEDONS. 55 



sepals which are distinct or partly united, stamens as many 

 as the sei)als and opposite them ; ovary 1-2-celled, styles 2, 

 spreading; fruit a samara, nut, or drupe. 



I. ULMUS. 



Trees with straight-veined, inequilateral, doubly serrate 

 leaves ; stipules early deciduous ; flowers perfect, calyx bell- 

 shaped, 4-9-cleft, stamens slender, exserted ; ovary com- 

 pressed, styles 2, spreading, fruit membranaceous, flat, 

 winged on the edge. 



1. U. Amebic AXA L. WniXE Elm. A large tree witli gray 

 hark and smooth or slightly pubescent twigs ; leaves oval or ohovate, 

 ahriiptly acuminate at the apex, ohtuse and oblique at the base, 

 slightly rough above, soft pubescent or soon glabrous beneath ; 

 flowers in close fascicles, peduncles slender, smooth ; fruit oval or 

 ohovate, with 2 sharp, connivent teeth at the apex, wing reticulate- 

 veined, downy on the margin. Flowers Februarv-^larch ; fruit ripe 

 April-]\Iay. In moist, rich soil. A widely planted ornamental tree ; 

 wood strong l)ut wai'ping l)adly, and not durable when exposed. 



2. U. ALATA Michx. Winged YjLM. A small tree with branches 

 corky-winged, leaves small, ovate-lanceolate, acute, sharply serrate, 

 base nearly equal-sided, rough above, pubescent beneath, nearly ses- 

 sile ; flowers in small clusters, fruit oblong, downy on the sides, 

 ciliate on the edges. Flowers February-jNIarch ; fruit April-^Iay. 

 On rich soil. Occasionally producing a second set of flowers and 

 fruit from Septemher to November. 



•3. U. FULV^A ]\Iichx. Slippery Elm. A tree of niediuni size 

 with rough pubescent twi^s, and rusty-tomentose bud scales ; leaves 

 large, thick, very rough above, pubescent beneath, ovate or obovate, 

 acumimite at tlie apex, inecpiilateral, ol)tuse or somewhat cordate at 

 th(; base, coarsely and doubly serrate, calyx lobes and pedicels pubes- 

 cent ; fruit broadly oval, pubescent over the seed, the wing smootiu 

 February-Ahirch. Iinier l>ark very fragrant wlien dried, and a popu- 

 lar domestic remedy. 



II. CELTIS. 



Trees or shrubs, with entire or serrate, petiolate leaves; 

 flcnvers grennisli, axillary, on w^ood of the same season, the 

 staminate in small clusters, the fertile single or 2-3 together. 



