30 
Spring Flora of Oklahoma 
rough above, pubescent or becoming glabrous beneath, 2'-5' long, 
wide. Flowers fascicled. Calyx 7-9-lobed, oblique, its lobes 
oblong, rounded. Samara ovate-oval, reticulate-veined, 5"-6" long, 
its faces glabrous, its margins densely ciliate. 
In moist soil and along streams. Common. March-April. 
2. Ulmus alata Michx. Winged Elm. Wahoo. A small tree 
with branches corky-winged. Leaves small, ovate-lanceolate, acute, 
sharply serrate, base nearly equal-sided, rough above, downy beneath, 
nearly sessile. Flowers in small clusters. Fruit oblong, downy on 
the sides, ciliate on the edges. 
On rich soil. March. Occasionally producing a second set of 
flowers and fruit from September-November. 
3. Ulmus fulva Michx. Slippery Elm. Leaves large, thick, 
very rough above, downy beneath, ovate or obovate, taper-pointed at 
the apex, unsymmetrical, obtuse or somewhat cordate at the base, 
coarsely and doubly serrate. Calyx lobes and pedicels downy. Fruit 
broadly oval, downy over the seed, the twig smooth. Inner bark 
very fragrant when dried. 
Along streams. March-April. 
II. PLANERA J. F. Gmel. 
Flowers monoecious or polygamous. Calyx 4-5-cleft. 
Stamens 4-5. Ovary ovoid, 1-celled, 1-ovuled, with 2 spread¬ 
ing styles which are stigmatose down the inner side, in fruit 
becoming coriaceous. Trees with small leaves, like those 
of the elms, the flowers appearing with them in small, 
axillary clusters. 
1. Planera aquatiea (Walt.) J. F. Gmel. Water Elm. Nearly 
glabrous. Leaves ovate-oblong, small. Fruit stalked in the calyx, 
beset with irregular rough projections. 
Swamps. Eastern parts of the state. April-May. 
III. CELTIS L. 
Trees or shrubs with entire or serrate, petioled leaves. 
Flowers greenish, axillary, on wood of the same season, the 
staminate in small clusters, the fertile single or 2-3 to¬ 
gether. 
Leaves ovate to ovate-lanceolate, drupe 4"-5" in di¬ 
ameter. 1. C. occidentalis. 
Leaves lanceolate to ovate lanceolate, drupe 3"-4" in 
diameter. 2. C. mississippiensis. 
