440 ULMACEAE 
Famity 4 ULMACEAE — Erm FAMILY 
Shrubs or trees, the sap watery. Leaves alternate: blades inequi- 
lateral, aeai toothed. ONES perfect, polygamous or monoecious, 
variously disposed. Calyx of 4 or 5, or rarely 3-9 partially united sepals. 
Androecium of usually as many stamens as there are sepals. Gynoecium 
2 united carpels. Fruit a samar a drupe, or nut-like. ee 13 
genera and 140 species, widely distributed.. ——Ours have greenish flowers 
Fruit dry, a samara, or nut-like: anthers introrse: embry 
straight. ribe I. ULMEAE. 
Fruit a drupe: anthers extrorse: embryo with conduplicate 
cotyledons. Tribe II. CELTIDEAE. 
I. ULMEAE 
Flowers perfect: fruit a sama 1. ULMUS. 
Flowers polygamo-monoecious : fruit nut-like, tubercled. 2. PLANEBA. 
ELTIDEAE 
Flowers solitary or merely clustered : oe on 3. CELTIS. 
Flowers in dichotomous cymes: dru 
Stigmas entire: staminate flowers - with valvate calyx-lobes. 4, TREMA. 
Stigmas 2-cleft: staminate flowers with imbricate calyx- -lobes. 5. MOMISIA. 
1. ULMUS [Tourn.] L. Shrubs or trees, with furrowed bark and some- 
times winged branches. Leaves deciduous: blades toothed. Calyx campanu- 
late. Ovary sessile cr nA So, smooth, but sometimes pubescent. Samara 
or Aeular to oblong. About 1 6 species, natives of t orthern Hemisphere.— 
The inner bark of some species is used for a ropes and coarse cloth. 
Some species are extensively used for shade trees.—ELMs 
Flowers and fruits autumnal: flower-clusters in the leaf-axils. I. SEROTINAE. 
Flowers and fruits vernal: flower-clusters on naked branches. II. AMERICANAE. 
Leaf-blades obtuse: samaras ciliolate. E crassifolia. 
Leaf-blades acute or short-acuminate : samaras ciliate. X U. serotina. 
II. AMERICAN 
EE long: pedicels ne than the UE samara deeply notched. 
Sam over twice as long as wide : branches corky wine Eo 3. U. alata. 
Samara less than twice as fone. as wide: branches wingle 
Samara ovate, Lod tips erect or nearly so: leaf- igs 
mainly glabro 4. U. floridana. 
P oval r “obovate, the tips converging: leaf-twigs 
inly pubes 5. U. americana. 
miowerclusters denso. e Dedicel Shorter than the calyx: samara 
not notched. 6. U. fulwa. 
1, U. crassifolia Nutt. Tree becoming 30 m. ta ll, the branches often corky- 
ed, the twi ER n leaf-blades p varying to bro ~ elliptic 
or ova ate, 1.5—4 cm. long, obtuse, om ser | 
rate, rough BBC. petioles 1-2 mm. long: 
uds about 1.5 mm. long: samara oval, Si 
mm. long, ciliolate —(CE 
vods and river-bottoms, Coastal Plain Em 
adj. provinces, Miss. to and 
(Mex.)—Late sum.—fall. 
2. U. serotina Sarg. Tree becoming 16 
tall, the branches often corky- a the 
twigs glabrous, at least at maturity: leaf- 
rM M dos ps Bu or ui adest above the 
ong, acuminate, 
coarsely serrato, poer snore: petioles A. 
m. long: ea 5-3 mm ara 
SORGE. elliptie, 7-32 mm. us te 
