| * Leaves usually sharply serrate | 1. |
| * Leaves almost entire | 2. |
C. occidentàlis.
1. Céltis occidentàlis, L. (Sugarberry. Hackberry.) Leaves ovate, obliquely subcordate to truncate at base, long-acuminate, serrate (at least near the apex), rough above and hairy beneath. Fruit a single-seeded, ¼ in., globular drupe, solitary on a peduncle, 1 in. long, in the axils of the leaves; purple when ripe in autumn.
Shrub (var. pumila) to large tree, 6 to 50 ft. high; throughout; rare north, abundant south. Sometimes cultivated. The branches are numerous, slender, horizontal, giving the tree a wide-spreading, dense top.
C. Mississippiénsis.
2. Céltis Mississippiénsis, Bosc. Leaves almost entire, with a very long, tapering point, a rounded and mostly oblique base, thin and smooth. Fruit smaller than that of the preceding species. A small tree with rough, warty bark. Illinois and southward.
Genus 77. MACLÙRA.
Trees or shrubs with milky juice and simple, alternate, entire, deciduous leaves, generally having a sharp spine by the side of the bud in the axils. Flowers inconspicuous; in summer. Fruit large, globular, orange-like in appearance.