Spring Flora of Oklahoma 
31 
1. Celtis ocddenitalis L. Hackberry. A large or medium-sized 
tree, having much the appearance of an elm, bark dark and rough. 
Leaves ovate, taper pointed at the apex, abruptly obtuse and in¬ 
equilateral at the base, smooth above, usually somewhat downy be¬ 
low. Fruit a small, dark purple drupe. 
On rich soil. Common. April-May. 
2. Celtis mississippiensis Bose. Southern Hackberry. A tree, 
bark gray, often very warty. Leaves broadly lanceolate or ovate, 
long-taper-pointed at the apex, obtuse or sometimes heart-shaped at 
the base, entire or with very few serratures, smooth on both sides, 
3-nerved. Fruit a purplish-black, globose drupe. 
In dry soil. April. 
FAMILY 14. MORACEiE. Mulberry Family. 
Trees, shrubs, or herbs, usually with milky juice, alter¬ 
nate leaves, large, deciduous stipules, and small monoec¬ 
ious, or dioecious flowers crowded in spikes, heads, or 
racemes, or inclosed in a fleshy receptacle. Staminate 
flowers with a usually 4-lobed calyx, and with as many 
stamens opposite the lobes. Filaments usually inflexed 
in the bud, straightening at maturity. Pistillate flowers 
usually 4-sepalous. Ovary 1-2-celled, 1-2-ovuled. Styles 
2. Receptacle and perianth often fleshy at maturity. 
Staminate and pistillate flowers spiked; leaves dentate 
or lobed. I. Morus. 
Staminate flowers racemose or spiked; pistillate capi¬ 
tate. 
Pistillate perianth deeply 4-cleft; leaves entire. 
II. Toxylon. 
Pistillate perianth 3-4 toothed; leaves various. 
III. Papyrius. 
I. MORUS (Tourn.) L. 
Trees or shrubs with milky juice. Flowers monoecious 
or dioecious, the staminate and pistillate flowers on sep¬ 
arate spikes, the pistillate spikes becoming juicy, aggre- 
