96 
Spring Flora of Oklahoma 
simple, without stipules. Flowers small, in crowded clus¬ 
ters. Calyx 3-7-cleft. Petals 3-7. Stamens as many, or 
twice as many, inserted at the base of the disk. Ovary 
in the pistillate flowers 1 or 4 or 5-celled. Ovules 1 in 
each cavity. Fruit a drupe. 
Styles terminal; leaves compound; fruit nearly symmet¬ 
rical. 
Fruit densely pubescent, its stone smooth. 
Flowers in dense, terminal panicles, appearing after 
the leaves. I. Rhus. 
Flowers in clustered spikes, appearing before the 
leaves. II. Schmaltzia. 
Fruit glabrous, or sparingly pubescent, its stone stri¬ 
ate. III. Toxicodendron. 
Styles lateral; leaves simple; fruit gibbous. 
IV. Cotinus. 
I. RHUS. (To.urn.) L. 
Trees or shrubs, with alternate odd-pinnate leaves, no 
stipules, and small polygamous flowers in terminal pan¬ 
icles. Pistil 1, ovary 1-ovuled. Styles 3, terminal. Drupe 
small, 1-seeded, sub-globose, pubescent. 
Rachis of the leaf wing-margined. 1. R. copallina. 
Rachis of the leaf nearly terete. 2. R. glabra. 
1. Rhus copallina L. Upland Sumac. A shrub. Leaves pin¬ 
nate, 6'-12' long. Leaflets 9-12, ovate-lanceolate or oblong-lance¬ 
olate, entire or few-toothed toward the apex. Rachis wing-margined 
between the leaflets. Flowers polygamous, green, in dense, terminal 
panicles. Drupe compressed, crimson, covered with short fine acid 
hairs. 
In dry soil. May-August. Common. 
2. RJius glabra L. Smooth Upland Sumac. A shrub, glabrous 
and somewhat glaucous. Leaflets 11-31, lanceolate or oblong-lan¬ 
ceolate, sharply serrate, rachis not winged. Inflorescence and fruit 
similar to preceding species. 
In dry soil, May-August. Common. 
