Spring Flora of Oklahoma 
79 
l°-2° long. Leaves petioled, leaflets 5-19, short-stalked, oval, oblong, 
oblanceolate or obovate, narrowed, rounded or cuneate at the base, 
obtuse, emarginate or acute at the apex. Peduncles lateral or ter¬ 
minal, slender, 2'-4' long. Flowers red-purple, few, terminal, about 
6" long. Pod linear, long, 2" wide, finely pubescent. 
Dry soil. May-August. 
X. ROBINIA L. 
Spiny trees or shrubs with odd-pinnate leaves, rather 
large, white or pink flowers in crowded, axillary, short- 
peduncled racemes. Stamens diadelphous. Pod flat, linear, 
not septate between the seeds, tardily 2-valved. 
1. Robinia Pseudo-Acacia L. Black Locust. A tree of medium 
size, with rough bark. Leaflets 9-15, ovate or oblong, obtuse and 
slightly mucronate at the apex. Stipules forming persistent spines. 
Racemes loose, pendulous, 3'-5' long. Flowers white, fragrant. Pod 
smooth, 4-8-seeded. Introduced and quite common. 
Rich soil and in cultivation. Common. 
XI. GEOPRUMNON. Rydb. 
Perennial herbs, with tufted, decumbent or ascending 
stems, odd-pinnate leaves with entire leaflets, and rather 
large, showy, flowers in peduncled, axillary racemes. Stand¬ 
ard rather narrow, erect, notched, longer than the wings. 
Keel shorter than the wings. Stamens diadelphous, the 
anthers all alike. Pod globose, fleshy, becoming spongy, 
indehiscent, completely 2-celled. 
Pod ovoid, about 6" long, not wrinkled. 
1. G. plattense. 
Pod oblong, curved, 1' long or more. 
2. G. tennesseense. 
1. Geoprumnon plattense (Nutt.) Rydb. Platte Milk Vetch. 
Villous-pubescent with spreading hairs, prostrate or ascending, 6'-12' 
high. Leaflets 13-29, oblong to ovate, obtuse at the apex, narrowed 
at the base, 4"-9" long, about 2" wide. Flowers yellowish-white or 
tipped with purple, about 9" long in short heads. Pod ovoid, pointed, 
smooth, loosely pubescent, nearly straight. 
Prairies. May. Common. 
2. Geoprumnon tennesseense (A. Gray) Rydb. Tennessee Milk 
Vetch. Stem erect or ascending from a deep root. Plant villous 
