Spring Flora of Oklahoma 
67 
with 6-10 pinnae. Leaflets 18-34, the blades crowded, oblong, apicu- 
late, ciliate. Stipules ovate-lanceolate. Pods oblong, 10"-20" long, 
flat, abruptly pointed, contracted into a rather slender stipe. 
In moist or clay soil. Spring and summer. Oklahoma and Com¬ 
anche counties. 
V. PROSOPIS L. 
A much branched shrub or tree 20° high or less, sel¬ 
dom larger, with rigid, tough stems bearing large, stip- 
ular spines. Leaves 2-pinnate, the leaflets few or nu¬ 
merous. Flowers in axillary, pedunculate heads or spikes, 
greenish-white. Calyx campanulate, with 5 short teeth. 
Petals 5, distinct or united below. Stamens 10, distinct. 
Fruit an indehiscent, slightly compressed, straight or 
falcate legume. 
1. Prosopis glandulosa Torr. Prairie Mesquite. A glabrous or 
minutely pubescent shrub, the axils usually with a pair of sharp 
spines. Leaves petioled, with two spreading short-stalked pinme, 
each of numerous sessile linear leaflets. Spike or spike-like racemes 
axillary, many-flowered. Pods linear, stipitate, 4'-8' long, 4"-6" 
wide, constricted between the seeds. 
In dry soil. April-June. Wichita Mountains. 
FAMILY 37. CiESALPINACEiE. Senna Family. 
Trees, herbs or shrubs, with alternate, simple or com¬ 
pound leaves. Flowers mostly clustered and perfect. 
Sometimes monoecious, dioecious or polygamous, nearly 
regular or irregular. Calyx of 5 sepals, or 5-toothed. 
Petals usually 5. Stamens 10 or fewer, the filaments 
distinct or more or less united. Ovary 1-celled, 1-many- 
ovuled. Fruit a legume. 
Trees or shrubs; leaves simple; corolla irregular. 
I. Cercis. 
Herbs; flowers perfect; leaves pinnate or bi-pinnate; 
corolla nearly regular. II. Hoffmanseggia. 
