76 
Spring Flora of Oklahoma 
Plants leafy-stemmed. 
Flowers small, 2"-4" long. 
Pods sub-globose. 1. P. lanceolate. 
Pods ovoid, or ovate. 
Pods with a snort, mostly abrupt beak. 
Flowers few, scattered in slender elongated 
racemes. 2. P. tenuiflora. 
Flowers numerous, clustered, or crowded in 
racemes. 3. floribunda. 
Pods with a slender, sharp, or elongated beak. 
Leaflets linear; flowers in loose, elongated race¬ 
mes. 4. P. linearifolia. 
Leaflets linear-lanceolate, oblong, oblanceolate 
or ovate; flowers spiked. 
Leaflets linear-lanceolate, calyx inflated in 
fruit. 5. P. digitata. 
Leaflets oblong; calyx not inflated in fruit. 
6. P. argophylla. 
Flowers large, 6"-8" long, densely spicate. 
7. P. cuspidata. 
Plants acaulescent, or nearly so, low, spreading; roots 
tuberous. 8. P. esculenta. 
1. Psoralea lanceolata Pursh. Lance-leaved Psoralea. Glab¬ 
rous or nearly so, yellowish-green, densely punctate. Leaflets 3. linear 
to oblanceolate. Flowers small, in very short spikes. Calyx about 
1" long, with short broad teeth. 
Dry soil. May-July. Northwest part of state. 
2. Psoralea tenuiflora Pursh. Few-flowered Psoralea. Up¬ 
right, slender, bushy and branching, 2°-4° high, covered when young' 
with a fine, grayish down. Leaves palmately compound, with 3-5 
linear to obovate-oblong leaflets, covered with glandular dots. Flow¬ 
ers purplish, 2"-3" long, loosely racemed. Pods rough with glands. 
Prairies. May-October. Common. 
3. Psoralea floribunda Nutt. Many-flowered Psoralea. Pro¬ 
fusely branching, canescent, not glandular. Leaves 3-5 sometimes 
7-foliolate. Leaflets 5"-18" long, li4"-4" wide, oblong, glandular on 
both surfaces, rugose, glabrous, or with a few, scattered hairs above, 
canescent with closely appressed white hairs beneath. Spikes or 
