78 
Spring Flora of Oklahoma 
tary. Standard violet-purple, emarginate. Stamens exserted. Pod 
glabrous, glandular. 
Along streams. May-July. Common. 
VIII. INDIGOFERA L. 
Herbs, or rarely shrubs, often canescent, with hairs at¬ 
tached by the middle, with odd-pinnate leaves, small stip¬ 
ules, and pink or purple spicate or racemose flowers. Stan¬ 
dard, ovate, or orbicular, sessile or clawed. Wings oblong. 
Keel erect, somewhat gibbous, or spurred. Stamens main¬ 
ly monodelphous, anthers all alike. Pod linear, 4-angled, 
septate between the seeds. 
1. Indigofera leptosepala Nutt. Western Indigo-plant. Per¬ 
ennial, decumbent, pubescent, branching. Leaves short-petioled. 
Leaflets 5-9, oblanceolate or oblong-linear. Spikes, peduncles, loosely 
few-flowered. Flowers pink or purplish. Pods linear, acute, obtusely 
4-angled, reflexed at maturity. 
Prairies. May-November. Frequent. 
IX. CRACCA L. 
Herbs, with odd-pinnate, not punctate, leaves, and pur¬ 
ple, red, or white flowers in terminal or lateral racemes or 
short clusters. Leaflets entire. Calyx-teeth usually near¬ 
ly equal. Petals clawed. Standard orbicular or broadly 
ovate; wings obliquely ovate or oblong; keel curved. Sta¬ 
mens monodelphous; anthers all alike. Pod linear, flat, 2- 
valved, several seeded. 
Raceme terminal, dense, nearly sessile, many-flowered. 
1. C. virginiana. 
Peduncles terminal and lateral, elongated, few-flowered. 
2. C. hispidula. 
1. Craeea virginiana L. Goat’s Rue. Villous or silky pubescent 
with whitish hairs. Roots long, fibrous, tough. Leaves short-peti¬ 
oled. Leaflets 7-25, oblong or linear-oblong. Flowers yellowish- 
purple, crowded into a terminal, often compound, nearly sessile 
raceme. Pod linear, densely pubescent, l'-2' long. 
Dry, sandy and rocky soil. M3ay-July. Frequent. 
2. Cracca hispidula (Michx.) Kuntze. Few-flowered Goat’s 
Rue. Somewhat pubescent, procumbent, much branched, slender, 
