148 
Spring Flora of Oklahoma 
and crowded. Corolla yellowish-white, pubescent outside, 5"-9" long. 
Nutlets obtuse, distinctly constricted at the base. 
In dry fields and thickets or on banks. May-July. Logan County. 
FAMILY 76. VERBENACEiE. Vervain Family. 
Herbs, shrubs, or trees. Leaves opposite or whorled, 
without stipules. Flowers zygomorphic, in bracted cymes. 
Calyx hypogynous, cleft or toothed. Corolla hypogynous, 
tubular, usually more or less 2-lipped. Stamens usually 
4 (2 long and 2 short), inserted on the corolla tube. 
Ovary usually 2-4-celled, with the style springing from its 
summit. 
Corolla-limb 5-lobed, regular or nearly so; nutlets 4. 
1. Verbena 
Corolla-limb 4-lobed, 2-lipped; nutlets 2. II. Lippia. 
I. VERBENA (Tourn.) L. 
Annual or perennial herbs. Leaves opposite. Flowers 
bracted, variously colored, in terminal, solitary, corymbed 
or panicled spikes. Calyx usually tubular, 5-angled, more 
or less unequally 5-toothed. Corolla salver-form or fun¬ 
nel-form, the tube straight or somewhat curved, the limb 
spreading, 5-lobed. Stamens 4, didynamous, the connec¬ 
tive sometimes with a gland. Ovary 4-celled. The stigma 
2-lobed. Fruit of 4 nutlets separating at maturity. 
Anthers not appendaged. 
Spikes very slender and much interrupted at maturity. 
1. V. xutha. 
Spikes stout, continuous by the imbricated or contig¬ 
uous fruits or if interrupted below, bract as long 
as the calyx or surpassing it. 2. V. bracteosa. 
Anthers of the longer stamens appendaged by a gland 
on the connective. 
Corolla tube about % longer than the calyx, the limb 
4"-5" wide. 3. V. bipinnatifida. 
