Spring Flora of Oklahoma 
149 
Corolla tube about twice as long as the calyx, the limb 
5"-8" wide. 4. V. canadensis. 
1. Verbena xutha. Lehm. Perennial or annual, pubescent. Leaves 
incised-pinnatifid, or 3-parted on the lower part of the stem, strigose 
to canescent, the segments coarsely-toothed to laciniate. Spikes rath¬ 
er slender, strict. Calyx becoming 2" long, strigose. Corolla blue 
to purple, its tube shorter than the calyx, limb about 2" broad. Nut¬ 
lets narrowly oblong. 
On open places. May-September. Payne County. 
2. Verbena bracteosa Michx. Large-bracted Vervain. Peren¬ 
nial, hirsute pubescent. Stem decumbent or ascending. Leaves ovate 
or oval in outline, pinnately incised or pinnatifid, the lobes mostly 
dentate. Spikes sessile, dense. Bracts linear-lanceolate, longer than 
the flowers and fruits, the lobed ones often incised. Corolla purplish- 
blue, about 2" long. 
On prairies and waste places. May-August. Frequent. 
3. Verbena bipinnatifida Nutt. Small-flowered Verbena. Per¬ 
ennial, producing suckers, hirsute or hispid. Stems erect, 6'-18' high. 
Leaves firm, deeply 1-2-pinnatifid into linear or linear-oblong lobes. 
Spikes solitary at the ends of the branches, dense. Bracts linear- 
subulate, about as long as or somewhat exceeding the calyx. Corolla 
6"-9" long, purple or lilac, the limb 4"-7" broad. Nutlets promin¬ 
ently wrinkled above. 
On dry plains and prairies. April-September. Frequent. 
4. Verbena canadensis (L.) Britton. Large-flowered Verbena. 
Perennial. Pubescent or glabrate. Stem slender, ascending. Leaves 
membranous, ovate in outline, irregularly-toothed, or pinnately-in~ 
cised, often 2-cleft, the lobes dentate. Spikes solitary at the end 
of the branches, dense. Bracts linear-subulate, mostly shorter than 
the calyx. Corolla 10"-12" long, blue, purple, or white. Nutlets 
wrinkled all over. 
In dry soil. May-August. Frequent. 
II. LIPPIA Houst. 
Perennial herbs or shrubs. Leaves opposite, sometimes 
verticillate. Flowers bracted, in axillary or terminal, most¬ 
ly peduncled, spikes or heads. Calyx membranous, ovoid, 
campanulate or compressed, and 2-winged, 2-4-toothed or 
2-4-cleft. Corolla-tube straight or incurved, cylindric, 
somewhat 2-lipped, 4-cleft. Stamens 4, didynamous. Ov¬ 
ary 2-celled. Stigma oblique or recurved. Fruit dry, at 
length separating into 4 nutlets. 
