284 DICOTYLEDONOUS PLANTS. 



IS. Stem 3 5 feet high. Leaves rough. Flowers small, pur- 

 ple, forming numerous spikes. Vervain. 



2. V. spuria Linn. : stem decumbent, branched, divaricate ; leaves 

 laciniate, much divided ; spikes filiform, loose ; bracts longer than the 

 calyx. 



HAB. Sandy fields. Penn. to Car. W. to Miss. Aug. Oct. 

 . Stem 1 2 feet long. Flowers small, blue, in paniculate 

 spikes, at length scattered. 



** Leaves entire. 



3. V. urticifolia Linn. : erect, somewhat pubescent ; leaves ovate, 

 acute, serrate, petiolate ; spikes filiform, axillary and terminal ; flow- 

 ers distinct, tetrandrous. 



HAB. Roadsides. N. Y. to Car. July, Aug. L. -Stem 23 

 feet high, somewhat hairy. Flowers small, white, tinged with 

 purple, in filiform spikes forming panicles. 



4. V, angvstifolia Mich. : erect, mostly simple ; leaves linear-lanceo- 

 late, attenuate at the base, remotely toothed, with elevated veins ; 

 spikes filiform, solitary, axillary and terminal. V. rugosa Willd. 



HAB. Rocky grounds. N. Y. and Penn. W. to Miss, June 

 Aug. If.. Stem a foot high, hairy. Flowers blue. 



2. -ZAPANIA. Link, 



Calyx 5-toothed. Carol 5-Iobed. Stamens 4, didynamous. 

 Stigma peltately capitate, oblique. Seeds 2, at first covered 

 by an evanescent pericarp. Flowers in heads. 



Didynamia. flngiospcrmia. 



1 . Z. nodifiora Lam. : leaves ovate-wedge-form, serrate above ; 

 spikes solitary, on long filiform peduncles, forming conical heads ; stem 

 herbaceous, creeping. Verbena nodiflora Linn. Lippia nodiflora Mich. 



HAB. Low grounds. Penn. to Car. W. to Miss. July. 21. 

 Stem 6 8 inches long, procumbent. Flowers bluish-white, in 

 heads which are on peduncles 4 6 inches long. 



2. Z. lanceolata Pcrs. : leaves linear-lanceolate, acutely serrate ; 

 spikes solitary, on long peduncles, forming conical heads ; stem her- 

 baceous, creeping. Lippia lanceolata Mich. 



HAB. Banks of streams. Penn. to Car. July, Aug. 21. Does 

 not differ from the former, except in the shape of the leaves ; 

 and is, perhaps, not a distinct species. 



3. PHRYMA. Linn. 



Calyx cylindric ; upper lip longer, trifid ; lower 2-toothed. 

 Corol with the upper lip emarginate, the lower much longer. 

 Seed one. Didynamia. Angiospermia. 



P. leptostachya Linn. : leaves ovate, toothed, petioled ; spikes termi- 

 nal, slender ; flowers opposite. 



