Class XIV. Order I. 149 



on long, axillary stalks. Flowers small, blue, numerous, inter- 

 spersed with small leaves. The singularity of this genus con- 

 sists in the form of the calyx, which is furnished with a ridge on 

 the upper side, the part beyond this serving as a lid. After 

 the corolla falls, this lid shuts down against the opposite side, 

 so as perfectly to inclose the seeds. By lateral pressure the lid 

 opens, discovering the four seeds within. Meadows. July. 

 Perennial. 



183. PRUNELLA. 

 PRUNELLA PENNSYLVANIA. Willd. Self heal. 



Leaves petioled, ovate-lanceolate, toothed ; up- 

 per lip of the calyx truncated, three awned ; stem 

 ascending. 



A handsome plant, native of meadows and moist pas- 

 tures. Stem nine or ten inches in height, hairy. Leaves oppo- 

 site, broad-lanceolate, slightly toothed, their nerves and pe- 

 tioles hairy, the upper pair close to the spike and sessile. 

 Spike short, ovate. Bractes reniform, ciliate. Flowers rin- 

 gent, purplish. Calyx two lipped, the upper lip broad and 

 abrupt, with three straight, short bristles or awns ; the lower 

 lip ending in two acute teeth. July. Perennial. 



184. TRICHOSTEMA. 



TRICHOSTEMA DICHOTOMA. L. Trichostema. 



Stamens very long, exserted. L. 



An annual plant, remarkable for its long, arching stamens. 

 Stem round, somewhat four sided, hairy. Branches opposite, 

 subdivided in a brachiate manner, their last divisions common- 

 ly, though not always, dichotomous. Leaves oval-lanceolate, 

 obtuse, entire. Flowers numerous, terminal. Calyx swelling, 

 its upper lip of two short, acute teeth ; lower lip twice as long, 

 three toothed. Corolla purple, with two long, slender stamens 





