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2. Mentha L. Mint. 

 Calyx o-clentate. Tube of corolla included, 

 limb exserted, 4-lobed; upper lobe the larg- 

 est. Stamens 4, scarcely didynamous, erect, 

 distant. Anthers 2-celled. Cells parallel. — U- 



1. M. viRiDis L. Inflorescence terminal; 

 dense glomerules, crowded around narrow 

 spikes; spikes leafless; leaves almost sessile. 

 Irrigated grounds. Summer. Autumn. Es- 

 caped from cultivation. Native of Europe. 

 (Spearmint.) 



2. M. PIPERITA L. Inflorescence terminal; 

 glomerules on uninterrupted narrow spikes; 

 spikes leafless; leaves distinctly petioled; flow- 

 ers pale. — Irrigated grounds. Summer. Au- 

 tumn. Escaped from cultivation. Native of 

 Europe. (Peppermint.) 



3. M. Canadensis L. Inflorescence axil- 

 lary; uppermost axils of leaves without flow- 

 ers. — Wet places. Native species. Summer. 



3. Lycopus Tourn. Watek Horehound. 



Diandrous. Posterior pair of stamens or 

 sterile. Otherwise as Mentha. — 71. 



1. L. LUCIDUS Turcz. Flowers pale — Marin 

 County. Aquatic. Summer. 



4r Pycnanthemum Benth. Mountain Mint. 



Corolla tube as long as the calyx, limb 2- 

 labiate, upper lip nearly entire. Lower lip 



