VASCULAR PLANTS. 49 



0. Corolla 4 — 2-parted; petals 4, 2 or 0. Ovary 

 2-locular; loculi 2-ovulate; stigma sessile, 2- 

 cleft. Fruit a samara. *? . 



ORDER V. LAMIALES. 



Corolla 2-labiate. Number of stamens less 

 than lobes of tlie corolla. Ovaries 2 — 4 ,or 

 ovary 2 — 4-locular; loculi 1, 2 or 4-ovulate. 

 Fruit akene, drupe or capsule. Leaves oppo- 

 site; stipules 0. 



Family XII. Labiatae. 



Ovary 4-cleft, 4-ovulate, inserted on a hypo- 

 gynous disk. Style 1. Fruit 4 akenes. 



1. Mentha, L 



Calyx 5-dentate, Tube of corolla included; 

 limb exserted, 4-lobed; upper lobe the largest. 

 Stamens 4, not didynamous, erect, distant; an- 

 thers bilocular; loculi parallel. 2£. 



2. Lycopus, Touru. 



Diandrous. Posterior pair of stamens 0, or 

 sterile. Otherwise as Mentha. If. 



<S- Pycnanthemum, Beuth. 



Corolla tube as long as the calyx; limb 2-lab- 

 iate; upper lip nearly entire; lower 3-lobed; 

 lobes obtuse. Stamens 4, straight, divergent; 

 loculi of anthers parallel. U • 



3 



