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CLASS XIV. DIDYNAMIA. 



Plants bearing Flowers with Four Stamens, of which the 

 two outer are longer, 



Order I. GYMNOSPEKMIA. Seeds naked, 

 never more than four. 



* Calyx with five segments, nearly regular. 



14. LEONU'RUS. Anthers sprinkled with hard dots. Upper lip 



of the Corolla very hairy. 



6. GLECHO'MA. Anthers approaching each other in pairs, and 



forming a cross. Upper lip of the Corolla cleft. 

 5. ME'NTHA. Filaments straight, spreading widely. Corolla 

 nearly regular, four-lobed. 



2. TEU'CRIUM. Upper Up of the Corolla very deeply cut into 



two remote lobes. 

 1. A' JUG A. Upper lip of the Corolla minute, notched. 



10. BETO'NICA. Upper lip of the Corolla nearly flat, ascending ; 



the tube cylindrical, incurved. Stamens not longer than 

 the throat. 



7. LA'MIUM. Upper lip of the Corolla vaulted, entire ; lower 



two-lobed, with a tooth on each side of the throat. 



8. GALE'OPSIS. Upper Up of the Corolla vaulted, crenate ; 



lower three-lobed, with two hollow prominences at the base 

 in front. 



9. GALEO'BDOLON. Lower Up of the Corolla in three undi- 



vided segments. 



11. STA'CHYS. Lower lip of the Corolla with reflected _ lateral 



lobes. Stamens finally spreading outwards at each side. 



3. NE'PETA. Lower lip of the Corolla with numerous notches : 



throat bordered and reflected at each side. 



12. BALLO'TA. Calyx with ten furrows. Upper lip of the Co- 



rolla vaulted, hairy, 



13. MARRU'BIUM. Calyx with ten furrows. Upper lip of the 



Corolla straight, linear, cleft. 



4. VERBE'NA. Calyx with one of the five teeth abrupt. Corolla 



nearly equal, curved. Stamens in the tube. 



** Calyx two-lipped. 



19. SCUTELLA'RIA. Lips of the Calyx closing over the fruit ; 



upper lip with a vaulted process. 



17. THY'MUS. Calyx closed with hairs at the mouth. 



18. MELI'TTIS. Calyx open, wider than the tube of the Corolla. 



Upper Up of the Corolla nearly flat. Anthers approaching in 

 pairs and forming a cross. 



15. CLINOPODIUM. Calyx many-ribbed. An involucre of nu- 



merous taper leaves under the flowers. 



16. ORI'GANUM. Calyx ribless. Involucres of numerous, di- 



lated, flat leaves, one to each flower, collected into a kind 

 of cone. 



20. PRUNE'LLA. Filaments forked, one of the points bearing 



the anther. 



X2 



