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CLASS XIV. DIDYNAMIA. 



Plants bearing Flowers with Four Stamens, of which the 

 two outer are longer. 



Order I. GYMNOSPERMIA. 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 lip of the Corolla very deeply cut into two 



remote lobes. 

 1. A'JUGA. 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 lip of the Corolla vaulted, crenate ; lower 



three-lobed, with two hollow prominences at the base in front. 



9. GALEO'BDOLON. Lower lip of the Corolla in three undivided 



segments. 



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



Stamens finally spreading outwards at each side. 



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



bordered and reflected at each side. 



12. BALLOT A. Calyx with ten furrows. Upper lip of the Corolla 



vaulted, hairv. 



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



rolla straight, linear, cfeft. 



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. MEL1TT1S. Calyx open, wider than the tube of the Corolla. 



Upjjer lip of the Corolla nearly flat. Anthers approaching in pairs 

 and forming a cross. 



15. CLINOPO'DIUM. Calyx many-ribbed. An involucre of nume- 



rous taper leaves under the flowers. 



16. ORI'GANUM. Calyx ribless. Involucres of numerous, dilated, 



flat leaves, one to each flower, collected into a kind of cone. 



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



anther. 



X 2 



