50 The Botanical Gazette. [February, 



B Stamens declined toward or resting on the lower lip (C). 

 B Stamens not declined (])). 



C Disk enlarged into glands; posterior calyx teeth broad, with de- 

 current often wing-like margins Ocimum, 6. 



C Disk entire or with an anterior gland; calyx not as above 



Hyptis. 7. 



I) Corolla upper lip not galeate, sometimes slightly concave (E). 



D Corolla upper lip galeate or concave (1). 



E Corolla not strongly bilabiate (F). 



E Corolla bilabiate; fertile stamens 2 only (V). 



E Corolla bilabiate; fertile stamens 4 (Y). 



F Corolla lower lobe large, pendent, fimbriate; stamens straight, 



long, divergent Colliiisonia, 8. 



F Corolla lower lobe spreading, 3-cleft, no bearded ring within (H). 



F Corolla about equally 4-lobed, hardly irregular; stamens erect (G). 



P Corolla tube broad, lobes 5, broad, plane, rather erect; stamens 



4, distant Sphacele, 27. 



6 Fertile stamens 4 Mentha. 9. 



(i Fertile stamens 2; upper corolla lobe entire Lycopus, 10. 



H Stamens distant, straight, never convergent nor curved (I). 

 11 Stamens ascending or arcuate, often converging or parallel (M). 

 1 Fertile stamens 2 only; calyx equajly 5-toothed, throat very vil- 

 lous. . . . ( uiiiht. 11. 



I Fertile stamens 4; calyx throat naked (J). 



1 Fertile stamens 4; calyx throat bearded (L). 



J Corolla upper lip entire or slightly emarginate (K). 



J Corolla upper lip 2-cleft, all the lobes narrow, plane. . . .Monar- 



della, 14. 



K Anther cells linear, divaricate Hyssopus. 12. 



K Anther cells parallel .... Pycnantheiiiimi. 1 L 



L Flowers imbricated with broad, colored bracts. . . .Oiii>amun, 15. 



L Flowers scattered or crowded, bracts inconspicuous. .. .Thy- 

 mus. 16. 



M Calyx < ampanulate or short; corolla tube short, or not exceed- 

 mg the bracts; fertile stamens 4; calyx about ic-nerved, throat naked 

 . . . .Satim-ia. 17. 



M Calyx various, 12 to 15-nerved (X). 



X Upper corolla lip plane or slightly concave and straight (0) 

 X Upper corolla lip concave, erect, straight or a little incurved; 

 calyx 15-nerved (I ). 



Style beardless (P). 



Style villous, sometimes sparingly so; stamens sometimes * 

 only (T). 



