ORDER XCI. LABIATE. 463 



6. Upper lip of the corolla emarginate Cunila, 4 



Upper Hp linear, inclosing the stamens Monarda, 14 



7. Calyx bilabiate 8 



Calyx not bilabiate 12 



a Calyx closed by a lid of a flower Scutellaria, 19 



Calyx not closed by a iid 9 



9. Flowers blue Tricliontema, 26 



Flowers not blue 10 



10. Stamens exerted Ceranthera, 9 



Stamens included 11 



11. Flowers in spikes Prunella, 18 



Flowers in opposite clusters Calamintha, 8 



12. Calyx W-toothed Jfarrubiuni, 21 



Calyx 3-cleft Macbridea, 20 



Calyx 5-cleft, or toothed 13 



18. Stamens longer than the corolla 14 



Stamens shorter than the corolla 16 



14. Corolla consisting of 4 nearly equal lobes Mentha, 2 



Corolla bilabiate 11 



15. Flowers in spikes Hyssopus, 11 



Flowers in racemes Teuerium, 27 



Flowers in heads or whorls Pyaianthemum, 5 



16. Flowers purple 17 



Flowers not purple 19 



17. Leaves cordate 20 



Leaves not cordate 18 



18. Flowers in terminal spikes Dracocephalum, 16 



Flowers in whorls Stachys, 22 



19. Corolla campanulate Isanthus, 25 



Upper lip of the corolla entire Leonurus, 23 



Upper lip of the corolla 2-cleft Hyptis, 1 



20. Flowers purple, stem creeping Cedronella, 17 



Flowers purple, stem not creeping Lamiwm, 24 



Flowers nearly white Nepeta, 15 



Gexus L— HYP'TIS. Jacq. 13—1. 

 (From hypiioi, resupinate ; the limb of the corolla is turned on its back.) 



Calyx 5-toothed, tubular. Corolla ringent ; the upper lip 2- 

 cleft, the lower 3-parted, the middle segment forming a small 

 sack. Stamens 4, inserted into the tube. 



1. H. radia'ta, (L.) Stem erect, square, pubescent. Leaves sessile, 

 ovate-lanceolate, pubescent, tapering at the base, dentate. Flowers in 

 axillary heads, on long peduncles ; involucre about 12-leaved. Calyx 

 pubescent, 5-toothed, teeth linear. — White, tinged with purple. If. 

 July — Sept. Damp soils. Common. 3 — 4 feet, 



2. II. spica'ta, (Poit.) Branches nearly glabrous or scabrous, angu- 

 lar. Leaves ovate, acute, unequally serrate, cuneate, glabrous, or pu- 

 bescent above. Heads in lax, paniculate racemes ; bracts ovate, short- 

 er than the calyx ; calyx inflated at the base, elongated ; corolla small, 

 white within. Achenia small, black. — Violet. Florida. 10 — 12 inches. 



Genus II.— MENTHA. L. 13—1. 

 (From Menthe, a daughter of Cocytus, who was turned into mint.) 



Calyx tubular, ciliate, glabrous, 5-toothed. Corolla funnel- 

 shaped, with the border nearly equally 4-cleft, with the upper 

 segment broad-emarginate. Stamens erect, distant, equal. 



