DRDER XCI. — LABr.vr^E. 403 



6. Upper lip of the corolla emarginate CuniUt, 4 



Upper lip linear, iaclosing tho stamens Jlonarda, 1-1 



7. Calyx bilabiate 8 



Calyx not bilabiate 12 



8. Calyx closed by a lid of a flower Scutellat'ia, 19 



Caiyx not closed by a lid 9 



9. Flowers blue Tric/iostema, 2G 



Flow ers not blue 10 



1 0. Stamens exserted Ceranthera, 9 



Stamens included U 



11. Flowers in spikes Prunella, 18 



Flowers in opposite clusters Catamintha, 8 



12. Calyx lO-toothed Marrubium, 21 



Calyx 3-clert Macbridea, 20 



Calyx 5-clel't, or toothed 13 



18. Stamens lonirer th:in the corolla 14 



Stamens sliorter than the coroila : 16 



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



Corolla bilabiate 11 



15. Flowers in spikes Ifi/asopus, 1 1 



Flowers in racemes Teucriurn, 27 



Flowers in heads or whorls Pycnantkein urn, 5 



16. Flowers purple 17 



Flowers not purple 19 



17. Leaves cordate 20 



Leaves not cordate 18 



18. Flowers in terminal spikes Dracocephalum, IG 



Flowers in whorls Stachy.% 22 



19. Corolla campanulate : Isantlms, 25 



Upper lip of the corolla entire Leonnrus, 23 



Upper lip of the corolla 2-cleft Ilijptis, 1 



20. Flowers purple, stem creeping Cedi-onella, 17 



Flowers purple, stem not creeping Lamium, 24 



Flowers nearly white Ncpeta, 15 



Genus I— HYP'TIS. Jacq. 13— L 

 (From hyptios, resupinate; the limb of the corolla is turned on its b.ack.) 



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

 cleft, the h^wer -S-parted, the middle segment forming a small 

 sack. Stamens 4, inserted into the tube. 



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

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

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

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

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



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

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

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

 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 3fentfi0, a daughter of Cocytus, who was turned into mint.) 



Calj/x tubular, ciliate, glabrous, o-toothed. Corolla funnel- 

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

 segment broad-emarginate. Sfa?ncns erect, distant, e(iual. 



