780 FLORA. 



the limb 4~5-lobed, mostly 2-lipped, regular in a few genera; upper lip 

 2-lobed, or sometimes entire; lower lip mostly 3-lobed. Stamens borne 

 on the corolla-tube, typically 4 and didynamous, sometimes 2, rarely 

 equal ; filaments separate, alternate with the corolla-lobes ; anthers 

 2-celled, introrse, or confluently i-celled, or sometimes of a single sac. 

 Disk usually present, fleshy. Ovary 4-lobed, or 4-parted, superior, each 

 lobe or division with I mostly anatropous ovule ; style arising from the 

 centre of the lobed or parted ovary, 2-lobed at the summit. Fruit of 4 

 i-seeded nutlets. Seed erect (transverse in Scutellarta) ; endosperm 

 scanty, or none; embryo mostly straight ; radicle short, inferior. About 

 160 genera and 3000 species, of wide distribution. The family is also 

 known as LAMIACEAE. 



A. Ovary 4-lobed, the style not basal; nutlets laterally attached. 

 Corolla-limb very irregular, apparently i-lipped, or the other lip very short; stamens 



exserted. 



Upper lip of corolla short, truncate. i. Ajuga. 



Upper lip of corolla 2-lobed, or all the lobes united into the lower lip. 



2. Teucrium. 

 Corolla-limb nearly equally 5-lobed. 



Corolla-lobes spreading; stamens short-exserted. 3. Isanthus. 



Corolla- lobes declined ; stamens long-exserted. 4. Trichostema. 



B. Ovary 4-parted, the style basal; nutlets basally attached. 



* Calyx with a protuberance on the upper side. 5. Scutellarta. 



* * Calyx not gibbous on the upper side. 



Stamens and style very short, included in the corolla-tube. 6. Marrubium. 



Stamens longer, not included in the corolla-tube. 



f Corolla strongly 2-lipped; lips unlike, the upper concave. 



(a) Anther-bearing stamens 4. 



Posterior (upper) pair of stamens longer than the anterior. 

 Anther-sacs parallel or nearly so. 



Tall erect herbs; posterior stamens declined, anterior ascending. 



7. A gas t ache. 

 Trailing herb ; stamens all ascending under upper lip of corolla. 



8. Meehania. 

 Anther-sacs divergent. 



Calyx tubular, nearly equally 5-toothed, not 2-lipped ; plant erect. 



9. Nepeta. 

 Calyx distinctly 2-lipped, or unequally 5-toothed. 



Trailing herb; calyx unequally 5-toothed. 10. Glecoma. 



Erect herbs; calyx 2-lipped. ' \\.Dracocephalum. 

 Posterior pair of stamens shorter than the anterior. 



Calyx distinctly 2-lipped, closed in fruit. 12. Prunella. 

 Calyx 3-io-toothed, not distinctly 2-lipped, open in fruit. 

 Calyx membranous, inflated in fruit, faintly nerved. 



Calyx nearly equally 5-toothed, or 5-lobed. 13. Physostegia. 



Calyx 4-lobed. 14. Synandra. 

 Calyx not membranous, not inflated in fruit, distinctly 5-io-nerved. 



Style-branches very unequal. 15. Phlomis. 

 Style-branches equal, or nearly so. 



Anther-sacs transversely 2-valved. 16. Galeopsis. 

 Anther-sacs not transversely 2-valved, parallel or divergent. 

 Nutlets 3-sided, truncate. 



Calyx-teeth not spiny-tipped. 18. Lamium. 



Calyx-teeth spiny-tipped. 17. Leonvrus. 

 Nutlets ovoid, rounded above. 



Calyx with a spreading 5-toothed limb. 19. Ballota. 

 Calyx-limb not spreading. 



Corolla-tube not longer than the calyx; anther-sacs di- 

 vergent. 20. Stachys. 

 Corolla-tube exserted; lower petioles very long; anther- 

 sacs parallel. 21. Betonica. 

 (b) Anther-bearing stamens 2. 



Connective of the anther very long, bearing a perfect sac at one end, and a rudimentary 



one, or none, at the other. 22, Salvia, 



