106. LABIATE. 



2 or 4 perfect, subequal or didynamous ; anther-cells sometimes 

 confluent. Disc prominent, often irregular. Ovary free 4-lobed or 

 4-partite, consisting of 2, 2-celled and -lobed carpels, style arising from 

 between the lobes, 2-fid or one arm suppressed. Ovules 1 in each 

 cell, erect, anatropous. Fruit of 4 dry (rarely fleshy in genera out- 

 side our area) indehiscent " nutlets " attached by a small basal or 

 oblique or a larger ventral areola. Seeds erect, albumen scanty or 0, 

 radicle inferior. 



I. Ovary 4-partite with o-ynobasic stj'le. Nutlets with small 

 basal or dorso-hasalareole (Genera 1-23) : — 



A. Stamens 4 declinate {lyinff on the lower lip or enclosed 



by it) ; anther-cells confluent Genera 1-9): — 



1. Disc lobes, if developed, alternating with ovary lobes. 



Areole very small, basal :— 



a. Anterior corolla-lobe scarcely longer than posterior, 



neither deeply concave nor constricted at base : — 

 i. Posterior calyx-lobe broader than the others, de- 

 current on the tube and enlarged in fruit :— 

 Style with 2 equal subulate lobes. Cor. -tube 



included or only slightly exserted . . .1. Ocimum. 

 Style undivided, often clavate. Corolla-tube 



exserted . 2. Orfkosiphon, 



ii. Posterior calyx-lobe larger than the others but 

 not decurrent on the tube : — 

 AVhorls in terminal spikes. Fruiting calyx trans- 

 versely ribbed or pitted 3. Geniosporum. 



Fls. in small terminal heads. Fruiting-calyx 

 with gibbous base not transversely ribbed nor 

 pitted 4. Acrocephaliis, 



b. Anterior corolla-lobe deeply concave in front or 



constricted at base :— 

 i. Anterior lip of corolla elongated, not sharply 

 deflexed:— 

 * Filaments free: — 

 Calyx mouth oblique, upper lip usually de- 

 flexed over the mouth in fruit. Fls. in 



dense spikes .5. Anigoehilus. 



Calyx 2-lipped or 5-toothed. Fls. in whorls or 



lax cymes 6. Plectrantkus. 



** Filaments connate below. Whorls usually 



distinct 7. Coleus. 



ii. Anterior lip of corolla short, sharply deflexed . 8. Hyptis. 



2. Disc-lobes opposite to ovary-lobes. Stamens included. 



Areole small, dorso-basallj^ oblique . . . .9. Lavandula. 



B. Stamens not declinate, anther-cells 1-2 (Genera 10-23) :— 

 1. Stamens suberect, diverging and distant. Cor.-lobes 



flat: — 



a. Anthers subglobose, 1-celled, widely expanded 



after shedding pollen. Cor. subequally 4-fid or 

 lower lobe larger : — 

 i. Calyx 5-toothed, lobes not plumose. Filaments 

 bearded : — 

 Inflorescence of panicled sub-capitate cymes. 



Calyx tubular-ovoid. Corolla sub-2-lipped . 10. Pogostemon. 

 Infl. spicate. Calyx minute ovoid. Cor, sub- 

 equally 4-fid \1. Byiophylla. 



ii. Calyx 5-fid, segments finally plumose. Shrub . 12. Colebrookia. 



b. Anthers 2-celled, at least when young. Corolla 



often weakl3^ 2-lipped. Filaments not bearded : — 

 Fls. minute, spicate. Corolla 4-lobed, sub-2-hpped 13. EUholtzia. 

 Fls. small, whorls axillarj^ or spiked. Calyx cam- 



panulate 5-toothed. Corolla subequally 4-lobed . Mentha {^. 7 Al). 

 Fls. small, racemed. Calyx 2-lipped. Corolla-lobes 5 14. Perilla. 



726 



