342 LABIATE. 



TRIBE I. AJUGOIDE^E. Stamens ascending, mostly exserted from the upper side 

 of the corolla, 4 in all our genera. Nutlets obovoid, dry. Ovule and seed more 

 or less amphitropous : calyx 5-10-nerved. 



* Limb of the corolla merely or hardly oblique, of 5 somewhat equal and similar lobes, 

 therefore obscurely if at all bilabiate. 



1. TETRACLEA. Calyx deeply 5-cleft, regular; the lanceolate lobes twice the length 

 of the short turbinate tube. Corolla nearly salverform in anthesis, with narrow tube sur- 

 passing the calyx ; limb globular and erect (not oblique) in the bud ; lobes oval oroblong- 

 obovate, similar and equally spreading, the three lower obscurely more united at base. 

 Filaments filiform, involute in bud, exserted : anthers cordate-oblong ; cells permanently 

 parallel and distinct. Ovary barely 4-lobed. Ovule and s-eed dcscending-amphitropous, 

 i. e. attached above its middle, rostellate at the micropyle. Areola of the nutlet very 

 large and ventral. 



2. TRICHOSTEMA. Calyx barely 5-cleft, either oblique or almost regular. Corolla 

 with narrow tube and more or less oblique limb; the somewhat similar lobes oblong, more 

 or less declined. Filaments spirally coiled in the oblique unopened limb, curved in an- 

 thesis, capillary, very long-exserted, didynamous, sometimes monadelphous at- base : 

 anther-cells divaricate or divergent, at length often confluent. Ovary deeply 4-lobed. 

 Amphitropous ovule and seed ascending, being attached below the middle. 



3. ISANTHUS. Calyx nearly equally 5-clcft, campanulate ; lobes lanceolate. Corolla 

 short; tube included in the calyx; throat somewhat campanulate ; limb almost regularly 

 5-parted ; lobes obovate, not declined. Stamens slightly incurved-ascending, not longer 

 than the corolla, didynamous : anther-cells at length divergent. Ovary deeply 5-lobed. 

 Ovule and seed nearly anatropous and erect. Areola of nutlet introrsely basal. 



* * Limb of corolla irregular, seemingly unilabiate ; the upper lip being either split down 

 or very short : stamens exserted from the cleft. 



4. TEUCRIUM. Corolla deeply cleft between the two small lobes of the upper lip, 

 which are united one on each side with the lateral lobes of the declined lower lip; middle 

 lobe much larger. Anthers confluently one-celled. Nutlets with a broad introrse areola. 



5. AJUGA. Corolla with very short and as if truncate upper lip ; the large and spreading 

 lower lip with middle lobe emarginate or 2-cleft. Anther-cells less confluent. 



II. Nutlets smooth or granulate; areola basal, small: ovary deeply 4-partcd. 



TRIBK II. OCIMOIDE./E. Stamens declined toward or resting on the lo\ver lip of 

 the corolla, didynamous, all fertile. Corolla declined; lower lip apparently formed 

 of the anterior lobe only, which is unlike the other somewhat equal four lobes. 



6. OCIMUM. Calyx deflexed after flowering ; its posterior tooth broad, orbicular or 

 obovate, and with decurrent often wing-like margins ; the 4 others narrower. Corolla 

 with short tube, and flat or concave declined lower lobe. Disk enlarging into glands. 



7. HYPTIS. Calyx mostly equally 5-toothcd. Corolla with the lower lobe saccate, 

 abruptly deflexed at the contracted and callous base. Disk entire or with a gland on the 

 anterior side. Nutlets ovoid or oblong. 



TUIBK III. SATUREIXE.E. Stamens not declined; the posterior pair shorter or 

 wanting: anthers (in ours) 2-celled; the cells distinct or more or less confluent, 

 short. Corolla less strongly bilabiate and the lobes flatter than in succeeding tribes; 

 upper lip not galeate or concave, except in Acantlwmintha. 



* Corolla with lower lobe larger and pendent, fimbriate or lacerate-toothed, very unlike 

 the 4 shorter and nearly equal lobes, which in appearance form the upper lip: stamens 

 straight and long, divergent: anther-cells divaricate and contiguous, or at length some- 

 what confluent : flowers in terminal racemes. 



8. COLLINSONIA. Calyx short, small in flower, enlarging and declined in fruit, about 

 10-nerved, mostly somewhat hirsute in the throat, bilabiate ; the broader and at length 

 flattish upper lip 3-toothed ; the lower 2-parted. Corolla elongated, somewhat funnelform, 

 with a bearded ring inside at the insertion of the stamens. Stamens 2 or 4, much exserted, 

 spirally coiled in the bud. 



* * Corolla about equally 4-lobcd, small and short, hardly irregular, but the upper lobe 

 often broader than the others and emarginate: stamens erect, straight and distant: 

 anther-cells parallel, destitute of any thickish connective: flowers capitate-glomerate, 

 and the clusters sometimes confluent-spiked. 



9. MENTHA. Stamens 4, similar and nearly equal. Calyx campanulate or short-tubular, 

 and 5-toothed. Upper lobe of corolla sometimes emarginate. 



