LABIATE 545 



without albumen. Embryo mostly straight: radiele short, 

 inferior. 



I Ovary merely 4-lobed, or not deeply 4-parted. 



Tribe i Stamens mostly exserted from the upper side of the 

 corolla, 4 in all our genera. 



1 Trichostema Limb of the corolla merely or hardly oblique, of 5 some- 



what equal and similar lobes. 



2 Tencrium Limb of the corolla irregular, seemingly bilabiate the 

 upper lip either split down or very short. 



II Ovary deeply 4-parted. 



Tribe ii Stamens not declined, the posterior pair shorter or 

 wanting. 



* Flowers capitate-glomerate : corolla about equally 4-lobed, small 

 and short, hardly irregular, but the upper lobe often broader than the 

 others and emarginate: anther-cells parallel, without any thickish 

 connective. 



3 Mentha Stamens 4, similar and nearly equal. 



4 Lycopus Stamens only 2 with anthers, the upper pair sterile rudi- 



ments or wanting. 



* * Calyx striate-nerved or costate, not much changed in fruit : 

 corolla more or less evidently bilabiate, the upper lip erect, the lower 

 spreading and 3-cleft, destitute of bearded ring within. 



5 Monardella Flowers densely spicate-verticillastrate ; upper lip of the 



corolla 2-cleft : stamens distant and straight, often divergent, never 

 convergent nor curved. 



6 Micromeria Flowers few, in the axils of the leaves : upper lip of the 



corolla plain or slightly concave and straight: stamens unequal exsert- 

 ed : anther-cells often divergent. 



7 Melissa Flowers rather few, in the axils of the upper leaves: corolla- 



tube not longer than the calyx, curved. 



8 Pogogyne Flowers verticillastrate-glomerate and spicate: upper lip 



of the corolla short, erect and entire : stamens ascending and above 

 somewhat approximate in pairs. 



Tribe hi Stamens only 2, the posterior pair rudimentary or 

 wanting, straight or commonly parallel-ascending. 



9 Audibertia Calyx bilabiate and spathaceous, its lower lip 2-cleft: 



filaments exserted and bearing one-celled anthers- 



10 Monarda Calyx elongated-tubular, regular or nearly so: anthers 

 2-celled, both cells fertile and similar. 



Tribe iv Stamens 4, both pairs fertile : the posterior pair 

 longest. 



* Anthers separated or distinct, not approximate in pairs, their 

 eells parallel or nearly so. 



11 Agastache Stamens divergent or distant, exserted. 



* * Anthers more or less approximate in pairs ; their cells divaricate 

 or divergent: filaments ascending, not exserted. 



