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LABIATZ 545 
without albumen. Embryo mostly straight: radicle short, 
inferior. 
I Ovary merely 4-lobed, or not deeply 4-parted. 
TRIBE. 1 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 YTeucrium Limb of-the corolla irregular, seemingly bilabiate the 
upper lip either split down or very short. 
II. Ovary deeply 4-parted. 
TRIBE 11 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 +, 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 Meuissa 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 Ur 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 
cells 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. 
