292 LABIATE (MINT FAMILY.) 



1. L. CUneifolia, Steud. Diffusely branched, procumbent {not creeping), 

 minutely canescent throughout : leaves rigid, cuneate-linear, sessile, incisely 

 2 to ^-toothed above the middle: peduncles mostly shorter than the leaves: bracts 

 rigid, broadly cuneate, abruptly acuminate from the truncate or retuse dilated 

 summit: calyx-lobes emarginate : corolla white (?). — On the plains from 

 Nebraska to New Mexico and Arizona. 



2. L. lanceolata, Michx. Creeping extensively, some branches ascend- 

 ing, minutely and sparsely strigulose: leaves thinner, varying from obovate 

 and lanceolate-spatulate to ovate, narrowed, at base mostly into a petiole, above 

 sharply serrate: peduncles much exceeding the leaves: bracts mucronate or 

 pointless : calyx-lobes linear-lanceolate : corolla bluish-white. — From E. 

 Colorado and Texas to Pennsylvania and Florida. 



Order 60. IiABIATJE. (Mint Family.) 



Chiefly herbs, with aromatic foliage, square stems, opposite leaves, 

 more or less bilabiate corolla, didynamous or diandrous stamens, and a 

 deeply 4-lobed ovary, which forms in fruit 4 seed-like nutlets, surround- 

 ing the base of the single style. — Upper lip of the corolla 2-lobed or 

 entire: the lower 3-lobed. Stamens inserted on the tube of the corolla. 

 Style 2-lobed at apex. Flowers axillary, chiefly in cyinose clusters, 

 these often aggregated in terminal spikes or racemes. 



Tribe I. Stamens 4, ascending, mostly exserted from the upper side of the corolla : calyx 

 5 to 10-nerved. — Ajugoide^e. 



1. 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. Stamens exserted from the cleft: anthers confidently one-celled. 



Tribe II. Stamens not declined ; the posterior pair shorter or wanting ; anthers 2-celled ; 

 the cells distinct or confluent, short : corolla less strongly bilabiate and the lobes Hat- 

 ter than in succeeding tribes ; upper lip not galeate or concave. 



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



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

 capitate-glomerate, and the clusters sometimes confluent- spiked. 



2. Mentha. Stamens 4, similar and nearly equal. Calyx 5-toothed. Upper lobe of 



corolla sometimes emarginate. 



3. Lycopus. Stamens only 2 with anthers; the upper pair sterile rudiments, or else 



wanting. Calyx 4 to 5-toothed, naked in the throat. Upper lobe of corolla 

 entire. 



* * Corolla more or less evidently bilabiate ; the upper lip erect, entire or emarginate, or 



2-cleft in No. 5; the lower spreading and 3-cleft. 

 -t- Stamens 4, didynamous, distant and straight, often divergent, never convergent nor 

 curved : calyx 10 to 15-nerved : flowers capitate-verticillastrate, or sometimes 

 sparser. 



4. Pycnanthemum. Calyx ovate-oblong or tubular; the 5 teeth equal, or the 3 upper 



more or less united. Corolla with entire or barely emarginate upper lip, and 3-eleft 

 lower one. Stamens little unequal : anther-cells parallel. 

 6. Monartlella. Calyx tabular, narrow ; the 5 teeth equal or nearly so. Corolla with 

 2-cleft upper lip, and 3-parted lower one. Stamens strongly or moderately unequal, 

 exserted : anther-cells often divergent or divaricate. Flowers densely capitate- 

 Vf.j-ticUloatrate. 



