408 FLORA OF TEXAS. 



lower pair longer, reclining on the lower lobe of the corolla. 

 Anthers 2-celled. Nutlets smooth, distinct. 



Calyx-teeth nearly equal. Lowest lobes of the corolla longest, saccate, bent downward. 



Htptis. 



Tribe II. Satureiae. Stamens 2 or 4, straight and 

 spreading, or conniveDt under the upper lip; the upper 

 pair shorter or abortive. Anthers 2-celled. Niitlets 

 smooth, distinct. 



* Corolla-lobes nearly equal. Stamens distinct. 



Fertile stamens i. Whorls spiked. Xutlets obtuse Mentha. 



'- 2. axillary. truncate LtcopiTS. 



** Corolla 2'lipped. Stamens straight, distinct, spreading. 



Stamens 4. Calyx 2-lipped or ^toothed, naked in the throat PrcNANTHZinTM. 



2 or 4. ; upper lip truncate, 3-toothed. Corolla fimbriate. 



COLLUiSONIA. 



*** Corolla 2-lipped. Stamens ascending and spreading above, or connivent under the 

 upper lip. 



T Fertile stamens i. Calyx 13-nerved. 



Calyx 2-lipped. Flowers in cymes. Anthers aumless. Chiefly shrubs... CjujmiXTBJi. 



Anther-cells awned. Brandling annuals Diceraxd&a. 



Tribe III. Monardeae. Stamens 2, ascending and 

 parallel. Anthers 1-celled, or with 2 confluent cells. 

 Calyx and corolla 2-lipped. Nutlets smooth, distinct. 



Connective of the anther elongated, oblique ; the upper cell fertile, the lower abortive or 



waiiting Sajlvia. 



Anthers 2<elled, the cells confluent. Calyx-teeth equal Mokabda. 



2-lipped, upper teeth aum«d.... Bi£PHrLiA. 



Tribe IV. Nepeteae. Stamens 4, the upper pair 

 longer. Nutlets smooth, distinct. 



stamens all ascending. Anther-cells parallel Cedboxzixa. 



Tribe Y. Stachydeae. Stamens 4, the lower pair 

 longer, parallel, ascending. Upper lip of the corolla concave 

 or keeled. Calijx 3-10-toothed or lobed. Nutlets smooth, 

 distinct. 



