FLOWERING PLANTS AND FERNS OF ARIZONA 767 



1. Bouchea prismatica (Jacq.) Kuntze, Rev. Gen. PL 2: 502. 1891. 



Verbena prismatica J acq., Collect. 2: 301. 1788. 



Cochise and Santa Cruz Counties, 3,500 to 6,000 feet, infrequent 

 in rich shaded ground along: streams, August to October. Southern 

 Arizona, Mexico, and tropical America. 



The species is represented in Arizona by var. b re el rostra Grenze- 

 bach, with beaks of the nutlets very short. 



108. LABIATAE. Mint family 



Contributed by Carl Eplixg 



Plants herbaceous, annual or spreading; by rhizomes, less often 

 woody shrubs or undershrubs; stems herbaceous, usually square; 

 leaves opposite; flowers variously disposed; calyx commonly more or 

 less 2-lipped, the upper 3 teeth more or less joined, the lower pair 

 usually free, all sometimes equal, the tube sometimes enlarged in 

 fruit; corolla obscurely to (usually) evidently bilabiate, the upper 2 

 petals usually joined to form an erect, sometimes galeate lip enclosing 

 the stamens, or this sometimes very short and deeply notched, the 5 

 lobes rarely subequal, the lower lip usually spreading; stamens 4 or 



2, usually in 2 unequal pairs, the connective sometimes strongly 

 developed at the expense of the filament, the anthers parallel or di- 

 vergent, with 1 theca sometimes completely or partly aborted; style 

 bifid at apex, arising from the base of the 4-lobed ovary between the 

 quite distinct lobes, or from near the apex of the ovary when the lobes 

 (and the nutlets) are partly united below. 



An attractive family of largely aromatic plants, including such 

 notable contributions to the herb garden as mint, sage, lavender, 

 thyme, and rosemary. Nearly all of the Arizona Labiatae are good 

 honey plants. 



Key to the genera 



1. Functional stamens 2, with small staminodes sometimes also present (2). 

 2. Stamens appearing jointed, the connective strongly developed, often arcuate 

 and bearing fertile thecae at both ends, or straight and thrust down- 

 ward into the corolla tube, or the lower end wholly abortive; calyx 



teeth apparently 3 16. Salvia. 



2. Stamens not as in genus Salvia, both thecae fertile and approximate or con- 

 fluent (3). 

 3. Corolla nearly regular, small; flowers in axillary glomerules; herbage 



glabrous or merely puberulent 22. Lycopus. 



3. Corolla irregular, distinctly bilabiate (4). 



4. Flowers in dense subglobose verticils, these forming an interrupted spike, 

 or terminal, the glomerules subtended by numerous conspicuous 



bracts; leaves 3 to 8 cm. long or longer 17. Monarda. 



4. Flowers 1 to 6 (seldom more), in sessile or pedunculate axillary clusters, 



sometimes subtended by small bracteoles, the clusters never dense 



and subglobose; leaves rarely as long as 2 cm. (5). 



5. Stems ashy with small, curled or spreading, not at all feltlike hairs; 



calyx variously pubescent but not as in genus Poliomintha, the 



lower pair of teeth usually bristly with stiffish hairs along the 



margin 18. Hedeoma. 



5. Stems whitened with a dense feltlike tomentum; calyx softly and 

 densely hairy with hairs as long as the calyx teeth. 



19. POLIOMIXTHA. 



286744° 42 49 



