286 LABIATE. 



* * Calyx regular; corolla pronouncedly but not strongly bilabiate. 



Flowers densely glomerate terminally and in the upper axils; 



calyx short-tubular; corolla lobes short KCELLIA 4 



Flowers in a simple terminal bracted flat-topped head MONARDELLA 5 



Fowers 1 or 2 only in each axil; 



Stems slender, prostrate MICROMERIA 6 



" shrubby, erect SPHACELE 10 



* * * Calyx regular; corolla strongly bilabiate. 



CJalyx with 10 spinescent teeth, some of them hooked MARRUBIUM 16 



Calyx with 5 more or less spinescent teeth; 



Nutlets with truncate'summit LAMIUM 17 



" with rounded summit STACHYS 18 



* * * * Both calyx and corolla bilabiate, the latter strongly so. 



Flowers few in each leaf-axil; 



Calyx oblong-campanulate, flattened on the back MELISSA 7 



closed in fruit, and with a casque-like projection on 



the back SCUTELLARIA 14 



Flowers densely verticillastrate; 



Verticillasters forming a close spike or thyrse; 



Upper calyx-lip truncate, 3-toothed BRUNELLA 15 



Calyx oblique at the throat; teeth subequal NEPETA 13 



" strongly ciliate, deeply and unequally 5-clef t POGOGYNE 8 



Verticillasters more remote; 



Subtended by prickly-margined bracts ACANTHOMINTHA 9 



Anthers with long filament-like connective, 1 cell at each 

 end, or 1 end with no cell; 



Upper lip of corolla manifebt SAL VIA 11 



" " obsolete EAMONA 12 



1. TRICHOSTEMA, Gronov. Herbs, ours annual, with a very keen 

 somewhat acid smell, and blue flowers in axillary cymes. Calyx 5-clef t. 

 Corolla with narrow tube and more or less oblique limb; the somewhat 

 similar lobes oblong. Stamens with capillary filament very long 

 exserted and curved, didynamous; anther-cells divaricate or divergent. 



1. T. laxum, Gray. Diffusely branching, 1 2 ft. high, minutely 

 pubescent, sparsely leafy: leaves lanceolate or oblong-lanceolate, acumi- 

 nate but obtusish, 23 in. long, nervose-costate, rather slender-petioled: 

 cymes pedunculate, loose: tube of corolla about 3 and limb 2 lines long. 

 From Sonoma Co. northward. July Oct. 



2. T. lanceolatum, Gray. Tall as the last, rather strict and simple, 

 only a few ascending branches from the base: herbage pale with a dense 

 pubescence: leaves crowded, costate-nerved, lanceolate or ovate-lanceolate, 

 tapering from near the broad base to a very acute tip: cymes short-pedun- 

 cled, dense: calyx villous: corolla somewhat pubescent. Livermore 

 Valley, and northward and southward, towards the interior. June Oct, 



2. MENTHA, Pliny (MINT). Fragrant perennial herbs, mostly 

 spreading by slender creeping rootstocks. Calyx short, 5-toothed, 



