106 LABIATiS. 



Connsctiye joined to the filament by one end; only one anther cell..,. «. .l..,^...... 19 



§ 4. Stamens 4, perfect: corolla bilabiate: calyx 15 nerved. 



Flowers in oblong peduncled heads, pale violet: stamens exserted ...••.... 18 



§ 5. Stamens 4, perfect, ascending under the concave or hooded upper lip. 



Calyx with a projection on upper side: flowers solitary axillary 14 



Calyx purple-tinged, upper teeth broad, obtuse, lower two lanceolate 15 



Calyx 10- toothed, the shorter 5 teeth spiny, recurved: corolla small, white 16 



Calyx nearly equally 5- toothed: flowers in whorls or interrupted spikes , •• , 17 



1. TRICHOSTEMA, Gronovius. 



oblongrum, Benth. Corolla-tube shorter than the calyx. Or.-CaL 

 laxuxn, Gr. Diflfuse: leaves petioled: cymes peduncled, often forked, 

 lanceolatum, Benth. Gray-green: leaves crowded, sessile. Or.-CaL 

 ovatum, Curran. Leaves round-ovate: calyx densely villous. S. CaL 

 lanatuxn, Benth. Shrubby: leaves narrow: corolla woolly. Santa Barbara, £L 



2. MENTHA, LinnauB. 

 1. M, Canadensis, L. Villous: leaves oblong-ovate or narrower. 

 Var. g^labrata, Benth. The similar serrate acute leaves nearly glabrous, 



3. liYCOPTTS, Tournefort. 



1. Ij. Virginicus, L. Stem obtuse-angled: sterile filament minute. Or. 



2. li. lucidus, Turcz, var. Americanus, Gr. Stem acute -angled, stoat: nmiuin 

 tuberiferous: calyx-teeth slender, equaling corolla. 



3. Li. sinuatus. Ell. Leaves mostly incised or pinnatifid. N. CaL, Or. 



4. PYCNANTHEMUM, Michaux. 

 1. P. Califomicxini) Torr. Leaves ovate or narrower, sessile, 1-3 in. long. 



5. MONARDELLA, Bentham. 



^ 1. Calyx over ^ in. long: corolla-tube much longer than the lobes 1,3 



§ 2. Calyx ^.J in. long: corolla-tube but little longer than the linear or oblong flat lob«»j 

 flowers in dense involucrate heads. 



* Tufted', corolla Jlesh-color to rose^ lobes linear: calyx-teeth soft. 



Leaves ovate to lanceolate, petioled, pinnately veined: bracts obtuse 3, 4, 6 



Leaves linear to oblong, entire, ^-f in. long, upper subsessile 6, 7 



• • Annuals loosely branching: leaves entire or undulate^ rather distinct^ narrowed into a 



petiole: calyx-teeth unth margined n^nw- 

 iBraots ngidly cuspidate white and tr&iuiparenc except tn© veuuk (S, • 



