1. T 



2. T 



3. T 



4. T 



5. T 



106 LABIATiE. 



Connective joined to the filament by one end; only one anther cell 12 



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



Flowers in oblong peduncled heads, pale violet: stamens exserted 13 



§ 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.' 

 oblonguza, Benth. Corolla-tube shorter than the calyx. Or.-Cal. 

 laxum, Gr. Diffuse: 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. 

 lanatum, Benth Shrubby: leaves narrow : corolla woolly. Santa Barbara, S, 



2. MENTHA, Linnaeus. 

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

 Var. glabrata, Benth. The similar serrate acute leaves nearly glabrous. 



3. LYCOPTJS, Tournefort. 



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



2. Ii. lucidus, Turcz, var. Americanus, Gr. Stem acute-angled, stout; runners 

 tuberiferous: calyx-teeth glender, equaling corolla. 



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



V 



4. PYCNANTHEMUM, Michaux. 

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



5. MONABDELLA, Bentham. 



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



§ 2. Calyx J. J in. long: corolla-tube but little longer than the linear or oblong flat lobes: 



flowers in dense involucrate heads. 



* Tufted: corolla flesh-color to rose, lobes linear: calyx-teeth soft. 



Leaves ovate to lanceolate, petioled, pinnately veined: bra^s obtuse 3, 4, 5 



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



* * Annuals loosely branching: leaves entire or undulate, rather distinct, narrowed into a 



petiole: calyx-teeth with margined nerve. 

 Bracts n'gidly cuspidate white and transparent except tbe veto*. 8, 9 



