POPULAR FLORA. 179 
* * * Stamens 4 or 2, not turned down, and not protruding from the upper side of the flower. 
Corolla scarcely at all two-lipped, almost equally 4-lobed. Flowers small. 
Stamens 4 with anthers, almost equal in length, (Mentha) Mint. 
Stamens only 2 with anthers. Flowers in dense axillary whorls, (Lycopus) WATER-HoREHOUND. 
Corolla evidently 2-lipped: stamens 2, or only 2 with anthers. 
Upper lip nearly flat or spreading, 2-lobed or notched at, the end. 
Calyx equally 5-toothed, bearded in the throat. Cymes terminal, (Cuntla) Dirtany. 
Calyx 2-lipped: upper lip 3-toothed, the lower 2-cleft. Z 
Throat of the calyx bearded: corolla small: 2 sterilefilaments, (Hedéoma) PENNYROYAL. 
Throat of the calyx naked; that of the large corolla bearded; the middle 
lobe of its lower lip large and hanging, fringe-toothed, ( Collinsdnia) Horse-BaLa. 
Upper lip of the corolla arched, entire or slightly notched, holding the stamens. 
Calyx equally 5-toothed, tubular: lips of the large corolla long and narrow. 
Flowers crowded in close and leafy-bracted heads, ( Mondrda) Horsx-Mint. 
Calyx 2-lipped. 
Upper lip with 3 bristle-pointed teeth. Flowers in heads, (Blephilia) Burrnrira. 
Upper lip entire or 3-toothed. Anthers with only one cell, on the end of a 
long connective astride the end of the filament, (Sdlvia) Sac. 
Corolla 2-lipped: stamens 4, all with anthers. 
Upper and inner pair of stamens longer than the lower or outer pair, 
And curved downwards. Flowers spiked, small. Herbs tall, (Zophdnthus) GiaNt-Hyssor. 
Both pairs of stamens ascending under the upper lip. 
Flowers in terminal spikes or clusters, (Népeta) Carnip. 
Flowers few in the axils of kidney-shaped leaves, (Glechima) Grounp-Ivy. 
Upper pair of stamens shorter than the lower or outer pair. 
Upper lip of the corolla flat and open, or barely concave. 
Stamens distant or diverging, not approaching under the upper lip. 
Calyx tubular, equally 5-toothed, 15-nerved. Stamens long, (Hyssopus) *Hyssor. 
Calyx 10 to 13-nerved, ovate, bell-shaped, or short tubular. : 
Calyx naked in the throat. 
Flowers in dense heads or clusters, (Pycnénthemum) Mountarn-Minr. 
Flowers clustered in the axils or spiked, (Satureia) *SuMMER-Savory. 
Calyx hairy in the throat. 
Flowers spiked, and with large colored bracts, (Origanum) MargoraM. 
Flowers loosely clustered: bracts minute, (Thymus) *THyMx. 
Stamens with their anthers approaching in pairs under the upper lip. ‘ 
Calyx tubular. Flowers in « head-like cluster, surrounded with awl- 
shaped bracts, ( Clinopodium) Bast. 
Calyx tubular-bell-shaped and 2-lipped: corolla curved upwards. 
Flowers few in loose clusters, (Melissa) *BaLM. 
Upper lip of the corolla concave, the whole throat inflated and funnel-shaped. 
Flowers Jarge in naked spikes, (Physostégia) FALSE-DRAGONHEAD. 
Upper lip of the corolla arched or hood-like. 
Calyx 2-lipped, closed over the fruit, and 
Very veiny, the lips toothed: flowers in a bracted short spike,  (Brundlla) Srur-1wav. 
Not veiny, becoming helmet-shaped; lips entire, Scutellaria) Scuticar. 
