MINT FAMILY 209 
1. C. americana L. Frencn Mutperry, Mexican Mutperry. 
Shrubs, with star-shaped glandular or scurfy down, widely branched, 
3-8 ft. high. Leaves ovate to oblong, acute at each end, crenate- 
serrate, rough above, downy beneath, glandular-dotted ; petioles slen- 
der. Cymes many-flowered, the peduncle as long as the petiole; 
pedicels short. Calyx cup-shaped, the teeth short. Corolla double 
the length of the calyx, blue. Fruit violet-purple, very conspicuous 
in autumn. Common in fields and thickets 8.* 
88. LABIATZ. Mint Famity 
Mostly herbs, with square stems and opposite, mcre or less 
aromatic, leaves, without stipules. Flowers generally in cyme- 
like axillary clusters, which are often grouped into terminal 
spikes or racemes. Calyx tubular, usually 2-lipped, persistent. 
Corolla usually 2-lipped. Stamens 4 (2 long and 2 short) or 
only 2. Ovary free, with 4 deep lobes, which surround the 
base of the style. Fruit consisting of 4 nutlets, ripening 
inside the base of the calyx. 
Stamens 4. A 
(a) Calyx 2-lipped. 
Lips entire. Scutellaria, I 
Lips toothed and cleft. Plants not aromatic. Prunella, IV 
Lips toothed and cleft. Plants aromatic. Leaves extremely 
small. Thymus, IX 
(6) Calyx not 2-lipped, or not much so. 
Calyx tubular, 5-10-toothed. Stamens not projecting from 
tube of corolla. Marrubium, IT 
Calyx tubular, with 5 equal teeth. Stamens under upper 
lip of corolla. Nepeta, ITI 
Calyx tubular, bell-shaped, with 5 awl-shaped teeth. Stamens 
not turned down after maturing. Lamium, V 
Calyx top-shaped, with spreading spiny teeth. Leonurus, VI 
Calyx as in V. Stamens turned down after maturing. 
Stachys, VII 
B 
Stamens 2. Salvia, VIII 
