Labiatae 799 



Calyx nearly regular; corolla about 5 mm long; stamens scarcely exceeding the 



corolla; seed slightly pubescent at the summit 7217. Isanthus, p. 801. 



Calyx strongly 2-lipped, the two lower teeth not reaching the base of the 3 upper 

 teeth; corolla more than 5 mm long; stamens exserted; seed glabrous at the 



summit 7218. Trichostema, p. 801. 



A. Ovary of 4 distinct or nearly distinct nutlets; nutlets basally attached; styles basal. 

 Calyx 2-lipped, gibbous at the base, both lips entire, not hairy in the throat; 



stamens 4 7234. Scutellaria, p. 802. 



Calyx either 2-lipped or regular, 4- or 5-toothed, if gibbous at the base, then hairy in 

 the throat (Hedeoma). 

 Stamens and style included in the corolla tube; calyx teeth aristate and recurved; 



flowers in dense axillary clusters 7238. Marrubium, p. 806. 



Stamens and style not included in the corolla tube. 

 B. Upper lip of corolla concave. 

 Anther-bearing stamens 4. 



Stamens strongly exserted beyond the corolla; tall, coarse herbs; inflores- 

 cence of long and usually dense, terminal spikes 



7241. Agastache, p. 806. 



Stamens not exserted beyond the corolla. 



Stems generally 0.5-1.5 m tall; leaves usually 7-15 cm long and 1.5-3 cm 

 wide, sharply and coarsely serrate; inflorescence of closely flowered, 



long, terminal spikes; flowers purplish, mostly 15-25 mm long 



7257. Physostegia, p. 808. 



Stems, leaves, and inflorescence not as above. 



Plants low and diffuse, stoloniferous, or creeping and rooting at the 

 nodes; at least the lower leaves petioled and cordate. 

 Flowers axillary, generally 1-3 in an axil; leaves reniform; petioles of 



about equal length 7249. Glecoma, p. 807. 



Flowers, leaves, and petioles not as above. 



Calyx 15-nerved; flowers large, usually 2-3.5 cm long 



7243. Meehania, p. 807. 



Calyx about 5-nerved; flowers usually less than 2 cm long 



7271. Lamium, p. 810. 



Plants not as above. 



Corolla generally 3-4 cm long, colorless or greenish yellow; leaves on 



long petioles, cordate at the base 7259. Synandra, p. 809. 



Corolla less than 2.5 cm long, usually pinkish or purplish; leaves 

 rarely cordate at the base. 

 Plants canescent-pubescent; under surface of leaves velvety to the 



touch 7247. Nepeta, p. 807. 



Plants not as above. 



Calyx teeth rigid and spine-tipped, spreading at maturity. 



Leaves pinnately crenate 7270. Galeopsis, p. 809. 



Leaves incised or lobed 7273. Leonurus, p. 810. 



Calyx teeth not rigid and spine-tipped; erect at maturity. 



Calyx closed in fruit; bracts large, ovate-orbicular 



7254. Prunella, p. 808. 



Calyx not closed in fruit; bracts not as above 



7281. Stachys, p. 810. 



Anther-bearing stamens 2. 



Calyx regular, 15-ribbed, generally hairy in the throat 



7296. Monarda, p. 814. 



Calyx 2-lipped, 12-13-ribbed, not hairy within the throat. 



Teeth of the calyx of our species not equal; bracts not ciliate with long 



hairs 7290. Salvia, p. 813. 



Teeth of the calyx equal; bracts ciliate with long hairs 



7297. Blephilia, p. 816. 



