FLOKA OF THE DISTRICT OF COLUMBIA. 241 



Inflorescence a more or less interrupted spike. 

 Flowers either nearly regular or seemingly 1-lipped. 



Spikes thick; flowers large, seemingly 1-lipped 2. TETJCBHTM. 



Spikes slender; flowers small, nearly regular 24. MENTHA. 



Flowers distinctly 2-lipped. 



Plants pmple or purplish green 26. PESILLA . 



Plants green, not purplish. 



Calyx distinctly 2-lipped 15. SALVIA. 



Calyx nearly regular. 

 Plants white-hairy or canescent. 



Flowers large, bright blue 1. AJTJGA. 



Flowers small, white or purplish 8. NEPETA. 



Plants puberulent, pubescent, or hirsute, but not whitened. 

 Leaves narrowly lanceolate, merely puberulent; spikes rather 



loosely flowered, continuous 11. DRACOCEPHALUM. 



Leaves broader, conspicuously pubescent or hirsute; spikes composed 

 of interrupted whorls 14. STACHYS . 



1. AJFGA L. 

 1. Ajuga genevensis L. Bugleweed. 



Established in a pasture near Maryland Agricultural College. July. Native of 

 Eur.; locally established in the middle coastal states. 



2. TETJCBIUM L. 

 1. Teucrium canadense L. Wood-sage. 



Rich low ground. July- Aug. Eastern U. S. 



3. ISANTHUS Michx. 



1. Isanthus brachiatus (L). B. S. P. False pennyroyal. 



Collected only once, "Flats below mill," Aug. 12, 1877 (Ward). Eastern N. Amer. 

 (J. coeruleus Michx.) 



4. TEICHOSTEMA L. 



1. Trichostema dichotomum L. Bluecurls. 



Dry fields throughout the region. Sept.-Oct. Eastern N. Amer. 

 The common name is not strictly applicable, for a pink-flowered form is fairly 

 common. 



T. lineare Walt, is reported in Brereton's Prodromus. 



6. SCTJTELLAEIA L. Skullcap, 



Flowers solitary, axillary, less than 10 mm. long. 

 Leaves on the middle of the stem broadly ovate, usually dentate, 2^.5 cm. long; 



nutlets slender-stalked, conspicuously winged 1. S. nervosa. 



Leaves on the middle of the stem narrowly ovate or lanceolate, entire or nearly 



eo, less than 2 cm. long; nutlets short-stalked, wingless 2. S. parvula. 



Flowers in racemes or panicles or, if occasionally solitary, more than 15 mm. long. 

 Stem leaves all rounded or cordate at the base. 



Flowers 5-8 mm. long, in one-sided racemes 3. S. lateriflora. 



Flowers 12-15 mm. long, not in one-sided racemes. 



Plants glabrous; leaves thin, not veiny 4. S. saxatilis. 



Plants soft-hairy; leaves thick, veiny, rugose 6. S. ovata. 



Stem leayes, at least some of them, acute to acuminate at the base. 

 Stem leaves, except the lowest, entire 6. S. integrifolia. 



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