Class XIV. Order I. 237 



Smaller than the preceding. Stem branched and of uniform 

 thickness. Leaves ovate-lanceolate, entire or serrate, marked 

 with deep veins. Calyx hairy with prickly teeth. Corolla 

 variable, red, white, or variegated. On Chelsea beach. July. 

 Annual. 



243. BALLOTA. 



BALLOTA NIGRA. L. Black Horehound. 



Leaves ovate, undivided, serrate ; calyx dilated 

 above, subtrimcate, with spreading teeth. 



Two or three feet high and universally pubescent. Leaves 

 ovate, a little cordate. Whorls axillary. Calyx infundibuli- 

 form, ten ribbed. Corolla purple or white. At Hull. July. 

 Perennial. 



244. NEPETA. 



NEPETA CATARIA. L* Catmint or Catnep. 



Flowers spiked ; the whorls slightly peduncnlated. 



Leaves on footstalks, heart shaped, tooth serrated. Sm. 



This well known plant grows every where in dry soils, 

 about fences and buildings. Its name is derived from the great 

 partiality of cats for the odour of the plant. Stem two or three 

 feet high, square and downy. Leaves long-heart shaped, ser- 

 rate, pale underneath, covered with soft down. Calyx ribbed- 

 Corolla tubular, upper lip straight, lower lip with the middle 

 lobe spreading, crenate, elegantly dotted. July. Perennial. 



245. BRACHYSTEMUM. 

 BRACHYSTEMUM VIRGINICUM. Mich. Virginia Thymr. 



Stem erect, somewhat pubescent ; leaves lanceolate 

 or linear, entire, smooth ; heads somewhat fascicled. 

 Mich. abr. 



Stjii. THTMUS VIKGINICUS. L. 



An erect plant with fastigiate branches. Stem square, downy 

 at the angles. Leaves opposite, rigid, very narrow, rounded at 

 base, and tapering to a long, acute point. Under a magnifier 

 they appear covered with fine, black dots. Flowers in numer- 



