LABIATAE MOTHERWORT 711 



Fig. 410. Ground Ivy (Nepeta hederacea). A 

 somewhat weedy plant, naturalized from Europe. 

 Said to be poisonous to horses. (From Johnson's 

 Med. Bot. of N. A.). 



2. Hedeoma Pers. 



Aromatic, pungent herbs; leaves small; flowers in axillary clusters, crowd- 

 ed into terminal spikes or racemes ; calyx ovoid or tubular, bearded in the 

 throat, 2-lipped; the upper lip toothed; corolla 2-lipped, the upper 2-lobed, the 

 lower spreading, 3-cleft; fertile stamens, 2; the upper pair reduced to sterile 

 filaments or wanting; nutlets ovoid, smooth. 



Hedeoma pulegioides Pers. American Pennyroyal 



An erect, branching, hairy annual; leaves ovate to ovate-oblong, petioled, 

 sparingly serrate ; whorls few flowered ; upper calyx teeth triangular, gibbous ; 

 corolla bluish; rudimentary stamens, evident but not usually anther-bearing. 



Poisonous properties. It has been regarded with suspicion. It has the odor 

 and taste of true Pennyroyal. Hedeoma pulegioides contains a volatile oil, 

 hedeomol C 10 H lg O. 



Leonurus L. Motherwort 



Tall herbs with palmately cleft or dentate leaves; flowers small, white or 

 blue, in axillary clusters ; calyx tubular, 5-nerved and 5 rigid teeth ; corolla 

 2-lipped. About 10 species in the old world. 



Leonurus Cardiaca L. Motherwort 

 Tall perennial herb with erect stem, 2-6 feet high; leaves long petioled, the 



