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PHARMACOGNOSY. 
ovate, opposite, 1'5 to 6 cm. long, 8 to 25 mm. broad ; 
apex obtuse; base acute or rounded; margin coarsely 
crenate ; upper surface dark green, pubescent, veins de- 
pressed, those of the first order diverging at an angle 
of about 65° and branching near the margin ; under 
surface grayish green, very pubescent, veins promi- 
nent; petiole 05 to 3 cm. long, very pubescent. Flow- 
ers sessile, in axillary clusters ; calyx tubular, about 5 
mm. long, five to ten-nerved, very pubescent and with 
ten recurved bristle-like lobes ; corolla whitish or light 
brown, about 7 mm. long, upper lip erect, entire or 
bifid, lower lip three-lobed, the middle lobe the largest 
and emarginate; stamens four, included. Nutlets brown- 
ish black, ellipsoidal, slightly compressed, about T5 
mm. long, nearly smooth. Odor slight, aromatic. 
Taste aromatic and bitter. 
Constituents. — Volatile oil; a bitter crystalline 
principle marrubiin ; resin and tannin. 
HEDEOMA (American Pennyroyal). 
The leaves and flowering tops of Hedeoma pulegioides 
(Fam. Labiatse), an annual herb indigenous to the East- 
ern and Central United States and Canada. Penny- 
royal should be collected in July or August and 
dried. 
Description. — Stem quadrangular, 1 to 2 mm. in 
diameter, light or reddish brown, with numerous 
spreading hairs. Leaves elliptical or ovate, opposite, 15 
to 35 mm. long, 5 to 14 mm. broad; apex obtuse; base 
tapering into the petiole; margin remotely serrate; 
upper surface dark green, pubescent on the nerves, 
slightly glandular-hairy; under surface light green, 
pubescent, glandular-hairy, veins of the first order 
diverging at an angle of 45° to 65°, curving upwards 
and uniting near the margin; petiole 3 to 6 mm. longj 
