MOXOPETALOUS EXOGENOUS PLANTS. 405 



lobes tootlied, narrowed into a slender petiole, the loAver 

 ones smaller, rounded, toothed; spikes terminal and in the 

 forks of the stem, long-peduncled, closely flowered; calyx 

 long, slender, the unequal teeth subulate; corolla showy, 

 purple. Stem 6-12' high ; corolla f long. 



** Anthers without appendages ; flowers small. 

 t Leaves undivided. 



V. URTiciFOLiA, L. Kough-hairy; 5^em tall, branching; 

 leaves ovate-oblong, acute or acuminate, mucronate-serrate, 

 contracted at the base into a long petiole ; spikes very long, 

 filiform, axillary and terminal ; flowers minute, white or 

 pale blue. Low ground. Stem 2°-5° high; leaves very 

 rough, 2-6' long. 



V. HASTATA, L. Eough-hairy; stem branching; leaves 

 oblong-lanceolate, acuminate, coarsely and sharply serrate, 

 tapering into a long petiole, the lowest broader, and often 

 hastate-lobed at the base ; spikes linear, short, close-flow- 

 ered ; flowers violet. (V. paniculate. Lam.) Low ground. 

 Stem 2°-3° high ; flowers larger than in V. urticifolia. 



V. ANGUSTIFOLIA, Michx. Rough-hairy ; stem simple or 

 branched above ; leaves lanceolate or linear-lanceolate, ra- 

 ther obtuse, coarsely serrate, tapering from near the apex 

 to the sessile base ; spikes linear, terminal, close-flowered ; 

 floioers purple. Dry woods. Stern 6'-12' high ; flowering 

 spikes 2 '-3' long. 



LIPPIA, L. 



Herhs, with 4-angled stems, opposite or whorled, simple 

 leaves ; flowers in dense spikes or heads; calyx tubular, 

 membranaceous, 2-4 - toothed ; corolla tubular-funnel- 

 formed, somewhat bilabiate, 5-cleft; stamens 4, didyna- 

 mous, included ; ovary 2-celled, 2-ovuled; style short; stig- 

 ma obliquely capitate; fruit of two 1-seeded separable 

 nutlets. 



