278 SYSTEMATIC BOTANY. 



per lip flat, erect ; lower lip spreading, 3-lobed ; lobes nearly equal. 

 Stamens 2, sometimes accompanied by 2 sterile filaments. 



H. PULEGIOIDES (Pennyroyal}. Stem erect, branching ; leaves ovate, 

 or oblong-ovate, few-toothed, on short petioles, smooth above ; flowers small, 

 pale purple, in whorls ; corolla pubescent. In dry, barren fields, 3'-8' high. 

 July-September. 



11. Melissa. Calyx 13-ribbed, flattish above ; upper lip 3-toothed ; 

 lower lip 2-toothed. Corolla bilabiate ; upper lip erect, flattish ; lower 

 lip spreading, 3-lobed ; middle lobe broadest. Stamens ascending, y. 



M. OFFICINALIS (Balm). Stem erect, branching ; leaves ovate, acute, 

 coarsely toothed ; flowers in half whorls, white or yellow ; bracts few, ovate- 

 lanceolate, petiolate. June-August. 



12. Scutellaria. Calyx campanulate, bilabiate ; lips entire ; up- 

 per sepal arched. Corolla bilabiate, with the tube elongated ; upper 

 lip arched, entire ; lower lip with its middle lobe dilated and convex. 

 Stamens 4, ascending beneath the upper lip. Anthers approximate in 

 pairs, ciliate. of 



1. S. GALERICULATA (Common Skullcap). Stem simple or slightly 

 branched ; leaves all alike, ovate, or ovate-lanceolate, acute, serrate, more or 

 less cordate at base, on very short petioles, almost sessile ; flowers large, axil- 

 lary, usually solitary ; corolla blue, greatly expanded above. In swamps and 

 meadows, 1-2 feet high. August. 



2. S. LATERIFLORA (Side-flowering Skullcap} . Stem erect, with oppo- 

 site branches ; leaves ovate-lanceolate ; lower floral leaves resembling the 

 others ; upper floral leaves small, resembling bracts ; flowers small, in lateral, 

 axillary, leafy, long-peduncled, somewhat one-sided racemes ; corolla blue. 

 In meadows and low grounds, io'-i8' high. July-August. 



13. Brunella. Calyx tubular campanulate, bilabiate, closed in 

 fruit ; upper lip broad and flat, with 3 short teeth ; lower with 2 lanceo- 

 late teeth. Corolla bilabiate ; upper lip vaulted, erect, entire ; lower 

 lip spreading, reflexed, 3-cleft. Stamens 4. Filaments forked, the 

 lower division bearing the anther, y. 



P. VWLG\RI$ (Self-heal). Stem low, simple, or slightly branched, marked 

 with pubescent lines ; leaves oblong-ovate, entire, or slightly toothed, petio- 

 late ; flowers in dense, sessile, bracted, 5-6-flowered verticils, forming a dense, 

 terminal spike ; bracts reniform, 2 to each verticil, membranous, ciliate ; co- 

 rolla blue or violet of various shades. In meadows, 6'-i2' high. June- 

 August. 



14. Nepeta. Calyx tubular, obliquely 5-toothed. Corolla naked 

 and expanded at the throat, bilabiate ; upper lip erect, emarginate ; 

 lower lip spreading, y-cleft. Stamens 4, approximate in pairs, y. 



i. N. CATARIA (Catnip). Stem tall, erect, branching ; leaves cordate, 

 trenate, soft and velvety ; flowers in slightly pedunculate whorls, arranged 



