LABIATE. (MINT FAMILY.) 409 



9. GUN I LA, L. DITTANY. 



Calyx ovate tubular, equally 5-toothed, very hairy in the throat. Corolla 2- 

 lipped ; upper lip erect, flattish, mostly notched ; the lower spreading, 3-cleft. 

 Stamens 2, erect, exserted, distant ; sterile filaments short, minute. Peren- 

 nials, with small white or purplish flowers, in corymbed cymes or clusters. 

 (An ancient Latin name, of unknown origin.) 



1. C. Mariana, L. (COMMON DITTANY.) Stems tufted, corymbosely 

 much branched (1 high); leaves smooth, ovate, serrate, rounded or heart- 

 shaped at base, nearly sessile, dotted (!' long) ; cymes peduncled; calyx stri- 

 ate. Dry hills, southern N. Y. to S. Ind., south to Ga. and Ark. 



10. HYSSOPUS, Tourn. HYSSOP. 



Calyx tubular, 15-nerved, equally 5-toothed, naked in the throat. Corolla 

 short, 2-lipped ; upper lip erect, flat, obscurely notched, the lower 3-cleft, with 

 the middle lobe larger and 2-cleft. Stamens 4, exserted, diverging. Peren- 

 nial herb, witli wand-like simple branches, lanceolate or linear entire leaves, and 

 blue-purple flowers in small clusters, crowded in a spike. (The ancient name.) 



H. OFFICIN.XLIS, L. Roadsides, etc., sparingly escaped from gardens. 

 (Adv. from Eu.) 



11. PYCNANTHEMUM, Michx. MOUNTAIN MINT. BASIL. 



Calyx ovate-oblong or tubular, about 13-uerved, equally 5-toothed, or the 

 three upper teeth more or less united, naked in the throat. Corolla short, 

 more or less 2-lipped ; the upper lip straight, nearly flat, entire or slightlv 

 notched ; the lower 3-cleft, its lobes all ovate and obtuse. Stamens 4, distant, 

 the lower pair rather longer ; anther-cells parallel. Perennial upright herbs, 

 with a pungent mint-like flavor, corymbosely branched above, the floral leaves 

 often whitened ; the many-flowered whorls dense, crowded witli bracts, and 

 usually forming terminal heads or close cymes. Corolla whitish or purplish, 

 the lips mostly dotted with purple. Fl. summer and early autumn. Varies, 

 like the Mints, with the stamens exserted or included in different flowers. 

 (Name composed of irvici>6s, dense, and a.vQefj.oi', a blossom, from the dense 

 inflorescence.) 



* Bracts and equal calyx-teeth awn-tipped, rigid, naked, as long as the corolla ; 

 Jlowers in rather dense mostly terminal heads ; leaves rigid, slightly petioled. 



1. P. aristatum, Michx. Minutely hoary-puberulent (1-2 high) ; 

 leaves ovate-oblong and oblong-lanceolate, acute, sparingly denticulate-serrate 

 (1 -2' long), roundish at the base. Pine barrens, N. J. to Fla. and La. 



Var. hyssopifolium, Gray. Leaves narrowly oblong or broadly linear, 

 nearly entire and obtuse. Va. to Fla. 



* * Bracts and equal and similar calyx-teeth not awned. 



*- Leaves linear or lanceolate, nearly sessile, entire, very numerous; capitate 

 glomerules small and numerous, densely cymose, imbricated with many short 

 oppressed rigid bracts. 



2. P. lanceolatum, Pursh. Smoothish or minutely pubescent (2 high); 

 leaves lanceolate or lance-linear, obtuse at base ; heads downy ; bracts ovate or 

 lanceolate; cali/x-teeth short and triangular. Dry thickets, Mass, to Dak., 

 south to Ga. and Ark. 



