76 



LABIATE. 



Physostegia. 



Tribe VII. S TA CHYDEsE. Benth. 



Calyx irregularly veined or 5 - 10-nerved, equal or rarely somewhat 2-lipped, 3 - 10-toothed. 

 Corolla 2-lipped : upper lip galeate or arched, entire or emarginate ; the lower variously 

 3-lobed. Stamens 4, ascending : upper pair shorter. 



CONSPECTUS OF THE GENERA. 



18. Physostegia. Calyx obscurely veined, 5-toothed, at length inflated-campanulate. Corolla with a long exserted 



tube ; the throat dilated. 



19. Lamfum. Calyx 5-nerved : teeth 5, not spiny. Upper lip of the corolla vaulted or galeate. Stamens longer than 



the tube. Achenia acutely 3-angled, truncate. 



20. Leonurus. Calyx 5-nerved, with five rigid somewhat spiny teeth. Upper lip of the corolla flattish or vaulted. 



Achenia sharply 3-angled, truncate. 



21. Galeopsfs. Calyx 5-nerved, with five mucronate teeth. Upper lip of the corolla arched : throat inflated. Anther- 



cells opening transversely by two valves. 



22. Stachys. Calyx mostly 10-nerved, 5-toothed. Corolla with the throat scarcely dilated : upper lip arched. Stamens 



longer than the tube. 



23. Marrdeium. Calyx tubular, 10-nerved, with 5 or 10 spreading teeth. Corolla with the tube longer than the calyx ; 



the upper lip straight, narrow, 2-cleft. Stamens included. 



18. PHYSOSTEGIA. Benth. Lab. p. 504. physostegia. 



[ From the Greek, physa, a bladder, and stegc, a covering ; the calyx becoming inflated.] 



Calyx obscurely 10-veined, 5-toothed or truncate and obscurely toothed, finally inflated- 

 campanulate. Corolla 2-lipped ; the tube much longer than the calyx, destitute of a ring 

 within ; the throat inflated : upper lip nearly erect, somewhat concave, entire or emarginate ; 

 the lower spreading, with 3 rounded lobes, of which the middle one is larger and emarginate. 

 Stamens ascending under the upper lip ; the lower pair rather longer : anthers parallel, 2- 

 celled ; the cells distinct. — Erect perennial herbs with lanceolate leaves, and the flowers 

 in a simple or compound terminal spike. Corolla large, purple. 



1. Physostegia Virginiana, Benth. Dragon s-head. 



Calyx acutely 5-toothed. — Benth. I.e.; Darlingt. fl. Cest. p. 603. Dracocephalum 

 Virginianum, Linn. sp. 2. p. 594 ; Michx. fl. 2. p. 10 ; Bot. mag. t. 467 ; Pursh, fl. 2. 

 p. 411 ; Ell. sk. 2. p. 84 ; Torr. compend. p. 236 ; Beck, bot. p. 278. D. denticulatum, 

 Ait. Kew. ed. 2. p. 317 ; Bot. mag. t. 214 ; Pursh, I. c. ; Ell. I. c. ; Beck, I. c. Prasium 

 purpureum, Walt. fl. Car. p. 166. 



Stem about 2 feet high, smooth, simple or sparingly branched. Leaves 2-3 inches long 

 and 4-8 lines wide, narrowly lanceolate, sessile, smooth, remotely and mucronately serrate. 

 Spikes leafless, 4-8 inches long ; the flowers mostly opposite and nearly sessile. Bracts 

 shorter than the calyx, ovate, acuminate. Calyx at first tubular- campanulate, but inflated 

 after flowering, pubescent, tinged with purple ; the teeth nearly equal. Corolla about three- 



