LABIATJE. (MINT FAMILY.) 405 



* Anthers more or less approximate in pairs; their cells divaricate or divergent ; filaments 



ascending, not exserted. 



23. Nepeta. Calyx more or less curved, equally 5-toothed. 



24. Dracocephalum. Calyx straight, the upper tooth much the larger. 



Tribe V. SCUTELXARINEvE. Stamens 4, ascending and parallel. Calyx bilabiate, 

 closed in fruit ; the rounded lips entire. Corolla bilabiate, the upper lip arched. 



25. Scutellaria. Calyx with a helmet-like projection on the upper side. 



Tribe VI. STACHYDE.E. Stamens 4, parallel and ascending under the galeate or 

 concave upper lip, the lower (outer) pair longer (except in n. 31, 32). Calyx 5-10- 

 nerved, not 2-lipped (except in n. 26). 



* Calyx reticulate-veiny, deeply bilabiate, closed in fruit. 



26. Brunella. Calyx nerved and veiny ; upper lip flat, 3-toothed, the lower 2-cleft. 



* * Calyx thin, inflated in fruit, obscurely nerved, 3 -5-lobed, open. 



27. Physostegia. Calyx 5-toothed or 5-lobed. Anther-cells parallel. 



28. Syiiandra. Calyx almost equally 4-lobed ! Anther-cells widely divergent. 



* * * Calyx of firmer texture, distinctly 5 - 10-nerved or striate, 5 - 10-toothed. 

 t- Stamens included in the short corolla-tube, its upper lip merely concave. 



29. Marrubium. Calyx tubular, 5 -10-nerved, and with 5 or 10 awl-shaped teeth. 



t- -i- Stamens ascending under the galeate upper lip of the corolla. 

 ** Stamens not deflexed after anthesis ; naturalized from the Old World. 



30. Ballota. Calyx somewhat funnel-form, expanding above into a spreading 5-toothed 



border. Nutlets roundish at top. Upper lip of the corolla erect. 



31. Plilomis. Calyx tubular, the 5 teeth abruptly awned. Upper lip of the corolla arched. 



32. Leonurus. Calyx top-shaped, the rigid spiny-pointed teeth soon spreading. Nutlets 



truncate and acutely 3-angled at top. Leaves cleft or incised. 



33. Lamium. Calyx-teeth not spiny-pointed. Nutlets sharply 3-angled, truncate. 



34. Galeopsis. Calyx tubular-bell-shaped ; the 5 teeth spiny-pointed. Anthers trans- 



versely 2-valved, the smaller valve ciliate. 



++ Stamens often deflexed or contorted after anthesis. 



85. Stachys. Calyx tubular-bell-shaped, equally 5-toothed or the 2 upper teeth united into 

 one. Nutlets rounded at top. 



1. TRICHOSTEMA, L. BLUE CURLS. 



Calyx bell-shaped, oblique, deeply 5-cleft ; the 3 upper teeth elongated and 

 partly united, the 2 lower very short. Corolla 5-lobed ; the lobes narrowly ob- 

 long, declined, nearly equal in length ; the 3 lower more or less united. Sta- 

 mens 4, with very long capillary filaments, exserted much beyond the corolla, 

 curved ; anther-cells divergent and at length confluent. Low annuals, some- 

 what clammy -glandular and balsamic, branched, with entire leaves, and mostly 

 solitary 1 -flowered pedicels terminating the branches, becoming lateral by the 

 production of axillary branchlets, and the flower appearing to be reversed, 

 namely, the short teeth of the calyx upward, etc. Corolla blue, varying to 

 pink, rarely white, small; in summer and autumn. (Name composed of 0p(, 

 hair, and o-r^/xa, stamen, from the capillary filaments.) 



1. T. dichotomum, L. (BASTARD PENNYROYAL.) Viscid with rather 

 minute pubescence ; leaves lance-oblong or rhombic-lanceolate, rarely lance-linear, 

 short-petioled. Sandy fields, E. Mass, to Ky., south to Fla. and Tex. 



2. T. lineare, Nutt. Pnberulent, more slender and less forked ; leaves 

 linear, nearly smooth. Conn, to La., near the coast; in sandy ground. 



