LABIAIVK. (mint FAMILY.) 11 H 



their cells diverging. — Low perennials, with nearly Hiniplc stem.s and 3-flow. 

 cred clusters of flowers sessile in the axils of round and br.ict-Iiko memhra- 

 naceous floral leaves, imbricated in a close spike or head. (Xaino naid to 1»c 

 from the German braune, a disease of the throat, for wliich this j)l;int w:is a 

 re|)nted reniedx.) 



1. B. vulgaris, L. (Common Sulf-heal or IIkal-all.) I.cavo.-% ovate- 

 uhlong, entire or toothed, petioled, hairy or snioothish ; corolla (violet or flesh- 

 color, rarely white) not twice the length of the purplish calyx, — Woods and 

 flelds, Newf. to Fla., westward across the continent. 'June -Sept. (Ku.) 



27. PHYSOSTEGIA, Benth. False Dkagon-hkai.. 



Calyx nearly equally .'j-toothed, obscurely 10-nerved, short-tubular or bell- 

 shaped, more or less enlarged and slightly inflated in fruit. Corolla funnel- 

 form, M'ith a much inflated throat, 2-lipped ; upper lip erect, nearly entire ; 

 the lower 3-parted, spreading, small, its middle lobe larger, broad and rounded, 

 notched. Stamens 4, ascending under the upper lip; anthers a])proximate ; 

 the cells parallel. — Smooth perennials, with upright wand-like stems, and 

 sessile lanceolate or oblong mostly serrate leaves. Flowers large and showy, 

 rose or flesh-color variegated with purple, opposite, crowded in sim])le or 

 panic-led terminal leafless spikes. (Name from (pvaa, a bladder, and ari-yr], 

 a cocerimj ) 



1. P, Virginiana, Benth. Stem l-4° high, terminated by a sim]de 

 virgate or several jianicled spikes; leaves thickish ; c(di/x tubuldr-ranipanulate, 

 its teeth half the lenrjth of the tube ; corolla V long. — Wet grounds, from N. Vt. 

 west and southward. Varies greatly. — Var. dknticuiAta, Gray. Slender 

 and commonly low, with crenulate-denticulate or ob.scurely serrate leaves, and 

 slender or loosely-flowered spikes. — Middle Atlantic States. 



2. P. intermedia, Gray. Slender, 1-3° high, remotely leaved; leaves 

 linear-lanceolate, repand-denticulate ; spikes Jiliform, rather remotely flowered ; 

 cali/x short and broadit/ campannlate, its teeth about as long as the tube ; corolla 

 5 - 6" long, much dilated upicard. — Barrens, W. Ky. and Ark. to La. and Tex. 



28. SYNANDRA, Nutt. 



Calyx bell-shaped, inflated, membranaceous, irregularly veiny, almost equally 

 4-toothed ! Corolla with a long tube, much expanded above and at the throat ; 

 the upper lip slightly arched, entire, the lower spreading and 3-cleft, with ovate 

 lobes, the middle one broadest and notched at the end. Stamens 4, ascending ; 

 filaments hairy ; anthers approximate in ])airs under the u])per lij); the two 

 upper each with one fertile and one smaller sterile cell, the latter cells cohering 

 together (whence the name; from avv, together, and dtrf)p, for anther). 



1. S. grandifldra, Nutt. Hairy biennial, 1° high: lower leaves long- 

 petioled, broadly ovate, heart-sha])ed, crenate, thin, the floral .sessile, gradually 

 reduced to bracts, each with a single sessile flower; corolla \V long, yellowish- 

 white. — Shady banks of streams, S. Ohio to 111. and Tenu. In spring. 



29. MARRUBIUM, Tourn. IIoreholnd. 



Calyx tubular, 5- 10-nerved, nearly ecinally .'> - U) toothed, the teeth more or 

 less spiny-pointed and spreading at maturity. I'pjier lip of the corolla erect, 



