Hedeoma. LABIATiE. 361 



lar and gibbous calyx and the bracts very hirsute, nearly equalling the light purple nar- 

 row corolla. — C/iiiopodiummilgare, L. ; Smith, Engl. Bot. t. 1401. — Borders of thickets and 

 fields, common northward, and seemingly introduced : indigenous from the Great Lakes to 

 the Rocky Mountains. (Eu., Asia.) 



20. MELfSSA, Tourn. Balm. (Greek name of the honey-bee, trans- 

 ferred to a plant the blossoms of which are sought by bees.) — Herbs, of the Old 

 World, only one common species. 



M. OFFICINALIS, L. (Common Balm.) Upright or spreading and branching perennial, 

 pubescent ; with broadly ovate or cordate crcnate-toothed lemon-scented leaves, and loose 

 axillary cymes of white or whitish flowers; in summer. — Escaped from gardens to waste 

 grounds, eastward. (Sparingly nat. from Eu.) 



21. CONRADINA, Gray. (Named in memory oi Solomon W. Conrad, oi 

 Philadelphia, botanist, and publisher of his friend Muhlenberg's works.) — Proc. 

 Am. Acad. viii. 244. — Founded on a single species ; with leaves resembling Rose- 

 mary. 



C. canescens, Gray, 1. c. Somewhat shrubby, much branched, minutely canescent, 

 leafy : the leaves also fascicled in the axils, narrowly linear, obtuse, with revolute mar- 

 gins : flowers solitary or in threes in the upper axils, short-pedicelled : teeth of the calyx 

 and sometimes the tube villous with long spreading hairs : corolla pink or white, dotted in 

 the throat, hairy outside, half inch long. — Calamlntha canescens, Torr. & Gray in DC. 

 Prodr. xii. 229; Cliapm. Fl. 318. — Sandy sea-shore and adjacent pine woods, Alabama and 

 Florida, from Mobile to Tampa Bay (Ilulse), and Indian River on the east {Palmer) : fl. 

 summer. 



22. POLIOMiNTHA, Gray, {nohog, hoary-white, and nivda, Mint.) — 

 Texano-Mexican low suffrntescent plants, canescent throughout or nearly so ; 

 with entire leaves, and few-several-flowered cymes or glomerules in their axils, 

 the uppermost sometimes diminished and bract-like. Corolla rose-color or purple, 

 with tube either equalling or much suriDassiug the calyx. — Proc. Am. Acad. viii. 

 295, 365; Benth. & Hook. Gen. ii. 1189. (Genus too near Gardoquia, of the 

 Andes from Mexico to Chili, not to be distinguished if that becomes really 

 diandrous.) 



P. incana, Gray, 1. c. A foot or so high, very much branched, silvery with very close 

 and minute tomentum : branches virgate : leaves linear or the lower oblong (3 to 9 lines 

 long), sessile, veinless and the midrib obscure ; the upper floral shorter than the 1 to 3 sub- 

 sessile flowers in their axils : calyx oblong or cylindraceous, 15-nerved, white-villous 

 (3 lines long), with conspicuous subulate teeth, half the length of the corolla, equalling its 

 tube, which is pilose-annulate at the summit. — Hedeoma incana, Torr. Mex. Bound. 130. — 

 Western Texas to S. Utah, Wright, Bic/elow, Parry, Brandegee, Mrs. Thompson, &c. 



P. mollis, Gray, 1. c. A foot or more high, more tomentose, herbaceous nearly to the 

 base : leaves ovate or oval, narrowed into a short petiole, 3-5-plinerved : calyx-teeth 

 minute, unequally spreading, one-fifth the length of the 13-striate tube, which is hardly 

 half the length of the corolla : tube of the latter not annulate but sparsely pilose within. 

 — Hedeoma mollis, Torr. I.e. 129. — Borders of Mexico and Texas, on cliffs of the Rio 

 Grande at Puerte de Paysano, Biyelow. 



23. HEDE6MA, Pers. (Name altered from the Greek' HdvoafAOv, a sweet- 

 smelling herb, probably of this family. The plants have the scent and taste of 

 the European Pennyroyal, J/ew^/m Pidegium.) — Low herbs, all American, chiefly 

 of Atlantic U. S. and Mexico ; with small flowers, in summer. — Gray, Proc. Am. 

 Acad. viii. 3G6; Benth. & Hook. Gen. ii. 1188. 



