Y08 LABIATAE (MINT FAMILY) 



very numerous^ obtuse at base ; capitate glomerules small and numerous, densely 

 corymbose, imbricated with many short appressed downy rigid ovate or lanceo- 

 late bracts; calyx-teeth short and triangular. (Eoellia KacM.; P. lanceolatum 

 Pursh.) — Dry banks, centr. Me. to Dak., and southw. 



7. P. Torrei Benth. Puberulent; stem strict and nearly simple, 5-9 dm. 

 high ; leaves thin, lanceolate or linear-lanceolate, tapering to both ends, petioled, 

 nearly entire ; flowers in mostly terminal dense capitate clusters ; awl-shaped 

 calyx-teeth and mostly appressed bracts canescent. (Koellia verticillata Am. 

 auth., in part, not Ktze.) — Dry soil, N. Y. and Pa. to Ga. 



b. At least the uppermost leaves closely puberulent above. 



8. P. pilbsum Nutt. Hoary with loose pubescence ; leaves thick, pubescent 

 and dull, oblong-lanceolate, entire, mosthj acute or acutish at base, the upper 

 green ; bracts and especially the narrow (often somewhat unequal) calyx-teeth 

 villous-pubesceut, canescent; stamens exserted. (Koellia Britton ; P. muticum, 

 var. Gray.) — Prairies and dry woods, Pa. to la., Kan., and Ark. 



9. P. verticillatum (Michx.) Pers. Stem closely pubescent, especially- 

 above ; leaves lanceolate, entire or subentire, subse.-,sile, mostly glabrous, only 

 the upper closely puberulent and paler ; bracts of the glomerules ovate-lanceo- 

 late, ciliate, with subulate tips; stamens included. (^Koellia Ktze.; — Moist 

 fields and open woods, w. Que. , Vt. , and e. Mass. to N. C. 



++ ++ Leaves ovate or ovate-oblong 



= Calyx and bracts densely invested with close minute appressed pubescence. 



10. P. incanum (L.) Michx. Leaves ovate-oblong, acute, remotely toothed, 

 downy above and mostly hoary ivith whitish wool underneath, the uppermost 

 whitened both sides; cymes large, open, mostly verticillastrate or terminal, few ; 

 bracts linear or lanceolate, more or less bristly-ciliate ; calyx-teeth deltoid, short, 

 herbaceous, rarely a little bristly-ciliate. (Koellia Ktze.) — Open woods, Vt. 

 and Mass. to Ont., Mo., and southw. 



11. P. albescens T. & G. Closely resembling the preceding, but imth no vil- 

 lous pubescence, the leaves closely cinereous-puherulent beneath. {Koellia Ktze.) 

 — Low sandy ground, Va. and Ky. to Fla. and Tex. 



= = Calyx an'i!, bracts pilose or hispid with distinct spreading hairs. 



12. P. muticum (Michx.) Pers. Minutely hoary throughout, or becoming 

 almost smooth, corymbosely much branched, 8-9 dm. high ; leaves ovate or 

 broadly ovate-lanceolate, rather rigid, acute, rounded or slightly heart-shaped at 

 base, mostly sessile and minutely sharp-toothed, prominently veined, green and 

 glabrate when old ; the floral ones and the subulate-tipped lance-attenuate or 

 linear bracts and the calyx-teeth hoary ; flower-clusters very dense, corymbose ; 

 stamens exserted. (Koellia Britton.) — N. H. to Mo., and southw. 



13. P montanum Michx. Glabrous or essentially so, tall (6-10 dm. high), 

 simple or sparingly branched above; leaves lance-ovate or -oblong, thin, sharply 

 serrate, acuminate ; heads chiefly in the upper axils, or solitary at the tips of the 

 elongate branches; the long thin bracts long-acuminate, ciliate-hispid ; calyx- 

 teeth deltoid-subulate, smoothish. (Koellia Ktze.) — Mountain woods, Va. to 

 Tenn., and southw. 



29. THYMUS [Tourn.] L. Thyme 



Calyx 13-nerved, hairy in the throat ; the upper lip 3-toothed, spreading ; the 

 lower 2-cleft, with the awl-shaped divisions ciliate. Corolla sliort ; the upper 

 lip straight and flattish, notched at the apex, the lower 3-cleft. Stamens 4, 

 straight and distant, usually exserted. — Low perennials, with small and entire 

 strongly veined leaves, and purplish or whitish flowers. (The ancient Greek 

 name of the Thyme, probably from 6^€lv, to burn perfume, because it was used 

 for incense ) 



1. T. Sbrpyllum L. (Creeping T.) Prostrate ; leaves green, flat, ovate, 

 entire, short-petioled ; flowers crowded at the ends of the branches. — Old fields, 

 etc., N. S. to N. Y. and Pa. July, Aug. (Nat. from Eu.) 



