Mentha. LABIATE. 351 



8. C0LLINS6NIA, L. Horse-Balm, Citronella. {Peter Collin- 

 son of Londou, who corresponded with Linnceus and John Bartram, and received 

 from the latter the original species.)— Odorous and large-leaved perennials (of 

 Atlantic North America) ; with thickened roots or rootstocks, ovate and serrate 

 veiny leaves, mostly on long petioles, and simple or panicled naked terminal 

 racemes of yellow or whitish flowers ; mostly only a single naked pedicel to each 

 small bract. 



* Fertile stamens 2; upper pair rudimentary or obsolete: cah'x-teeth all subulate-acute: flowers 

 ill late summer or autumn, on slender pedicels, solitary from the axil of each small subulate bract. 



C. SCabriuscula, Ait. Glabrate orminutely pubescent, 1 to 3 feet high from a tuberous 

 stock, commonly leafless below : leaves small for the genus (2 or 3 inches long), broadly 

 ovate, often rather scabrous above : corolla 3 or 4 lines long, yellowish or purple-spotted. 

 — Ait. Kew. ed. 1, 1. 47 (1789) ; Benth. Lab. & in DC. Prodr. xii. 253. C. prmcox, Walt. Car. 

 65? (1788), but not early flowering. C. tuberosa, Michx. Fl. 1.17. C. scabra, Pers. Syn. 

 i. 29; Pursh, Fl 1.20; Ell. Sk. i. 35. C. ovalis, Pursh, 1. c, from the char.?— Open 

 woods, S. Carolina to Florida and E. Arkansas. 



O. Canadensis, L. (Horse-weed, Stone-root, &c.) Glabrous, or the inflorescence 

 glandular-puberulent, 2 to 4 feet high, leafy : leaves ample (4 to 9 inches long), from 

 broadly ovate to oblong, rarely subcordate : racemes amply paniculate : calyx in flower a 

 line, in fruit 4 or 5 lines long : corolla lemon yellow, lemon-scented, 5 or 6 lines long. — 

 Hort. Cliff, t. 5, & Spec. i. 28 ; Torr. Fl. N. Y. t. 75. C. decussata, Moencli, Meth. 379. C. 

 ovalis, Pursh, 1. c. & herb.,, ex Benth. — Rich woods, Canada to Wisconsin and south to 

 Florida, chiefly in the upper country. 



Var. punctata. Inflorescence more puberulent and glandular: leaves minutely 

 tomentose-pubescent beneath and more obviously punctate. — C. serotlna, Walt. Car. 65. 

 C. punctata, Ell. Sk. i. 36. -^ Rich soil, Carolina and Georgia, towards tlie coast. 



* * Fertile stamens 4, usually 2 ascending and 2 descending: corolla rather broader, about half 

 inch long, viscid-pubescent : flowers earlier. 



C. verticillata, Baldw. Stem a foot high, leafless and glabrous below, at summit 

 bearing two approximate pairs or a seeming whorl of thin and large (3 to 7 inch) ovate 

 coarsely serrate and glabrous leaves : peduncle mostly simple and slender, viscid-pubes- 

 cent, supporting a single raceme : bracts minute : lower pedicels often in pairs or threes : 

 calyx-teeth all attenuate-subulate : corolla yellow or purplish, Ell. Sk. i. -37 ; Benth. Lab. 

 & in DC. 1. c. ; Chapm. Fl. 316. — Rich woods, western part of S. Carolina and Georgia to 

 Tennessee and Mississippi : fl. May. 



C. anisata, Sims. (Citronella, French Tea.) Copiously viscid-pubescent, or the 

 foliage glabrate, sweet-scented : stem 2 or 3 feet high, leafy : leaves ovate, rarely subcord- 

 ate, obtusely serrate, veiny, somewhat rugose, 3 to 8 inches long : racemes paniculate : 

 bracts ovate, conspicuous, mostly subtending single short pedicels : upper lip of calyx with 

 very broad and ovate mostly obtuse teetli ; those of the lower lanceolate : corolla yellow- 

 ish or cream-color.— Bot. Mag. t. 1213; Pursh, Fl. i. 21; Ell. Sk. i. 37. — S. Carohna to 

 Alabama and Florida, chiefly in the middle country : fl. summer. 



9. M:6NTHA, Tourn. Mint. (Mivdtj, the ancient Greek name.) — Odorous 

 perennial herbs, mostly spreading by slender creeping rootstocks : calyx naked at 

 the throat in our species. Flowers small, whitish or purplish, glomerate (in 

 summer), not rarely gynodioccious, i.e. some individuals produce female flowers 

 with impotent stamens instead of perfect ones. 



* Introduced from the Old World, to which most of the species belong. Many hybrids. 

 H- Inflorescence terminal. 

 ++ Densely capitate glomerules all much crowded in leafless narrow spikes: leaves either sessile or 

 very short petioled. 

 M. SYLVESTRLS, L. (HoRSE MiNT of Eu. ) Finely pubescent or canescent: leaves from 

 ovate-oblong to oblong-lanceolate, acute, sharply serrate, often glabrous above: spikes 

 rather slender, canescently pubescent or cinereous. — Spec. ed. 2, ii. 804; Engl. Bot. ed. 



