

LABIATAE (MINT FAMILY) 711 



- H- Calyx glabrous. 



8. M. CITR\TA Ehrh. Glabrous or glabrate ; leaves slender-petioled, ovate, 

 coarsely appressed-serrate ; flowers in small roundish heads, terminal and in the 

 upper axils. Damp soil, Ct. arid N. Y. to O. and Mich. (Nat. from Eu.) 



* * * Flowers in globular whorls or clusters, all in the axils of the leaves, the 

 uppermost axils rarely flower-bearing ; leaves more or less petioled, toothed. 



-- Upper leaves conspicuously reduced, 2 or 3 times exceeding the glomerules. 



9. M. CARDIAC A Gerarde. Tall and erect, with ascending branches toward 

 the top ; stem more or less pubescent ; leaves lanceolate to oblong-lanceolate, 

 acuminate, sharply serrate, slightly pubescent. (M. sativa of many Am. auth., 

 not L.) Wet meadows and shores, N. S. to Pa. (Nat. from Eu.) Resembling 

 M. spicata, but with more interrupted leafy inflorescence. 



t- - Upper leaves scarcely reduced, much exceeding the glomerules. 

 w Stem glabrous or rarely with a few scattered hairs. 



10. M. GENTILIS L. Stems freely branching from below, often reddish^ 1 m. 

 or less high; leaves ovate to obovate, coarsely and sharply serrate, especially 

 above, slightly pubescent or glabrate, frequently white-mottled. (M. sativa L.) 

 Rich damp soil, P. E. I. to la. and N. C. (Nat. from Eu.) 



w. -w Stems retrorse-pubescent at least on the angles with fine hairs. 



11. M. arvSnsis L. Stems freely branching, especially below, or subsimple, 

 1-8 dm. high, more or less retrorse-pubescent; leaves oblong to ovate, rounded 

 at base, minutely pubescent or villous, closely serrate, the primary ones dis- 

 tinctly petioled ; calyx pubescent, the teeth from deltoid to subulate ; corolla 

 white, pink, or violet. Abundant in damp rich soil, Nfd. to Neb. and Ky.; also 

 inCal.,etc. (Eurasia,) 



Var. canad6nsis (L.) Briquet. Leaves pubescent, lanceolate to oblong-lan- 

 ceolate, cuneate-narrowed at base. (M. canadensis L.) N. B. to B. C., and 

 southw. Var. LAN!TA Piper. Stems and lower surfaces of leaves densely to- 

 mentose or lanate. Me. to B. C. and Cal. 



Var. glabrata (Benth.) Fernald. Less branched ; stems glabrous on the sides, 

 minutely pubescent on the angles ; leaves oblong to ovate, glabrous, short-peti- 

 oled. (M. canadensis, var. Benth.; M. arvensis, var. Penardi Briquet.) 

 Gaspe" Co., Que., to B. C., s. to n. N. E., n. Pa., Mo., N. Mex., and Cal. 



33. COLLINSdNIA L. HORSE BALM 



Calyx ovoid, enlarged and declined in fruit, 2-lipped ; upper lip truncate and 

 flattened, 3-toothed, the lower 2-cleft. Corolla elongated, expanded at the 

 throat, somewhat 2-lipped, the tube with a bearded ring within ; the 4 upper 

 lobes nearly equal, but the lower much larger and longer, pendent, toothed or 

 lacerate-f ringed. Stamens 2 (sometimes 4, the upper pair shorter), much ex- 

 serted, diverging ; anther-cells divergent. Strong-scented perennials, with large 

 ovate leaves, and yellowish flowers on slender pedicels. (Named in honor of 

 Peter Collinson, early English botanist.) 



1. C. canadSnsis L. (RICH-WEED. STONE-ROOT.) Nearly smooth, 5-10 dm. 

 high ; leaves serrate, pointed, petioled, 1-2 dm. long ; panicle loose ; corolla 

 1.5 cm. long, lemon-scented ; stamens 2. Rich moist woods, w. Que. to Wise., 

 s. to Fla. and Mo. July-Sept. 



34. PERILLA L. 



Calyx as in Collinsonia. Corolla-tube included, the limb 5-cleft ; lower lobe 

 a little larger. Stamens 4, included, erect, distinct. Coarse aromatic annual, 

 with small flowers. (A Greek and Latin proper name.) 



1. P. FRUTESCENS (L.) Britton. Erect, branching, 0.3-1 m. high ; leaves 

 ovate, coarsely toothed; flowers white. (P. ocymoides L.) About dwellings 

 and roadsides, Ct. to Mo. and N. C. (Nat. from e. Asia.) 



