LABIATAE (MINT FAMILY) 711 



-- - Calyx glabrous. 



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

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

 upper axils. Damp soil, Ct. arid N. Y. to 0. 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- -t- Upper leaves scarcely reduced, much exceeding the glomerules. 

 ** 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.) 



*+ *+ 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 

 in Cal., etc. (Eurasia.) 



Var. canadSnsis (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.) 

 Gasp< 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. canadlnsis 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 lirnb 5 <;left ; lower lobe 

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

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



1. P. FRUTE8CENS (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.) 



