752 LAMIACEAE 



stem sparingly and coarsely pubescent or glabrous ; leaves glabrous or nearly so. 

 Leaves merely coarsely serrate. 



Leaves tapering at the base, rather thin. 3. L. lucidus. 



Leaves rounded at the base, thicker. 4. L. asper. 



Leaves sinuately pinnatifid. 5. L. americanus. 



1. L. communis Bickn. Rootstock tuberous-thickened at the base of the 

 stem; stem 1-8 dm. high, acutely angled; leaves 2.5-8 cm. long, lanceolate or 

 oblong-lanceolate, sharply serrate; calyx campanulate; corolla 2-3 mm. long; 

 lobes spreading. Wet places: Newi. — ^Va. — Neb. — Ore. — ^B.C. Plain — Sub- 

 moni. Au-S, 



2^ L. velutinus Rydb. Stem 3-5 dm. high; leaf-blades lance-elliptic, 



pubescent, 2.5 mm. long; lobes lanceolate, acuminate, the upper two recurved; 

 corolla 3.5 mm. long, glandular-punctate. Low ground and swamps: Colo. 

 Tex. — Miss.^Ark. Son. Au. 



3. L, lucidus Turcz. Stem stout, strict, 3-9 dm. high, sparingly pubescent 

 on the angles; leaves oblong-lanceolate, sessile or short-petioled, 5-15 cm. long, 

 sharply serrate; cal}Tc-teeth subulate-lanceolate, nearly as long as the tube; 

 corolla little longer than the calyx. Wet soil, especially in thickets: Neb. — Kans. 

 — Ariz. — Calif. — B.C. ; Asia. Plain — SubmonL Jl-S. 



4. L. asper Greene. Stem 3-6 dm. high, obtusely angled; leaves firm, 

 narrowly lanceolate, acute, sessile, strongly serrate, 4-6 cm. long, very veiny, 

 rough on both sides; calyx-teeth ovate-lanceolate, acuminate. Wet places: 

 w Ont.— Neb.— B.C. Plain. Jl-Au. 



5. L, americanus Muhl. Stem sharply angled, puberulent or glabrous, 

 1-10 dm. high; leaves lanceolate in outline, p>etioled, acuminate, pinnatifid or 

 incised, 3-10 cm. long; calyx-teeth triangular-subulate, cuspidate, rigid; corolla 

 httle exceedmg the calyx. L. sinuaius Ell. Swamps and wet meadows: Newl. 

 — Fla.— Cahf.— B.C. Plain— SubmonL Je-0. 



MENTHA (Tourn.) L. Mint, Spearmint, Peppermint. 



punctate 



Aromatic caulescent perennial herbs, vnth rootstocks. Leaves opposite, 



toothed, usually petioled. Flowers perfect, in dense, axillary clusters. 

 Cal>TC campanulate, 10-ribbed, regular or nearly so, 5-lobed. Corolla funnel- 

 form or campanulate, nearly regular; lobes 4, the upper larger than the rest. 

 Stamens 4, anther-bearing, erect; anther-sacs 2, parallel. Nutlets smooth. 



Whorls of flowers forming terminal spikes. 1. M. spicata. 



Whorls of flowers all axillary. , 



Stem and petioles densely pubescent with long villous hairs; leaves decidedly puoes- 



cent. • 2. M. lanata. 



Stem and petioles retrorsely strigose or crisp-hairy with short hairs, or glabrous 



below; leaves sparingly puberulent or glabrous. , ,^^„ 



Corolla 5-6 mm. long, open-fimnelform; bracts lanceolate or Imear-lanceo att, 



usTially exceeding the flower-clusters; leaves dark green, not strongly vemeci. 



3. M. occidentals. 



CoroUa 4-5 mm. long, salver-shaped-funnelform; bracts Unear or subulate, shorter 



than the flower-clusters. , ,, .-^^^ 



Leaf-blades thin, dark green, not strongly veined, tapering gradually m^^ 



slender petioles, which equal or exceed the flower-clusters. , , . ^ 



- 4. M. glabrior. 



Leaf-blades thick, strongly veined, abruptly contracted into short petioles, 



which are much shorter than the flower-clusters. ^, ^ i^rnad 



Plant pale green, stout, 4-8 dm. high; calyx-teeth much longer than orpau. 



Plant usually purplish. low. 2-4 dm. high; calyx-teeth scarcely longer T.na.ii 

 broad. e. » .? 6. Ai. rubella. 



1. M. spicata L. Stem erect. 3-5 



'f 



3-7 cm. loner: soikes 5-10 



subulate-lanceolate, ciliate; calyx-teeth subulate; corolla glabrous. Spearaunt. 

 Fields and waste places: N.S.— Fla.— Kans.— Minn.: Calif.— Utah— B.O.; nar. 



. ^ . Minn.; Calif. 



from Eu. Plain— SubmonL Jl-S. 



2. M. lanata (Piper) Rydb. Stem 3-6 dm. high; leaves short-petioled 

 lanceolate or ovate, serrate, 2-7 cm. long, more or less pilose above, vxuou. 

 beneath; bracts subulate, about equalling the flowers: calyx 2.5-3 mm. long 



