MENTHACEAE. 319 



and tinged with rose-purple, midvein dividing near base into about 

 8 parallel lateral veins; calyx 7 mm. long, sparsely short pubescent 

 with spreading hairs, 15-nerved, teeth narrowly triangular-subulate, 

 2 mm. long, sparsely short pubescent without, villous within, herba- 

 ceous throughout or tinged with rose-purple; corolla rose-purple, 

 slightly exceeding calyx, sparsely short pubescent, lobes 4 mm. long. 

 Known only from the vicinity of Acton. 



10. KOELLIA Moench. 



Perennial erect herbs with small flowers in terminal 

 or sometimes also axillary capitate or cymose clusters. 

 Calyx ovoid, oblong or tubular, equally or more or less 

 unequally 5-toothed. Corolla 2-lipped, the upper lip 

 emarginate or entire, the lower 3-cleft. Stamens 4, 

 didynamous, nearly equal or the lower pair a little the 

 longer; anther-sacs parallel. Ovary deeply 4-parted; 

 style slender. Nutlets smooth, pubescent or roughened. 



1. K. californica (Torr.) Kuntze. Aromatic, herbage whitish 

 with a very fine and close soft pubescence; stem erect, simple or 

 with a few terminal branches, 5-9 dm. high; leaves ovate to ovate- 

 lanceolate, sessile by an obtuse or subcordate base, entire or denticu- 

 late, 3-9 cm. long; heads terminal and compact; calyx pubescent, 

 the tips of the teeth very woolly exteriorly; corolla white, resin- 

 dotted. {Pycnanthemum californiciim Torr.) 



Occasional in the canyons of all the mountains. April-July. 



11. LYCOPUS L. Water-hoarhound. 



Herbs, perennial b}^ slender stolons or suckers, with 

 erect or diffuse stems, and small white or purple flowers, 

 bracted and verticillate in dense axillary clusters. Calyx 

 campanulate, regular or nearly so, 4-5-toothed, naked in 

 the throat. Corolla funnelform-campanulate to cylin- 

 dric, equaling or exceeding the calyx, the limb nearly 

 equally 4-cleft, or 1 of the lobes broader and emarginate. 

 Perfect stamens 2, anterior, the posterior pair rudi- 

 mentary or wanting; anther-sacs parallel. Ovary deeply 

 4-parted; style slender, 2-cleft. Nutlets truncate at 

 the summit, narrowed belov/, trigonous, smooth. 



1. L. lucidus Turcx. Pubescent or glabrate, perennial by stolons; 

 stem usually stout, erect, strict, leafy, simple or sometimes branched, 

 3-9 dm. high; leaves oblong-lanceolate, acute at the apex, narrowed 

 or rounded at the base, sessile or nearly so, 5-15 cm. long, sharply 

 serrate; bracts ovate or lanceolate, acuminate-subulate, the outer 

 ones often as long as the flowers; calyx-teeth 5, subulate-lanceolate, 

 nearly as long as the tube; corolla slightly exceeding the calyx; 



