250 LAMIACEAE. 



crenate-lobed : calyx becoming 5-6 mm. long: corolla purple, 13-17 mm. long; 

 tube slender, the lower lip with mucronate lateral lobes and a cuneate middle 

 lobe: nutlets slender, less than 1 mm. wide. Common, in cultivated and waste 

 grounds. Nat. of Eu. Spr.-fall. HENBIT. 



2. L. purpureum L. Stem and branches finely pubescent, the branches often 

 creeping: leaf -blades ovate, orbicular or reniform, 1-3 cm. long, crenate, cor- 

 date at the base, mostly long-petioled : calyx becoming 9-11 mm. long; lobes 

 lanceolate-subulate, about as long as the tube: corolla purple or purplish, 11- 

 15 mm. long; tube stout, straight, the lower lip with a reniform middle lobe: 

 nutlets stout, fully 1 mm. wide. M. Occasional, in shaded places. Nat. 

 of Eu. Sum. DEAD-NETTLE. 



13. LEONURUS L. Annual, biennial, or perennial, erect herbs. Leaf- 

 blades broad, toothed or parted. Flowers in dense axillary cymes. Calyx 

 somewhat irregular: lobes firm, slender. Corolla 2-lipped, not curved: upper 

 lip erect or nearly so: lower lip 3-lobed, the middle lobe much larger than the 

 lateral ones. Stamens 4 : filaments pubescent. Sum. MOTHER WORT. 



Calyx much shorter than the corolla : corolla purple, pubescent within : blades of 

 the lower cauline leaves lobed. 1. L. Cardiaca. 



Calyx as long as the corolla : corolla pink, glabrous within : 



blades of the lower cauline leaves coarsely toothed. 2. L. MarruMastrum. 



1. L. Cardiaca L. Perennial, 3-12 dm. tall: leaf -blades orbicular to oblong, 

 2-10 cm. long, the lower ones palmately 3-5-lobed, with incised- serrate divi- 

 sions, upper ones 3-lobed or entire: calyx-lobes exceeded by the corolla: 

 corolla 9-10 mm. long : filaments villous. Common, in w r aste places and on 

 roadsides. Nat. of Eu. 



2. L. Marrubiastrum L. Biennial, 5-15 dm. tall: leaf -blades ovate to oblong- 

 ovate, 2.5-7.5 cm. long: calyx-lobes equalling the corolla: corolla 7-8 mm. 

 long : filaments puberulent. S. .Occasional, on shaded banks of the Octo- 

 raro Creek. Nat. of Eu. 



14. STACHYS [Tourn.] L. Annual or (ours) perennial, erect or spread- 

 ing herbs. Leaf -blades entire or toothed. Flowers in continuous or interrupted 

 panicles. Calyx nearly regular : lobes 5, shorter than the tube. Corolla mainly 

 purple, 2-lipped: upper lip erect: lower lip spreading, 3-lobed, the middle 

 lobe somewhat larger than the lateral ones. Stamens 4, all anther-bearing: 

 anthers short. Sum. HEDGE-NETTLE. 



Leaf-blades narrowed at the base. 1. S. ambigua. 



Leaf-blades, all or some of them, cordate or truncate at the base. 

 Foliage copiously pubescent : corolla-tube slightly longer than 



the calyx : calyx-lobes slender-subulate. 2. 8. palustris. 



Foliage glabrous or almost so : corolla-tube much longer than 

 the calyx : calyx-lobes lanceolate or triangular-lanceolate. 

 Inflorescence glabrous or nearly so: calyx-lobes glabrous or 

 nearly so, ultimately lax : upper corolla-lip essentially 

 glabrous and eciliate. 3. S. tenuifolia. 



Inflorescence bristly-pubescent : calyx-lobes copiously pubes- 

 cent, permanently erect : upper corolla-lip pubescent and 

 ciliate. 4. 8. aspera. 



1. S. ambigua (A. Gray) Britton. Stems 3-10 dm. tall, hirsute: leaf-blades 

 narrowly oblong to oblong-lanceolate, 3-6 cm. long, pubescent: calyx 6-8 mm. 

 long; lobes lanceolate, as long as the tube or nearly so: corolla 11-13 mm. 

 long : nutlets over 2 mm. long. Susquehanna valley. Occasional, on the 

 river shore. Schists. 



2. S. palustris L. Stems 1 m. tall or less, hirsute: leaf -blades lanceolate, 

 oblong-lanceolate, or ovate-lanceolate, 4-10 cm. long, mostly acute or acumi- 



