418 FLORA OF TEXAS. 



ticulate on the margins; nutlets smooth.— Erect mostly 

 simple perennials ; whorls crowded in a dense cone-like 

 terminal head ; corolla large, white or purple. 



M. PULCHRA, Ell. Smooth or hairy; leaves lanceo- 

 late, acute, serrulate, dotted, the lower ones narrowed into 

 a petiole, the upper sessile, the floral ones ovate, acute; 

 whorls 4-flowered ; calyx striate, the lobes entire ; corolla 

 purple, the tubes striped with purple and white, the upper 

 lip entire. Pine-barren swamps. August and September. 

 Stem l°-lj°high; corolla If long. 



MAERUBIUM, L. Horehound. 

 Calyx tubular, 5-10-nerved, nearly equally 5-10-toothed, 

 the teeth spiny, mostly spreading in fruit ; corolla-i\\be, in- 

 cluded in the calyx, 2-lipped, the upper lip erect, the lower 

 3-lobed, with the middle lobe largest ; stamens 4, included ; 

 anther-cells diverging; lohes of the style short, obtuse; 

 nutlets obtuse at the apex. — Chiefly tomentose or woolly 

 perennial herds, with rugose leaves, and axillary luhorls. 



M. YULGARE, L. Woolly ; steins branching at the base, 

 ascending ; leaves petioled, ovate or roundish, crenate, the 

 floral ones smaller, but longer than the capitate many- 

 flowered whorls ; calyx-iQQih. 10, recurved-spreading ; corol- 

 la small, white. Waste ground and roadsides. Stems l°-2° 

 high. 



LEOJS-OTIS, R. Brown. 



Calyx tubular, 10-nerved, incurved, unequally 8-10-tooth- 

 ed, the teeth straight, spiny, the upper one largest ; corolla 

 slender, 2-lipped, the upper lip long, arching, entire, the 

 lower very short, 3-cleft, spreading; stamens 4, ascend- 

 ing under the upper lip; anther-cells diverging; nutUts 

 3-angled, truncate. — Tall herbs, with very large globose 

 ivhorls in the axils of the upper leaves ; flowers yellow or 

 scarlet. 



L. KEPET^FOLiA, R. Br. Annual ; stem tomentose, 



