700 



LABIATAE (MINT FAMILY^ 



16. LAmIUM L. Dead Nettle 



Calyx tubular-bell-shaped, about 6-nerved, with 5 nearly equal awl-pointed 

 teeth. Corolla dilated at the throat; upper lip ovate or oblong, arched, nar- 

 rowed at the base ; the middle lobe of the spreading lower lip broad, notched 

 at the apex, contracted as if stalked at the base ; the lateral ones small, at the 

 margin of the throat. — Decumbent herbs, the lowest leaves small and long- 

 petioled, the middle heart-shaped and doubly toothed, the floral subtending the 

 whorled flower-cluster. (Name from Xat,u6s, throaty in allusion to the ringent 

 corolla.) 



* Annuals or biennials, low; flowers small, purplish, at most 1.5 cm. long. 



1. L. AMPLExicAULB L. (Henbit.) Zcaves rouudcd, deeply crcnate-toothed 

 or cut, the upper ones clasping ; corolla elongated, upper lip bearded, the lower 

 spotted, lateral lobes truncate. — Waste and cultivated places. Apr. -Oct. 

 (Nat. from Eu.) 



2. L. PDRPUREUM L. Leaves roundish or oblong, heart-shaped, crenate- 

 toothed, all petioled. — N. E. to N. C. Apr., May. (Nat. from Eu.) 



* * Perennial, taller ; flowers larger. 



3. L. Album L. Hairy ; leaves ovate, heart- 

 shaped, petioled ; calyx-teeth very slender, spread- 

 ing ; corolla white, the tube curved upward, 

 obliquely contracted near the base, where there is 

 a ring of hairs inside ; lateral lobes of lower lip 

 bearing a long slender tooth. — Roadsides and 

 waste places, mostly escaped from cultivation. 

 May-July. (Introd. from Eu.) Fig. 894. 



4. L. maculAtum L. Like the last, but leaves 

 more frequently marked with a white spot on the 

 upper face, and flowers purplish or white, with 

 the ring of hairs transverse instead of oblique. — . 



Sparingly escaped to roadsides and thickets. May- July. (Introd. from Eu.) 



894. L. album x %. 



17. LEONtTRUS L. Motherwort 



Calyx 5-nerved, with 5 nearly equal teeth. Upper lip of the corolla oblong 

 and entire, somewhat arched ; the lower spreading, 3-lobed, its middle lobe 

 larger, narrowly oblong-obovate, entire, the lateral ones oblong. — Upright herbs, 

 with cut-lobed leaves, and close whorls of flowers in their axils ; in summer. 

 (Name from \^wv, a lion, and oipd, tail, i.e. Lion'' s-tail.) 



1. L. CardUca L. (Common M.) Tall perennial ; leaves long-petioled, the 

 lower rounded, palmately lobed, the floral wedge-shaped at base, subentire or 

 S-cleft, the lobes lanceolate ; upper Up of the pale purple corolla bearded. — 

 Waste places, around dwellings. (Nat. from Eu.) 



2. L. MarrubiAstrum L. Tall biennial, with elongated branches ; stem- 

 leaves oblong-ovate, coarsely toothed; corolla whitish, shorter than the calyx- 

 teeth, the tube naked luithin ; lower lip rather erect. — Waste places, etc.. Pa. 

 and Del. (Adv. from Eu.) 



3. L. siBfRicus L. Tall biennial ; leaves ^-parted, the divisions 2-^-cleft, or 

 deeply ^-1 -cleft and incised; corolla purplish, twice as long as the calyx, the 

 upper lip fornicate, the lower little spreading. — Waste grounds, Pa. and Del. 

 (Adv. from Eurasia.) 



18. BALL6TA L. Fetid Horehound 



Calyx nearly funnel-form ; the 10-ribbed tube expanded above into a spread- 

 ing regular border, with 5-10 teeth. Anthers exserted beyond the tube of the 

 corolla, approximate in pairs. Otherwise much as in Marrubium. (The Greek 

 name, of uncertain origin.) 



