202 ELEMENTS OF BOTANY. 



T. Canadense L. Germander. Stem erect, simple or branched, 

 tomeiitose, 1^-3 ft. high ; leaves lanceolate to ovate, acute at the 

 apex, shoi't-petioled, serrate, pubescent above, white-hoary beneath ; 

 flowers in dense hoary spikes which finally become much elongated 

 in fruit, flower clusters usually alternate, bracted; calyx bell-shaped, 

 pubescent, the 3 upper teeth short ; corolla purplish, about | in. 

 long. June-September. On low ground. 



II. TRICHOSTEMA. 



Annual or perennial herbs ; stems erect, branching ; leaves 

 entire; flowers in loose panicles or cymes; calyx short, the 

 3 lower teeth long, connate, the 2 upper short ; corolla slen- 

 der, the limb deeply o-cleft ; stamens 4, didynamous, long- 

 exserted, filaments coiled ; ovary deeply 4-lobed ; nutlets 

 pitted, united at the base. 



T. DiCHOTOMTiM L. Blue Curls. Stem erect, slender, widely 

 branched, viscid-pubescent or nearly smooth, 1-2 ft. high ; leaves 

 lanceolate to oblong, short-petioled, the upper small and bract-like ; 

 flowers in a spreading panicle, often 3 together ; corolla blue to 

 white, declined ; stamens blue, very long. June-September. On 

 dry soil. 



III. SCUTELLARIA. 



Perennial herbs with bitter juice ; flowers in spike-like 

 racemes or solitary in the axils; calyx 2-lipped, the lips 

 entirfe, the upper with a prominent helmet-shaped protuber- 

 ance on the back, deciduous, the low^er persistent; corolla 

 tube recur ved-ascending, dilated at the throat, limb 2-lipped, 

 the upper lip arched, entire or notched at the apex, middle 

 lobe of the lower lip much the longest, spreading; stamens 

 4, didynamous, the upper pair shorter, anthers ciliate ; ovary 

 deeply 4-parted, style unequally 2-cleft ; nutlets roughened. 



S. coRDiFOLiA Muhl. Heart-leaved Skullcap. Stem slen- 

 der, erect, simple or branched, pubescent, 6-18 in. high; lower 

 leaves long-petioled, cordate or ovate, often crenate, the upper sessile, 

 linear or elliptical, entire, pubescent ; racemes mostly solitary, bracts 

 longer than the pedicels ; flowers blue and white, about 1 in. long, 

 the lips nearly equal. June-August. On dry soil. 



