204 KEY AND FLORA 



1. H. peruvianum L. COMMON HELIOTROPE. Somewhat shrubby, 

 much branched. Leaves lance-ovate or somewhat oblong, veined 

 and much wrinkled, short-petioled. Flowers numerous, in a cluster 

 of terminal spikes, bluish-purple or lavender, very sweet-scented, the 

 odor not unlike that of vanilla. Cultivated from Peru. 



II. CYNOGLOSSUM L. 



Coarse, rough-hairy or silky biennials. Flowers small, 

 bluish-purple or white, in forked and usually bractless cymes. 

 Calyx 5-parted. Corolla funnel-shaped, the mouth closed by 

 prominent scales, its lobes obtuse. Stamens not projecting. 

 Styles stiff, persistent. Nutlets 4, covered with hooked or 

 barbed bristles, attached to a thickened, conical receptacle. 



1. C. officinaleL. HOUND'S-TONGUE, SHEEP LICE, DOG BUR, STICK- 

 TIGHTS. Stem 1-2 ft. high, soft-downy, panicled above. Basal 

 leaves 8-10 in. long, long-petioled, oblong or oblong-lanceolate ; 

 stem leaves sessile, linear-oblong or lanceolate, rounded or heart- 

 shaped at the base. Corolla in. in diameter, reddish-purple. Nut- 

 lets in. long, with a thickened border. Whole plant with a strong 

 smell like that of mice. A troublesome weed ; along roadsides and 

 in pastures ; naturalized from Europe. 



2. C. virginianum L. WILD COMFREY. Perennial. Stem stout, 

 simple, erect, leafless above, 2-3 ft. high. Leaves oval or oblong, the 

 upper clasping by a heart-shaped base. Racemes bractless; flowers 

 pale blue, on short pedicels, which are recurved in fruit. Nutlets not 

 margined, separating and falling away at maturity. On dry soil. 



m. LAPPULA Moench. 



Annual or biennial herbs, grayish, with rough hairs. Flowers 

 small, blue or whitish, racemed or spiked. Corolla salver- 

 shaped, its throat closed with 5 concave scales. Nutlets more 

 or less covered with prickles, which are barbed at the tip, 

 attached by their sides to the base of the style. 



1. L. virginiana Greene. BEGGAR'S LICE. A coarse biennial, 2-4 

 ft. high, the stem much branched above. Basal leaves roundish- 

 ovate or heart-shaped, on slender petioles ; stern leaves 3-4 in. long, 

 pointed at both ends. Racemes 1-3 in. long, terminating the slender, 

 spreading branches; flowers small, bluish-white- Fruit forming a 

 troublesome bur. Fence rows and thickets. 



