204 KEY AND FLORA 
1. H. peruvianum L. Common Heriotrore. 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 cym?s. 
Calyx 5-parted. Corolla funnel-shaped, the mouth closed by 
prominent seales, 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. officinale L. Hounp’s-Toneue, Sueep 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. Witp Comrrery. Perennial. Stem stout, 
simple, erect, leafless above, 2-5 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. 
Ill. LAPPULA Moench. 
Annual or biennial herbs, grayish, with rough hairs. Flowers 
small, blue or whitish, racemed or spiked. Corola 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. Bracar’s Lice. A coarse biennial, 2-4 
ft. high, the stem much branched above. Basal leaves roundish- 
ovate or heart-shaped, on slender petioles; stem leaves 3-4 in. long, 
pointed at both ends. Racemes 1-8 in. long, terminating the slender, 
spreading lranches; flowers small, bluish-white. Fruit forming a 
troublesome bur. Fence rows and thickets. 
