Fig 150. [Stick-Seed. Burr Seed. Lappula echinata] Gilibert. Lappula Lappula (L.) Karst.

Stick-Seed. Burr Seed. Lappula echinata Gilibert. Lappula Lappula (L.) Karst. Flowers blue, ovary deeply 4-lobed separating into four warty achenes, each one brown, about 2.5 mm. long, slightly flattened, ovate with wedge-shaped apex; the upper side bearing a few stiff straight, diverging cap-shaped hairs, bearded on all sides; lower side destitute of hairs, bearing a straight ridge from the point to the middle of the large end. Introduced from Europe. Very objectionable in pastures.

Fig 151. [Wild Comfrey. Lappula Virginiana] (L.) Greene.

Wild Comfrey. Lappula Virginiana (L.) Greene. Flowers blue; ovary deeply 4-lobed separating into four brown achenes, about 3 mm. long, flattened on upper side, broadly ovate, the apex wedge-shaped, the upper side clothed with stiff straight cap-shaped hairs, bearded on all sides; lower side a low 4-sided cone, nearly smooth with a concave triangular scar. Native to rich woodlands.

Fig 152. [Red Root. Wheat Thief. Corn Gromwell. Lithospermum arvense] L.

Red Root. Wheat Thief. Corn Gromwell. Lithospermum arvense L. Flowers white; ovary 4-divided separating into four hard, conical-ovoid achenes, each dull gray, erect, wrinkled, 2.5–3 mm. long, convex on the back, keeled on the inner side, base obliquely truncate, containing two minute white tubercles. A prominent weed of high rank in fields of winter wheat.