Indian Mustard. Brassica juncea (L.) Cossos. See also cuts of turnip and black mustard. Introduced from Europe.

Fig 84. [Black Mustard. Brassica nigra] (L.) Koch.

Black Mustard. Brassica nigra (L.) Koch. Seeds dark brown to reddish brown, 1–1.7 mm., spherical, or broadly oblong, not flattened. The surface of well developed specimens presents a delicate but evident net work of fine ridges which appear under the lens as dark lines. The scar (hilum) is a whitish, elevated spot, at one extremity of the oblong seeds. See cuts of seeds of turnip. Introduced from Europe. A vigorous persistent weed.

Fig 85. [Small Fruited False-Flax. Camelina microcarpa] Andrz.

Small Fruited False-Flax. Camelina microcarpa Andrz. Flowers small, yellow; pods pear-shaped, flattened, about 6 mm. long, surrounded by a vertical ridge; seeds reddish brown, granular, usually broad-oval, about 1 mm. long, slightly flattened, the vertical ridge much less prominent than in C. sativa. When wet the seed is soon covered with mucilage. Not yet very common. Naturalized from Europe.