Fig 215. [Spiny Clotbur. Xanthium spinosum] L.

Spiny Clotbur. Xanthium spinosum L. Bur oblong, light brown, very slightly flattened, 10–13 mm. long, the beaks weak and small, small hooked prickles 3–4 mm. long, each bur contains two seeds. Introduced from Europe.

Broad Cocklebur. Xanthium strumarium L. Bur dark brown, oval, circular in sections 12–22 mm. long, beaks stout, nearly straight, spines about 5 mm. long, surface of burs and base of spines clothed with minute hooked prickles. Naturalized from Europe.

INDEX.

Name,----Page

Ac-cum´bent, leaning or lying upon, applied to cotyledons when the caulicle (radicle) is folded against their contiguous edges, shown as [Symbol: 0== rotated 90 deg. clockwise].

A-chene´, achenium, a small, dry, one-seeded, indehiscent fruit, likely to be mistaken for a seed.