=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.
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.
A-CU´MIN-ATE, ending in a prolonged tapering point.
A-NAT´RO-POUS, a name applied to an ovule or seed which grows so that the funiculus coheres to the whole length forming a raphe along the edge bringing the hilum near the micropyle while the chalaza is at the other extremity.
A´PEX, the tip or growing point of an organ.
BARBED, furnished with rigid points or short bristles, usually reflexed like the barb of a fish-hook.
Buttercup, bitter, creeping, or tall, 131
CAR´UN-CLE, an excrescence or protuberance near the hilum of a seed.
c. m. centimeter, see ruled lines on last page, 183
Centimeter, see ruled lines on last page, 183
DEL´TOID, shaped like the Greek letter delta; triangular.
EL-LIP´TIC-AL, oblong and rounded at the ends; longer than oval.
EM´BRY-O, the little plant forming a part of the seed, usually consisting of caulicle, one or more cotyledons and a plumule.
FE´MALE FLOW´ER, one having pistils only, but no stamens; pistillate flower.
FER´TILE, producing fruit, or reproductive bodies of any kind.
FLO´RET, a single flower of a head or cluster, especially in Compositae.
GLUME, one of the outer floral envelopes in grasses or sedges. The term as now used includes the bracts (empty glumes) which subtend a spikelet and the lower of the two bracts subtending the individual flower (flowering or floral glume, lemma).
GRAIN, the caryopsis or fruit of Gramineae; any small seed.
HAS´TATE, like the head of a halberd--applied to leaves which have a spreading lobe on each side of the base.