An Illustrated Guide to ARIZONA WEEDS

The University of Arizona Press

RESCUE BROME, rescue grass

Illustration

GRASS FAMILY-Gramineae

RESCUE BROME-Bromus catharticus Vahl.

DESCRIPTION-Rescue brome is an annual, a winter annual, or biennial, 1/2 to 3 feet high, which reproduces only by seeds. It has thin flattish leaves, l/8 to l/3 inch broad. The flowering part is branched, and up to 8 inches long. The spikelets are large, 3/4 to 1 1/4 inch long, strongly flattened and composed of 6 to 12 sharply folded, overlapping flowering bracts, which may or may not end in a stiff bristle. The grain is about 3/8 inch long.

DISTRIBUTION-A native of South America, rescue brome is principally a weed in lawns, gardens, roadsides, ditchbanks, and small grain winter crops. Found in all counties, from 140 feet at Yuma to over 7,000 feet elevation on the Kaibab plateau, it is locally abundant around Tucson and rapidly increasing throughout southern Arizona; flowering from late February to September (higher altitudes). Like the bromes below, it disappears during hot weather.

RED BROME, foxtail brome, foxtail chess-Bromus rubens L.

DESCRIPTION-A spring annual, 1/2 to 1 1/3 feet high with the flowering part erect, 1 1/2 to 3 1/2 inches long and crowded. The spikelets, about 1 inch long, have 4 to 11 flowering bracts, each ending in a reddish brown bristle about 3/4 inch long.

DISTRIBUTION-Red brome is troublesome, principally on overgrazed range- lands in central Arizona where it has spread rapidly, uncommon southward and northward, 1,300 to 5,500 feet elevation; flowering March to June. The mature bristles are mechanically injurious to the eyes, mouths, and wool of animals.

DOWNY CHESS, cheatgrass brome, downy brome, slender chess-Bromus tectorum L.

DESCRIPTION-Weak, tufted annuals with very hairy leaves. The flowering part, 2 to 6 inches long, is soft, drooping, often purplish, with the flower groups nodding on threadlike stalks, and the bristles 3/8 to 5/8 inch long.

DISTRIBUTION-Downy chess is a European introduction that is primarily a weed on run-down ranges, but in northern Arizona, 4,800 to 8,500 feet elevation; flowering May to July.

Copyright (c) 1972 The Arizona Board of Regents



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