An Illustrated Guide to ARIZONA WEEDS

The University of Arizona Press

SAND PEPPERGRASS

Illustration

MUSTARD FAMILY-Cruciferae

SAND PEPPERGRASS-Lepidium lasiocarpum Nutt.

DESCRIPTION-Bushy annual, 1 inch to 1 1/4 feet high, reproducing only by seeds. The stems are erect or prostrate, usually profusely branched from the base, with short stiff straight hairs lying flat on the surface, or with rather long stiff bristly spreading hairs. The leaves, 1 to 6 inches long including the stalks, are alternate, broader toward the tip, and may be merely toothed, deeply lobed, or cut into very fine segments. They often drop off as the plant matures.

The petals are tiny and white, less than 1/12 inch long, but are often lacking completely. The rounded.seedpods, notched at the tip, are covered with short bristly hairs, or sometimes are hairy only along the edges, 1/8 to l/6 inch long, and about 1/8 inch broad. Their stalks are not rounded, but noticeably flattened, hairy on both sides, or hairless on the lower surface. They contain only 2 seeds, 1 in each half of the pod. The reddish oval seeds have a membranous margin, narrow all around the edge, but wider at the top.

DISTRIBUTION-Sand peppergrass, a native plant, is abundant throughout the state in the northern as well as the southern part, in sandy or rocky disturbed soil along roadsides, in fields, pastures, waste places, eroded hillsides on overgrazed ranges, mesas, washes, and river bottoms; 100 to 6,500 feet elevation; flowering January to June, but mostly March and April.

Copyright (c) 1972 The Arizona Board of Regents



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