An Illustrated Guide to ARIZONA WEEDS

The University of Arizona Press

SCARLET MORNINGGLORY, red morningglory, starglory




DESCRIPTION-All species of morningglory are declared prohibited noxious weeds in Arizona. Scarlet morningglory is a hairless annual with ridged, often reddish stems, twining or trailing on the ground, which reproduces only by seeds. The alternate leaves, on stalks 1 to 4 inches long, are of 2 principal shapes. On some plants they are unlobed, with the base deeply heartshaped and the tip conspicuously long pointed, 1 1/2 to 2 1/2 inches long. On other plants (var.hederifolia), some or all of the leaves are deeply cut into 3 to 5 fingerlike lobes.

The scarlet red flowers easily separate scarlet morningglory from all other Arizona species. (Others are pink, purple, blue, or white.) The flowers are narrowly trumpetshaped, 1 to 1 1/4 inches long, and ]/2 to 2/3 inch across. Two to several flowers are borne on a stalk 3 to 5 inches long, arising from the leaf axils. The globeshaped seedpods contain 4 to 6 blackish seeds. These are plump, somewhat eggshaped but angular, l/8 inch or slightly more long.

DISTRIBUTION-Scarlet morningglory is native in Arizona, New Mexico, and in tropical America. It is a pest in cotton fields and other commercial croplands in southeastern Arizona, from Apache to Coconino county and southward. Particularly troublesome in Graham County (around Safford and Thatcher) and in Santa Cruz County. Often found along roadsides, ditches, sandy washes, hillsides, and canyons; 2,000 to 7,000 feet elevation; flowering May to October.

All species of morningglory are serious in cotton fields after the cultivating period is over. They grow unchecked then, and wind about the plant, the flower, and the boll.

Copyright (c) 1972 The Arizona Board of Regents

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