An Illustrated Guide to ARIZONA WEEDS

The University of Arizona Press

SMALLFLOWER GAURA, velvetweed

Illustration

EVENING PRIMROSE FAMILY-Onagraceae

SMALLFLOWER GAURA-Gaura parviflora Dougl.

DESCRIPTION-A tall upright annual, winter annual, or biennial from a thick taproot, reproducing only by seeds. There is 1 principal stem, 2 to 6 feet high, usually branching above the middle and covered with fine silky stiff hairs. The leaves first form a rosette on the ground. The stem leaves are alternate, nearly stalkless, lanceshaped and soft hairy, 2 to 4 inches long.

The small pink or reddish flowers with 4 petals, 1/16 to 1/12 inch long, are stalkless and crowded on long branching flower spikes at the top of the plant, 2 inches to 18 inches long. The hard woody seedpods are greenish, 1/4 to 1/3 inch long, ribbed and usually hairless, or occasionally short hairy. They are spindle- shaped, pointed at both ends, and contain 2 to 4 seeds, which are not shed at maturity.

DISTRIBUTION-Smallflower gaura is a native western weed which is common throughout Arizona in moist soil of cultivated lands, old fields, roadsides, barren areas on overgrazed flats in the higher desert grasslands or sandy river washes; 100 to 6,800 feet elevation; flowering April to October or November.

Copyright (c) 1972 The Arizona Board of Regents



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