An Illustrated Guide to ARIZONA WEEDS
The University of Arizona Press
WILD CELERY-Apium leptophyllum (Pers.) F. Muell.
DESCRIPTION-A slender hairless annual, the weak stems erect or spreading, 1/3 to 2 feet high, which reproduce by seeds only. The delicate alternate leaves are divided and redivided into many very narrow to threadlike segments, and are widely spaced on the stems.
The tiny inconspicuous white flowers are in small umbrellalike clusters opposite the leaves and at the top of the plant. The flattened oval to oblong seedlike fruits, 1/16 to 1/12 inch long, have 5 or 6 prominent ribs on each face.
DISTRIBUTION-Wild celery is native from southern United States to South America. It is a troublesome weed in lawns, and although annual, very persistent. Constant mowing causes it to branch often, but does not otherwise affect it. Common throughout southern Arizona and abundant in certain areas; 100 to about 5,000 feet elevation; flowering March to September.
Copyright (c) 1972 The Arizona Board of Regents