Mariola, New Mexico rubber plant
All states between Nevada and Texas
Plains, scrubland, grassland, in desert areas, from 2,000 to 6,000 feet
Obovate to ovate, usually with broad, irregular lobes. Tomentose hairy
April to November
Parthenium incanum is a small, much branched shrub, forming clusters several feet high and wide, and bearing somewhat inconspicuous flowerheads during spring and summer. It inhabits desert areas, favoring limestone soils. Leaf surfaces have a dense covering of light grey, tomentose hairs, and are dotted with tiny glands. Leaves are usually lobed; a terminal lobe and three, five or seven lateral lobes.
Flowerheads, around a third of an inch in diameter, are formed of five relatively broad, notched, white (pistillate) ray florets, equally spaced around a center of between 10 and 25 white staminate disc florets. Phyllaries are in two series of five, the lower oval-shaped, the upper more rounded. Flowerheads are borne in compact clusters (glomerules).