Trans-Pecos Thinblehead
Hymenothrix wislizeni
On a flood zone adjacent to Pantano Wash, Tucson, Arizona. 28 Aug. 2016.
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FLOWERS:
Heads consist entirely of yellow rays and yellow disc florets. Blooms mid to late summer depending on summer rainfall.
ANNUAL HERB: In some cases plants may take two seasons to mature. Mostly plants germinate with the start of summer rains and grow
rapidly to flower by late summer or early fall.
LEAVES: The leaves are divided into about two dozen narrow segments arranged like a fan.
FRUIT: Seeds are topped with a crown of about 12 translucent pales.
RANGE: A fairly common plant in upland Sonoran Desert along the southeastern areas
mostly in deep sandy soil.
UNARMED: Plant is without thorns.
