Mount Hamilton Coreopsis
(Coreopsis hamiltonii )
Photo Copyright 1994 Dean Wm. Taylor
Description: Annual herb 2-10 inches (5-25cm) tall, with 1-many upright stems. Leaves basal, divided 1-2 times into linear segments, 1mm wide. Leaves 1/4 - 3/4 inches (5-20mm) long, with leaf stems 3/8 - 1 1/8 inches (1-3cm) long. Inflorescence are solitary, radiate heads, 3/8 - 3/4 inches (1-2cm) across. Heads contain 5-8 ray flowers, and 20-30 disk flowers. Ray flowers have yellow petals, are oblong to obovate, and 1/8 - 5/16 inches (3-8mm) long. Disk flowers have yellow petals with 4-5 lobes, and are 1/8 - 3/16 inches (3-4.5mm) long. The heads also contain cylindric involucres with flat bases. Fruits are achenes, brown or tan splotched with brown, shiny, and 1/4 inch (5-6mm) long.
Habitat: Dry, exposed, rocky slopes. Elevation 1760 - 4160 feet.
Flowering Period: Blooms March - May.
Status: BLM Sensitive, California Native Plant Society List 1B