Jens Clausen

Viola tomentosa is a species of violet known by the common names feltleaf violet and woolly violet. It is endemic to the central Sierra Nevada of California, where it occurs in various types of dry mountain forest habitat. This small herb grows from a deep taproot, reaching a maximum height of 5 to 10 centimeters. The herbage is coated with woolly hairs. The leaves have oval blades borne on petioles a few centimeters long. A solitary flower is borne on a short upright stem. It is under a centimeter long with five yellow petals. The lower three petals are veined with dark brown and the upper

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Madia gracilis is a species of flowering plant in the family Asteraceae known by the common names grassy tarweed, slender tarweed, and gumweed madia.

Holocarpha obconica, commonly known as the San Joaquin tarweed, is a North American plant species in the sunflower family. It is endemic to (found only in) California, primarily in the Central Valley and adjacent regions. The epithet "obconica" means "obconical," in other words, shaped like a cone, but with the widest part furthest from the base. Achenes of H. obconica are obconical. The plant is a resin-containing herb up to 120 cm (4 feet) tall. It produces numerous flower heads, each head containing 4–9 yellow ray flowers surrounding 11–21 small yellow disc flowers, the disc flowers having

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