Lastenia conjugens is commonly known

Lastenia conjugens is commonly known as Contra Costa Goldfield. This plant grows up to 40 cm tall. It produces simple or freely branched stems. Their hairless leaves grow up to 8 cm long; they come either with entire margins or with to pinnate lobs.
The flower head is formed of 12-18 bracts fused at 1/3 to less than middle of length. This is the major distinctive feature to identify this species. The yellow-colored ray flowers are made of 6-13 petals, the ligules come in yellow having 5-10 mm. The yellow disk flowers are multiple, and anther tops are linear to ovate-shaped.
The corolla is usually made of 5 lobs. The flowers are followed by club-formed fruits, lacking any hairs. They are blackish or gray, having the width of about 1.5 mm.
This spring-flowering plant is quite uncommon and is valued by its outstanding appearance.