Abronia latifolia (coastal or yellow sand-verbena)

Family: Four o'clock

Characteristics
Perennial with fragrant yellow flowers in bloom except in the coldest months. Flowers have no petals. Sticky foliage usually sprinkled with sand. Bears a small, winged fruit. Grows in succulent mats.

Area
Sandy beaches. 

Other
Edible roots.

Raphanus sativus (wild radish)

Color: White. Cream. Pale yellow. Pink. Faded purple.

Description: Mustard Family. Annual. Grows as high as 3 ft. Much branched and loaded with blossoms. Each petal with dark purple veins. Pods do not split open and are slightly constricted between the seeds. 

Location: Roadsides, pastures, vacant lots. Pt. Reyes. 

Other: Ancestor of cultivated radish.

Brassica kaber (wild mustard)

Color: Yellow

Description: Mustard Family. Annual. Grows with wild radish (Raphanus sativus). Flattish pods.

Location: Roadsides, pastures, vacant lots. Pt. Reyes.

Platystemon californicus (cream cup)

Color: Cream and yellow.

Description: Poppy Family. Annual with dull green foliage of straplike leaves. Stems and flower buds with spreading white hair. Cream petals shaded to a light yellow at the central mass of stamens.

Location: Sunny places. Old pastures. Grassy headlands. Pt. Reyes.