Pittonia 1: 221. 1888.
Annuals, to 40 cm. Stems erect, branched distally, glabrous or sparsely hairy. Leaves linear, 10–80 × 1–2+ mm (simple blades or single lobes), margins entire or pinnately lobed, faces glabrous. Involucres hemispheric or obconic, 6–10 mm. Phyllaries 12–18 (connate 1/4–1/2 their lengths), ± lanceolate, puberulent to glabrate. Receptacles dome-shaped or obconic, densely hairy. Ray-florets 6–13; laminae oblong to oval, 5–10 mm. Anther appendages linear to ± ovate. Cypselae black or gray (reflective), clavate, to 1.5 mm, glabrous; pappi 0.2n = 12.
Phenology: Flowering Mar–Jun.
Habitat: Vernal pools and wet meadows
Elevation: 0–100 m
Of conservation concern.
Lasthenia conjugens often germinates under water in vernal pools; first leaves are submerged and entire; later, aerial leaves are pinnatifid.