Lasthenia conjugens

Greene

Pittonia 1: 221. 1888.

Common names: Contra Costa goldfields
EndemicConservation concern
Synonyms: Baeria fremontii var. conjugens (Greene) Ferris
Treatment appears in FNA Volume 21. Treatment on page 345. Mentioned on page 344.

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

Discussion

Of conservation concern.

Lasthenia conjugens often germinates under water in vernal pools; first leaves are submerged and entire; later, aerial leaves are pinnatifid.

Selected References

None.

Lower Taxa

None.