primrose-willows

genus Ludwigia

Member of evening primrose family (family Onagraceae)
dicots (class Magnoliopsida)
flowering plants (subphylum Angiospermae)

Except for old historical records and extremely rare examples that I don't expect to encounter, there are no other wild species of this genus in the bay area.

water primrose
Ludwigia hexapetala

bracts lanceolate to lance-ovate
sepals 8–19 mm
petals 15–29 mm
Despite the Latin name, typically has only 5 petals.

floating primrose-willow
Ludwigia peploides

bracts deltate
sepals 6–14 mm
petals 9–22 mm

2 observed taxons / 1 key

Chris’s observations: 2 (1 is research grade)

Locations:

Coyote Hills RP
Vasona Lake CP

Months:

Jul.: 2

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Taxon info: iNaturalist – Calflora – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora