desert poppies

genus Eschscholzia

Member of poppy family (family Papaveraceae)
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.

california poppy
Eschscholzia californica

has a distinct pink disc below the corolla (receptacle rim ≥ 0.5 mm) [example]
by far the most common poppy in the bay area

tufted poppy
Eschscholzia caespitosa

has no more than an indistinct disc below the corolla (receptacle rim ≤ 0.3 mm) [example]
its recepticle slants smoothly down to the width of the stem
can be found at Pinnacles NP, but is extremely rare in the bay area

recepticle

diamond-petaled california poppy
Eschscholzia rhombipetala

has no more than an indistinct disc below the corolla
its recepticle looks comparatively bloated, as it is wide at the top before slanting down to the width of the stem
found east of Mt. Diablo, but is unknown in the rest of the bay area

2 observed taxons / 1 unobserved taxon / 1 key

Chris’s observations: 241 (237 are research grade)

Locations:

Henry Coe SP: 24
Edgewood Park & Natural Preserve: 17
Russian Ridge OSP: 16
Calero CP: 13
Monte Bello OSP: 12
Almaden Quicksilver CP: 10
Coyote Hills RP: 10
Santa Teresa CP: 10
Coyote Lake / Harvey Bear Ranch CP: 9
Fremont Older OSP: 9
Joseph D. Grant CP: 8
Sunol Wilderness RP: 8
Long Ridge OSP: 7
Rancho Cañada del Oro OSP: 6
Ed R. Levin CP: 5
Mission Peak RP: 4
Máyyan 'Ooyákma Coyote Ridge OSP: 4
Sweeney Ridge National Recreation Area: 4
Coyote Valley OSP: 3
El Corte de Madera OSP: 3
Point Lobos SP: 3
Purisima Creek Redwoods OSP: 3
San Pedro Valley CP: 3
Sierra Azul; OSP: 3
Sierra Vista OSP: 3
Skyline Ridge OSP: 3
Coyote Creek Trail: 2
Lexington Reservoir CP: 2
Pinnacles NP: 2
Pleasanton Ridge RP: 2
San Jose, CA: 2
Sibley Volcanic RP: 2
Windy Hill OSP: 2
Alum Rock Park, San Jose
Bear Creek Redwoods OSP
Castle Rock SP
Crockett Hills RP
Del Valle RP
Dry Creek Pioneer RP
El Sereno OSP
Garin RP
Garrapata SP
Golden Gate National Recreation Area
Henry Cowell Redwoods SP
Joaquin Miller Park, Oakland
La Honda Creek OSP
McNee Ranch / Montara Mountain SP
Mt. Diablo SP
Mt. Madonna SP
Mt. Tamalpais SP
Novitiate Park, Los Gatos
Pacheco SP
Pearson-Arastradero Preserve, Palo Alto
Picchetti Ranch OSP
Presidio of San Francisco
Sam McDonald CP
San Bruno Mountain State & County Park
Saratoga Gap OSP
Ulistac Natural Area, Santa Clara
Waterdog Lake & Open Space

Months:

Jan.: 6
Feb.: 19
Mar.: 47
Apr.: 50
May: 36
Jun.: 23
Jul.: 31
Aug.: 6
Sep.: 7
Oct.: 10
Nov.: 4
Dec.: 2

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Taxon info: iNaturalist – Calflora – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora