yellow star-thistle

Centaurea solstitialis

Member of star thistles (genus Centaurea)
thistles
sunflower family (family Asteraceae)
dicots (class Magnoliopsida)
yellow in flowering plants

disk flower corolla 13–20 mm
spines straw colored, 10–25 mm
stem branched distally or throughout, winged
common

Toxicity of thistle, yellow star (Centaurea solstitialis):
1 – Skin contact with these plants can cause symptoms ranging from redness, itching, and rash to painful blisters like skin burns.
3 – Ingestion of these plants is expected to cause nausea, vomiting, diarrhea and other symptoms that may cause illness but is not life-threatening.

Chris’s observations: 39 (all are research grade)

Locations:

Russian Ridge OSP: 5
Skyline Ridge OSP: 5
Sierra Azul OSP: 3
Bear Creek Redwoods OSP: 2
Monte Bello OSP: 2
Sibley Volcanic RP: 2
Sierra Vista OSP: 2
Stevens Creek CP: 2
Almaden Quicksilver CP
Alum Rock Park, San Jose
Coal Creek OSP
Crockett Hills RP
Ed R. Levin CP
Edgewood Park & Natural Preserve
El Sereno OSP
La Honda Creek OSP
Mission Peak RP
Mt. Diablo SP
Mt. Madonna SP
Máyyan 'Ooyákma Coyote Ridge OSP
Pinnacles NP
Pleasanton Ridge RP
Sanborn CP
Santa Teresa CP

Months:

Jan.: 1
Feb.: 1
Mar.: 1
Apr.: 0
May: 1
Jun.: 5
Jul.: 8
Aug.: 4
Sep.: 6
Oct.: 7
Nov.: 5

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Taxon info: iNaturalist – Calflora – CalPhotos – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora