sunflowers

genus Helianthus

Member of yellow sunflower-like flowers
sunflower family (family Asteraceae)
dicots (class Magnoliopsida)
flowering plants (subphylum Angiospermae)

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

common sunflower
Helianthus annuus

common sunflower
Helianthus annuus

phyllaries 13–25 mm long, generally 5–8 mm wide, abruptly acuminate

all others have phyllaries 1–5 mm wide, acute or gradually acuminate

leaf blade abaxially bristly
stem ± rough-hairy

california sunflower
Helianthus californicus

california sunflower
Helianthus californicus

phyllaries 10–25 mm long, generally 3–5 mm wide, generally ≫ disk

tips of outer phyllaries generally reflexed at maturity

serpentine sunflower
Helianthus exilis

serpentine sunflower
Helianthus exilis

phyllaries 8–27 mm long, 3–5 mm wide, often ≫ disk

slender sunflower
Helianthus gracilentus

phyllaries generally unequal, 4–8 mm long, 1.5–3 mm wide, ≤ disk

3 observed taxons / 1 unobserved taxon / 1 key

Chris’s observations: 4 (2 are research grade)

Locations:

Henry Coe SP
Henry Cowell Redwoods SP - Fall Creek Unit
Santa Teresa CP
Saratoga, CA

Months:

Dec.: 1
Jan.: 0
Feb.: 0
Mar.: 1
Apr.: 0
May: 1
Jun.: 0
Jul.: 1

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Taxon info: iNaturalist – Calflora – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora