hayfield tarweed

Hemizonia congesta

Member of tarweeds and allies (tribe Madieae)
white daisies
sunflower family (family Asteraceae)
dicots (class Magnoliopsida)
flowering plants (subphylum Angiospermae)

There are no other wild species of this genus anywhere.

Except for historical records that I'm ignoring, there are no other wild members of this species in the bay area.

woodrush tarweed
Hemizonia congesta ssp. luzulifolia

woodrush tarweed
Hemizonia congesta ssp. luzulifolia

leaves short-hairy, ± shaggy, or silky-hairy

hairs at margins not notably longer on distal leaves

heads in panicle-like cluster
phyllaries 3.5–6.5 mm long, with tips generally shorter than bodies
rays white

congested-headed hayfield tarplant
Hemizonia congesta ssp. congesta

leaves ± shaggy

hairs at margins often longer on distal leaves

some or all heads generally in tight groups
phyllaries 6–10 mm long, with tips longer than bodies
rays white

yellow hayfield tarplant
Hemizonia congesta ssp. lutescens

rays yellow

1 observed taxon / 2 unobserved taxons / 1 key

Chris’s observations: 29 (27 are research grade)

Locations:

Edgewood Park & Natural Preserve: 4
Coyote Lake / Harvey Bear Ranch CP: 3
Calero CP: 2
Coyote Valley OSP: 2
Ed R. Levin CP: 2
Monte Bello OSP: 2
Mt. Madonna SP: 2
Almaden Quicksilver CP
Andrew Molera SP
El Sereno OSP
Fremont Older OSP
Joseph D. Grant CP
Máyyan 'Ooyákma Coyote Ridge OSP
Pearson-Arastradero Preserve, Palo Alto
Rancho Cañada del Oro OSP
Santa Teresa CP
Sierra Azul OSP
Sierra Vista OSP
Windy Hill OSP

Months:

Jun.: 3
Jul.: 5
Aug.: 1
Sep.: 7
Oct.: 4
Nov.: 6
Dec.: 3

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

Bay Area species: iNaturalist – Calflora