dgreenberger's Identifications

Western Wallflower (Erysimum capitatum) Native, perennial plant in the Mustard (Brassicaceae) family that grows up to 120cm (47 inches) tall on dry, rocky slopes and hillsides away from the coast. A.k.a. Douglas' Wallflower. Leaves are long and slender. Flower petals generally orange to yellow. and 4-petaled. Fruits are 4-angled. Peak bloom: April-July.

Jepson eFlora
Erysimum capitatum https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=25113
Erysimum capitatum var. capitatum: https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=58866
Endemic in California, US: native and occurs nowhere else.

Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 110-111.

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016, p. 336.

Monterey County Wildflowers– a photographic guide https://montereywildflowers.com/brassicaceae-wallflower/

Oregon Flora https://oregonflora.org/taxa/index.php?taxon=13141

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Western Wallflower is in the Mustard (Brassicaceae) family (which is a large family) "Members of the mustard family all have 4 petals and 6 stamens. Fruits in the Mustard family are of two kinds, siliques and silicles. Siliques are at least twice as long as they are wide, while silicles are less elongated. Some siliques are more or less cylindric, others (as in the Wild Radish) are noticeably fatter at the base and taper towards the tip. . ." Monterey Wildflowers https://montereywildflowers.com/brassicaceae-wallflower/

Jepson eFlora Key to Brassicaceae: https://ucjeps.berkeley.edu/eflora/eflora_keys.php?key=70 and
Taxon page/family description https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=70

Jepson eflora Key to Wallflower (Erysimum genus):
https://ucjeps.berkeley.edu/eflora/eflora_keys.php?key=10582 and
Taxon page/genus description https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=10582

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NOT

Wind Poppy (Papaver heterophyllum) Native plant with small, orange, 4-petaled flowers that grows 30-60cm tall. Peak bloom time: April-May.
Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=86377