kvandevere's Identifications

Link to Western Small Milkweed Bug observation: https://www.inaturalist.org/observations/209199029

Western Wallflower (Erysimum capitatum) It is a 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. Flowers are petaled, generally orange, sometimes yellow. Peak bloom: April-July. Fruit (Silique) pedicels are spreading to ascending.
Calflora lists 4 subspecies. The subspecies, Erysimum capitatum var. capitatum, that grows in Pinnacles Nat'l Park, is Endemic in California.

Calflora (with species distribution map in CA) https://www.calflora.org/app/taxon?crn=3472

Jepson eFlora Erysimum capitatum https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=25113

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