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Bright pink Spineflowers growing at about 2100 feet elevation in mountainous grassland. Link to nearby
Pink Spineflower (Chorizanthe membranace) observation for comparison: https://www.inaturalist.org/observations/169884762

Douglas' Spineflower (Chorizanthe douglasii) Native, endemic, annual, hairy plant in the Buckwheat (Polygonaceae) family that grows 10–40 cm (up to 16 inches) tall in dry, sandy, gravelly soil. It is endemic to Monterey and San Luis Obispo Counties. The plant is common in Monterey and San Luis Obispo counties, but rare elsewhere. Leaves are mostly all basal, oblong to oblanceolate, and softly hairy. Inflorescence is dense clusters at terminal end of the (branching) stems. It has a triangular involucre with a continuous pink membrane. This pink membrane fills the space between the teeth like an umbrella. Awns are 0.5--1 mm, straight OR hooked (uncinate) at the terminal end. Peak bloom time: May-June.

Flora of Fort Ord: Monterey County, California, David Styer, 2019, p. 172.

Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 254-255.

Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=19337

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016, p. 130.

Monterey County Wildflowers– a photographic guide https://montereywildflowers.com/polygonaceae-spineflower/

Link to nearby
Pink Spineflower (Chorizanthe membranace) observation for comparison: https://www.inaturalist.org/observations/169884762

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Jepson eFlora Key to Chorizanthe
https://ucjeps.berkeley.edu/eflora/eflora_keys.php?key=11204

Knotweed Family — Chorizanthe (Spineflower) "Flowers in this family do not have separate petals and sepals. For plants like this, the term “perianth” is used to describe the flower (i.e. the calyx and the corolla together) and “perianth parts” to describe the individual elements. In spineflowers, what you mostly see are the involucres and involucral membranes. The flowers themselves are 6-lobed, usually a similar color to the involucral membranes."
Monterey County Wildflowers– a photographic guide https://montereywildflowers.com/polygonaceae-spineflower/

Comparison of 2 Spineflowers:

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Douglas' Spineflower (Chorizanthe douglasii) Native, endemic, annual, hairy plant in the Buckwheat (Polygonaceae) family that grows 10–40 cm (up to 16 inches) tall in dry, sandy, gravelly soil. It is endemic to Monterey and San Luis Obispo Counties. The plant is common in Monterey and San Luis Obispo counties, but rare elsewhere. Leaves are mostly all basal, oblong to oblanceolate, and softly hairy. Inflorescence is dense clusters at terminal end of the (branching) stems. It has a triangular involucre with a continuous pink membrane. This pink membrane fills the space between the teeth like an umbrella. Awns are 0.5--1 mm, straight OR hooked (uncinate) at the terminal end. Peak bloom time: May-June.

Flora of Fort Ord: Monterey County, California, David Styer, 2019, p. 172.

Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 254-255.

Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=19337

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016, p. 130.

Monterey County Wildflowers– a photographic guide https://montereywildflowers.com/polygonaceae-spineflower/

Link to nearby Pink Spineflower (Chorizanthe membranace) observation for comparison: https://www.inaturalist.org/observations/169884762

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COMPARED TO

Pink Spineflower (Chorizanthe membranace) Native, annual, densely hairy plant in the Buckwheat (Polygonaceae) family that grows 10–60 cm (up to 24 inches) tall on dry, sandy, rocky, gravelly slopes at higher elevations (40-1400 m.) Leaves are linear to narrowly oblanceolate, woolly above and densely tomentose underneath. Some flower heads are at terminal end of stems, others are at the stem joints. White to pink membranes connect and fill the space between the hooked teeth like an umbrella. Peak bloom time: April-July.
In comparison, Douglas' Spineflower (Chorizanthe douglasii) dense flower clusters are a brighter pink and are only found at terminal end of stems, not also at joints. Link to C. douglasii observation: https://www.inaturalist.org/observations/160015272

Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 254-255.

Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=19342

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016, p. 130.

Monterey County Wildflowers https://montereywildflowers.com/polygonaceae-spineflower/

Leaf Terminology: Simple Diagrams/Definitions: https://upload.wikimedia.org/wikipedia/commons/e/e8/Leaf_morphology.svg

Plant Identification Terminology: An Illustrated Glossary, 2nd ed., by James G. Harris and M. W. Harris, 2022.

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Jepson eFlora Key to Chorizanthe
https://ucjeps.berkeley.edu/eflora/eflora_keys.php?key=11204
Taxon Page for Chorizanthe: https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=11204

Knotweed Family — Chorizanthe (Spineflower) "Flowers in this family do not have separate petals and sepals. For plants like this, the term “perianth” is used to describe the flower (i.e. the calyx and the corolla together) and “perianth parts” to describe the individual elements. In spineflowers, what you mostly see are the involucres and involucral membranes. The flowers themselves are 6-lobed, usually a similar color to the involucral membranes."
Monterey County Wildflowers– a photographic guide https://montereywildflowers.com/polygonaceae-spineflower/