The perfectly symmetrical “pinwheel” pattern of the seeds caught my eye.
Super-long beak and red stripe on sepals (photo #10) tells me it's Mediterranean Stork's-Bill (Erodium botrys) A.k.a. Long-beaked Filaree
By INat truthseqr: How to Identify E. botrys:
https://www.inaturalist.org/projects/erodium-botrys-mediterranean-stork-s-bill/journal/61038-how-to-identify-erodium-botrys-mediterranean-stork-s-bill/
Mediterranean Stork's-Bill (Erodium botrys) A.k.a. Long-beaked Filaree, Big Heron Bill. Introduced/naturalized, common, annual plant in the Geranium (Geraniaceae) that grows 10–90 cm (up to 36 inches) tall in dry, disturbed soils. It can be semi-invasive crowding out native plants. Erodium botrys etymology: Erodium descends from the Greek word for heron, referring to the long "beaks" of the fruit. Beak (above the fruit) is the longest of the Filarees at 5-12cm (up to 4.75 inches) long. Peak Bloom Time: March-May.
Calflora (with species distribution map in CA): https://www.calflora.org/app/taxon?crn=3446
Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=25037
Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 184-185.
Flora of Fort Ord: Monterey County, California , David Styer, 2019 (includes peak bloom times) p. 131.
Monterey County Wildflowers https://montereywildflowers.com/geraniaceae-erodium/
Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016, p. 76.
Leaf Shape and Arrangement diagrams: https://upload.wikimedia.org/wikipedia/commons/e/e8/Leaf_morphology.svg
From INat Project: Erodium Mericarps and Seeds by INat truthseqr:
https://www.inaturalist.org/projects/erodium-mericarps-and-seeds
https://www.yosemitehikes.com/wildflowers/filaree/filaree.htm
"Long-Beaked Filaree (ERODIUM BOTRYS) Aliases: Long-Beaked Stork's Bill, Big Heron Bill, Broadleaf Filaree. Erodium botrys was introduced from Europe sometime in the past few hundred years - the responsible party apparently thought better of mentioning it to the newspapers - and has found the going good. The tiny pink flowers appear by the thousands in the springtime on the foothills outside Yosemite, then morph into a sort of candy-striped candelabra, and finally create a curious and unlikely mature fruit that resembles an art-deco conflagration of a spear, a corkscrew, and the Fibonacci sequence. It's lucky that the fruits are so swoopy and attractive, because they're madly in love with your socks and want nothing more than to cling to them forever and ever.
Another less common variety of filaree, ERODIUM BRACHYCARPUM, looks extremely similar to Erodium botrys. The primary distinguishing characteristic is that brachycarpum is smaller - shorter plants, smaller flowers, and shorter beaks on the immature fruits. Plants at the low end of the normal botrys size range are no larger than brachycarpum, however, which makes this somewhat suspect as a method of identification.
A third invasive filaree, ERODIUM CICUTARIUM, grows in the same habitats as Erodium botrys but is easily distinguished from it - the petals are narrower and generally have less prominent vein striping. The fruits of cicutarium and botrys are extremely similar in appearance and function: they coil when they dry out and uncoil when they get wet, and the coiling/uncoiling action helps screw the seed (the arrowhead at the tip of the fruit) into the ground.
Finally, a fourth filaree, ERODIUM MOSHATUM, looks exasperatingly similar to Erodium cicutarium. Again, you never read this. Blooms: March - June. Lifespan: Annual.
Size: The plants are usually less than a foot high, but the occasional monster specimen can surpass three feet. The flowers are typically around a centimeter in diameter (a U.S. dime, by comparison, is a little under two centimeters in diameter)."
"The fruits of Erodiums are very similar in appearance and function: they coil when they dry out and uncoil when they get wet. The coiling/uncoiling action helps screw the seed (the arrowhead at the tip of the fruit) into the ground." https://www.inaturalist.org/projects/erodium-seeds
Observed on the side of Tierra Rejada Trail.