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Clay Mariposa Lily (Calochortus argillosus) Native plant, endemic to California, growing on grassy foothills above Toro Creek, on the SE side of Fort Ord. Substrate is decomposing sandstone on a former marine terrace. Last year, there were 100 +- on this knoll, the last week of May, 2021.

Similar in appearance to Butterfly Mariposa Lily (Calochortus venustus) but
1) WITHOUT the maroon blotch/spot at outer end of petal.
2) Nectaries at base of petals are rectangular not square.
3) Hairs on nectary are Long, dark purple-maroon, not short-yellow-hairy like C. venustus.

Jepson eFlora: Clay Mariposa Lily (Calochortus argillosus)
"Stem: 40--60 cm, simple, bulblets present. Leaf: basal 20--30 cm, withering; cauline reduced upward. Inflorescence: +- umbel-like; flowers 1--4, erect; bracts 2--8 cm. Flower: perianth bell-shaped; sepals 20--40 mm; petals 20--40 mm, +- rounded, white to purple or pale yellow, central red spot within pale yellow, sparsely hairy; nectary 1 crescent or chevron, not depressed, densely short-hairy; filaments not dilated at base, anthers purple, pink to yellow-white. Fruit: erect, 4--6 cm, lanceolate. Ecology: Hard clay from volcanic or metamorphic rocks; Elevation: < 800 m. Peak bloom: April-June. Note: Flowers highly variable, generally showy."
https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76542

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016--not listed
Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015--not listed.
Flora of Fort Ord: Monterey County, California, David Styer, 2019--not listed
Monterey County Wildflowers, Trees & Ferns--not listed

See other interesting discussion/comments re the Clay Mariposa Lilly growing in this area:

https://www.inaturalist.org/observations/49858393
https://www.inaturalist.org/observations/6185354