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"Piperia" is a former Genus name within the orchid family Orchidaceae that has since been renamed "Platanthera" on I-Naturalist. Jepson eFlora, and all the other references listed below, still list the Genus as "Piperia"

The first annual Yadon's Rein-orchid leaves have emerged from underground tubers. I stopped counting after 100+ plants! This small Monterey Pine forest area is protected by a wooden fence enclosure between Monterey Pines RV Park and the golf course. The orchids are easily seen from outside the fence. Green basal leaves appear early Jan-Feb. Stalks, then small white flowers will appear in a few months. Peak bloom time: June-July.

Yadon's Rein-orchid. A federally endangered Callifornia native/endemic orchid that grows in two threatened plant communities--the Monterey Pine Forest and in Maritime Chaparral between north Monterey County and Palo Colorado Canyon on the Big Sur coast.

Yadon's Rein-orchid is a tall (6-8 inches), slender, "pencil-thin" plant with congested white flowers. It is similar to Elegant Rein-orchid (Piperia elegans) but it differs in its diminutive white-rimmed, green lateral petals, and the short spur, which is much shorter than those of other Rein-orchids. One unique feature of this Rein-orchid is the way the upper petals generally curve inwards like a horseshoe.

Plants of Monterey County: an Illustrated Field Key, 2nd ed., Matthews and Mitchell, pp. 330-331.

Monterey Pine Forest: Coastal California's Living Legacy, 2nd. ed., 2018, pp. 60, 64, 79.

Flora of Fort Ord: Monterey County, California, David Styer, 2019, p.227.

Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=38361

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, p. 243.

Monterey County Wildflowers https://montereywildflowers.com/orchidaceae-piperia/