Charles John Sheviak

Spiranthes infernalis, common name Ash Meadows lady's tresses, is a rare species of orchid known from only four locations in Nevada, all close to one another. The type locale is inside Ash Meadows National Wildlife Refuge, in Nye County approximately 90 miles (140 km) WNW of Las Vegas. The site is a seasonally wet meadow. The epithet infernalis means "of the underworld" or "of the nether regions", in reference to the extremely hot climate of the region.

Spiranthes magnicamporum, commonly called the Great Plains lady's tresses, is a species of orchid that is native to North America. It is primarily native in the Great Plains, but there are outlying populations in the east in areas of former natural grassland, such as the Black Belt prairies of the Southeast. It is found in both fens and wet and dry prairies, often in calcareous soil.

Spiranthes diluvialis is a rare species of orchid known as Ute lady's tresses (also, Ute ladies'-tresses). The species name diluvialis means "of the flood". It is native to the western United States, where there are scattered, mostly small occurrences in the states of Colorado, Idaho, Montana, Nebraska, Nevada, Utah, Washington, and Wyoming. Two occurrences were discovered in southern British Columbia in 2006. The plant faces a number of threats to its existence. It is a federally listed threatened species of the United States but was proposed for delisting in 2025.

Spiranthes delitescens is a rare species of orchid known by the common names reclusive lady's tresses, Canelo Hills lady's tresses, and Madrean lady's tresses. It is native to Arizona in the United States, where there are only four occurrences. It is threatened by the loss and degradation of its habitat. It is a federally listed endangered species of the United States. This orchid was first collected in 1968 and described to science as a species in 1990. It produces an erect stem up to 50 centimeters tall. The narrow leaves are arranged around the lower part of the stem and are up to 18

Platanthera yosemitensis, the Yosemite bog orchid, is a species of orchid that is endemic to nine wet montane meadows between the main stem and the South Fork of the Merced River in Yosemite National Park. First collected in 1923, it was not recognized as a distinct species until 2007. The species grows at altitudes of 1,800–2,700 m (5,900–8,900 ft). The orchid has a foul smell that has variously been described as "corral of horses, asafetida, strong cheese, human feet, sweaty clothing, or simply disagreeable". The orchid's yellow flowers are less than 8 mm (1⁄4 in) wide, and are pollinated

Platanthera tescamnis, the intermountain bog orchid or yellow rein orchid, is a species of orchid described in 2006. The plant is well-known but had been misidentified. It is native to the Great Basin and Colorado Plateau of the western United States (Colorado, Utah, Arizona, Nevada, California), where it grows in warmer, drier habitat than most related orchids. Platanthera tescamnis produces a slender, erect flowering stem which may exceed one meter (3 ft 3 in) in height. There are several leaves around the base of the stem, lance-shaped to oval and measuring up to 29 centimeters (11 in)

Platanthera purpurascens, the purple petal bog orchid, is a terrestrial orchid of North America.

Platanthera praeclara, known as the western prairie fringed orchid and the Great Plains white fringed orchid, is a rare and threatened species of orchid native to North America.

Platanthera aquilonis, the northern green orchid or north wind bog orchid, is a species of self-fertilizing orchid native to the United States and Canada with a widespread distribution across the two countries.

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Spiranthes perexilis, the languid ladies’-tresses, is a species of orchid native to California and Oregon.