Charles Leo Hitchcock

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Silene parryi is a species of plant in the family Caryophyllaceae known by the common name Parry's silene. Its range includes southern British Columbia and Alberta, Canada, south to Oregon and east to Colorado and western Montana, United States. It is most common from 4,000–11,000 feet (1,200–3,400 m) elevation. Silene parryi is a pubescent and glandular perennial herbaceous plant 200–400 mm (8–16 in) tall. The calyx is tubular with ten contrasting nerves, 12–16 mm (0.5–0.6 in) long. It inflates in fruit. The five-lobed flowers are white, sometimes purple or green-tinged.

Lathyrus delnorticus is an uncommon species of wild pea known as the Del Norte pea. It is native to the Klamath Mountains of southern Oregon and northern California, where it is a member of the serpentine soils flora. This is a hairless perennial herb producing a winged or flanged stem. The leaves are made up of several pairs of oval or lance-shaped leaflets, and the stipules of the leaves are wide and toothed. There are branching, coiled tendrils. The plant bears a dense inflorescence of up to 10 pea lavender-veined white flowers, each up to 1.5 centimeters wide. The fruit is a hairless

Silene invisa is a species of flowering plant in the family Caryophyllaceae known by the common names red fir catchfly and short-petaled campion. It is endemic to California, where it is known only from the southernmost Cascade Range and northernmost Sierra Nevada. It grows in the coniferous forests of the mountains.

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Silene nuda is a species of flowering plant in the family Caryophyllaceae known by the common names western fringed catchfly and sticky catchfly. It is native to the Sierra Nevada and Modoc Plateau of California, its distribution extending into Oregon and Nevada. It grows in forest, woodland, and scrub habitat, sometimes in saline soils. Silene nuda is a perennial herb growing from a thick, woody caudex and taproot, sending up one or more upright stems up to 0.5 metres (1.6 ft) tall. The largest leaves are located in tufts around the caudex, each measuring up to 15 centimeters long by 3 wide.

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Mathiasella is a monotypic genus of flowering plants belonging to the family Apiaceae. It is in the Tribe Selineae. The genus only contains one known species, Mathiasella bupleuroides Constance & C.L.Hitchc. It is native to Mexico. The genus name of Mathiasella is in honour of Mildred Esther Mathias (1906–1995), an American botanist and college professor and also Director of the UCLA Botanic garden. The Latin specific epithet of bupleuroides means "like Bupleurum" in recognition that it has visual similarities to Bupleurum, another genus of plants in the Apiaceae family, that has worldwide

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Silene clokeyi, known as Clokey's catchfly, is a species of flowering plant in the pink family. It is native to western North America.

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Draba exunguiculata is a species of flowering plant in the family Brassicaceae known by the common names clawless draba and Grays Peak draba. It is endemic to Colorado in the United States. This plant is a perennial herb forming a tight clump on the ground. It has a branching caudex and stems just a few centimeters long. It has linear or lance-shaped leaves up to 2.5 centimeters long. The undersides and sometimes the top sides of the leaf blades have tiny hairs. The inflorescence is a raceme of several flowers with yellow petals each up to 3 millimeters long. The plant can be distinguished

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