Platystemon is a monotypic genus of flowering plants in the poppy family containing the single species Platystemon californicus, which is known by the common name creamcups. It is native to Oregon, California, Arizona, Utah and Baja California, and is found in open grasslands and sandy soils below 6,000 feet (1,800 m) elevation.
Calochortus amabilis is a species of the genus Calochortus in the family Liliaceae. It is also known by the common names Diogenes' lantern, yellow globe-tulip, golden globe-tulip, yellow globe lily, golden fairy lantern, golden lily-bell, Chinese lantern, and short lily.
Eriogonum gracile is a species of wild buckwheat known by the common name slender woolly buckwheat.
Porophyllum gracile is a species of flowering plant in the family Asteraceae known by the common names odora and slender poreleaf. It is native to northern Mexico and the southwestern United States from California to Texas, where it can be found in rocky and sandy desert scrub habitat.
Potentilla wheeleri is a species of cinquefoil known by the common name Kern cinquefoil or Wheeler's cinquefoil. It is native to the Sierra Nevada and nearby ranges of California and it has been reported from Arizona and Baja California. Its habitat includes moist areas in mountainous regions. This tuftlike plant produces spreading, decumbent stems with leaves sometimes arranged in a rosette about the caudex. The hairy stems reach a maximum length near 25 centimeters. The rough-haired leaves are palmate, each divided into five wedge-shaped leaflets which are lined or tipped with teeth. The inflorescence is a cyme of several flowers with yellow petals each a few millimeters long.
Ranunculus flabellaris is a species of flowering plant in the buttercup genus, Ranunculus, known by the common name yellow water buttercup. It is native to much of North America, including the southern half of Canada and most of the United States.
Rorippa columbiae is a species of flowering plant in the family Brassicaceae known by the common names Columbian yellowcress and Columbia yellow cress.
Silene hookeri is a species of flowering plant in the family Caryophyllaceae known by the common names Hooker's silene, Hooker's catchfly, Hooker's Indian pink, and Hooker's glandular campion.
Silene lemmonii is a species of flowering plant in the family Caryophyllaceae known by the common name Lemmon's catchfly.
Silene occidentalis is a species of flowering plant in the family Caryophyllaceae known by the common names western catchfly and western campion.
Stanleya viridiflora is a species of flowering plant in the family Brassicaceae known as green princesplume and green-flowered prince's plume. It is native to the western United States, where it occurs in sagebrush and plateau habitat, often on rocky calcareous, sandstone, clay, shale, or volcanic soils.
Streptanthus barbatus is a species of flowering plant in the mustard family known by the common name Pacific jewelflower. It is endemic to the southern Klamath Mountains of far northern California, where it occurs in open wooded habitat among Jeffrey Pines, generally on serpentine soils. It is a perennial herb producing a decumbent or erect, sometimes branching stem up to 70 to 90 centimeters long. It is hairless except for some light hairs on the flowers and the bases of the leaves. The largest leaves are at the base of the plant. They are oval with faintly toothed, bristly edges and borne on short petioles. Leaves above these are oval to rounded and may clasp the stem. Flowers occur at intervals along the upper stem. Each has a spherical to urn-shaped calyx of keeled sepals under a centimeter long with curving petals barely emerging from the tip. The calyx of sepals is whitish, darkening purple in maturity. The petals are purple. The fruit is a long, flat, curving silique which may be 7 centimeters in length.
Streptanthus diversifolius is a species of flowering plant in the mustard family known by the common name variableleaf jewelflower, or varied-leaved jewelflower. It is endemic to California, where it is limited to the Sierra Nevada foothills. It is a resident of woodlands and other foothill habitat. It is an annual herb producing a hairless, waxy stem up to a meter tall. The basal leaves are variable in shape and are often divided into narrow, threadlike segments. Leaves higher on the stem are also variable, having round to lance-shaped blades which clasp the stem at their bases. Flowers occur at intervals along the upper stem, with one or two leaflike bracts at the base of the raceme. Each flower has an urn-shaped calyx of keeled sepals about half a centimeter long and white, yellowish, or purple in color, sometimes with white edging. White, purple-veined petals emerge from the tip. The fruit is a thin, flat, curving silique which may be 8 or 9 centimeters in length.
Streptanthus howellii is an uncommon species of flowering plant in the mustard family known by the common name Howell's jewelflower.
Streptanthus insignis is an uncommon species of flowering plant in the mustard family known by the common names plumed jewelflower and San Benito jewelflower. It is endemic to California, where it is known only from the Inner Central Coast Ranges. It grows in grassland and chaparral habitat, usually on serpentine soils. It is an annual herb producing a hairy, bristly, branching stem up to about 60 centimeters long. The lance-shaped basal leaves are borne on short petioles. Leaves midway up the stem are longer, and those near the top are shorter. They sometimes clasp the stem at their bases. Flowers occur at intervals along the upper stem. The uppermost flowers are often sterile and different in form. Each fertile flower has a bell-shaped calyx of sepals which is purple or greenish-yellow depending on subspecies. The petals at the tip are purplish or yellowish, also depending on subspecies. The fruit is a flat, straight silique which may be over 11 centimeters long.
Streptanthus longisiliquus is a species of flowering plant in the mustard family known by the common name long-fruit jewelflower. It was first described to science in 2007. It is endemic to northern California, where it is known from Butte, Tehama, and Shasta Counties. It can be found in forest and woodland habitat in mountains and foothills. It is a short-lived perennial herb producing a few-branched stem up to 1.2 to 1.5 meters in maximum height. It is mostly hairless except for some light hairs on the inflorescences and sometimes the leaf petioles. The basal leaves have oval or spoon-shaped blades up to 10 centimeters long, usually with smooth edges. Leaves higher on the stem are oval or oblong and lack petioles, their bases often clasping the stem. Flowers occur at intervals along the upper stem. Each flower has a bell-shaped calyx of sepals which yellow-green at the base and purplish at the tip, measuring under a centimeter in length. The petals emerging from the end are brownish or purplish with greenish bases. The fruit is a flattened, curving silique that can be quite long even for the genus, measuring up to 15 centimeters in length.
Streptanthus tortuosus is a biennial or short lived perennial plant in the mustard family (Brassicaceae) known by the common names shieldplant, shieldleaf, and mountain jewelflower.
Thelypodium brachycarpum is a species of flowering plant in the mustard family known by the common names shortpod thelypody and short-podded thelypodium. It is native to parts of northern California and southern Oregon, where it grows in several types of habitat, including alkaline wetlands and serpentine soils.
Thelypodium crispum is a species of flowering plant in the mustard family known by the common name crisped thelypody.
Thelypodium integrifolium is a species of flowering plant in the mustard family known by the common names entireleaved thelypody and foxtail thelypodium. It is native to much of the western United States, including the Great Basin and surrounding plateaus and deserts.
