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.
Aptenia was a small genus of flowering plants in the family Aizoaceae, which as of January 2024 was treated as a synonym of the genus Mesembryanthemum. Species formerly placed in the genus are native to southern Africa. The genus name is from the Greek a- (not) and ptenos (winged), and refers to the wingless fruit capsules.
Potentilla truncata, commonly known as Ramona horkelia, is a species of flowering plant in the rose family. It is native to the Peninsular Ranges of southern California and northern Baja California, where it grows in the chaparral.
Bergia texana is a species of flowering plant in the waterwort family known by the common name Texas bergia. It is native to the western and central United States and northern Mexico, where it is a plant of wetlands, living in mud and moist soils along the edges of rivers and pools. This is an annual or perennial herb producing a branching, glandular, hairy stem which grows upright or trailing up to 30 centimeters long. The leaves are 2 to 4 centimeters long, mainly oval in shape and pointed, and lightly toothed along the edges. The inflorescences appear at the tips of stem branches and in the leaf axils, bearing single flowers or small clusters. Each small flower has five green sepals and five greenish white petals. Some of the flowers open, while others are cleistogamous, remaining closed and self-pollinating. The fruit is an oval capsule with many seeds in each of its five chambers.
Cirsium brevistylum is a species of thistle known by the common names Indian thistle and clustered thistle. It is native to western North America having been found in southwestern British Columbia, Washington, Oregon, Idaho, Montana, and California.
Herissantia crispa is a species of flowering plant in the mallow family known by the common names bladdermallow and curly abutilon. It is native to the tropical Americas but it can be found throughout the tropical and warmer temperate world as an introduced species and sometimes a weed. This is a perennial or sometimes annual herb growing up to about 1.5 meters in maximum stem length, usually taking a trailing or creeping form. It is coated in whitish hairs. The oval or heart-shaped leaves are up to 7 centimeters long with rippled edges. The inflorescence is a solitary flower emerging from a leaf axil, borne on a long-haired pedicel which is half erect and then jointed downward. The flower has five pale yellow oval petals each up to a centimeter long. The fruit is a lantern-like inflated sphere ribbed into segments. It is up to 2 centimeters wide, coated in long hairs, and dehiscent, each segment containing 2 or 3 black kidney-shaped seeds.
Triglochin scilloides, synonym Lilaea scilloides, is a species of aquatic plants native from western Canada to Mexico, and to western and southern South America. It has been introduced into Portugal and Spain. English names include flowering quillwort. At one time, it was the only species accepted in the genus Lilaea.
Barkleyanthus is a monotypic genus of flowering plants in the aster family, Asteraceae, containing the single species Barkleyanthus salicifolius, a plant formerly classified in the genus Senecio. It is native to North and Central America, where its distribution extends from the southwestern United States to El Salvador. Its common names include willow ragwort, willow groundsel, Barkley's-ragwort, and jarilla.
Hartmaniella sierrae, commonly known as Sierra starwort, is a species of flowering plant in the family Caryophyllaceae.
Kali paulsenii is a species of flowering plant in the amaranth family known by the common name barbwire Russian thistle. It is native to Eurasia and it is present in the American southwest as an introduced species and sometimes a weed in sandy, disturbed habitat types. It is an annual herb forming a brambly clump of intricately branched, prostrate to erect stems growing up to a meter long. The reddish stems are lined with yellow-green, thready, fleshy, or needlelike, spine-tipped leaves a few millimeters to three centimeters long. The inflorescence is an interrupted series of flowers, with one flower per leaf axil. The flower is surrounded by a disclike array of wide, winged sepals which are whitish at the tips and pinkish at the bases.
Acleisanthes nevadensis is a species of flowering plant in the four o'clock family known by the common names desert moonpod and desert wing-fruit. It is native to a section of the southwestern United States encompassing southern Nevada and adjacent corners of Utah and Arizona. One occurrence has been observed in eastern California. The plant grows in desert habitat such as scrub and rocky washes. This herb produces several spreading stems up to about 30 centimeters in maximum length, sometimes from a woody base. The stems are covered in many leaves with fleshy oval or rounded blades up to 3 centimeters long which are borne on petioles. The herbage of the plant is coated in thick, wide, white, furry hairs, interspersed with shorter, flat hairs. Some hairs are glandular. Flowers occur in leaf axils. Each is a trumpet-shaped bloom with a narrow, tubular green throat up to 4 centimeters long and a round white corolla face about a centimeter wide, sometimes tinged yellow or greenish. There are five long, protruding stamens and a long style tipped with a spherical stigma. The fruit is a ribbed, hairy body with five broad, white wings.
Silene menziesii is a species of flowering plant in the family Caryophyllaceae known by the common names Menzies' campion and Menzies' catchfly. It is native to western North America from Alaska through the western half of Canada to the southwestern United States. It can be found in many types of habitat and it is quite common in much of its range. It is variable in morphology and there are a number of varied subtaxa. In general, it is a perennial herb growing from a caudex, appearing matlike, decumbent, or erect, with stems a few centimeters to over half a meter long. It is usually hairy in texture, with upper parts bearing sticky glandular hairs. The leaves are lance-shaped, oppositely arranged in pairs, and a few centimeters in length, upper leaves usually smaller than lower. Flowers may occur in a cyme at the top of the stem, or in leaf axils, or both. Each is encapsulated in a hairy, veined calyx of fused sepals. The petals are white with two lobes at the tips. The plant is dioecious with male and female plants producing different flowers. The male and female flower types look the same externally; the stamens are reduced in female plants and the stigmas are reduced in the male.
Silene occidentalis is a species of flowering plant in the family Caryophyllaceae known by the common names western catchfly and western campion.
Silene oregana is a species of flowering plant in the family Caryophyllaceae known by the common names Oregon silene, Oregon campion and Oregon catchfly. It is native to the western United States, including the Great Basin, where it grows in habitat such as sagebrush and forests. It is a perennial herb growing from a woody caudex and taproot, sending up an erect, mostly unbranched stem which may be 70 centimeters tall. The lance-shaped leaves are up to 8 centimeters long around the caudex, and shorter farther up the stem. Flowers occur in a terminal cyme and sometimes in leaf axils. Each flower is encapsulated in a hairy, glandular calyx of fused sepals. The five petals are creamy white or pink-tinged in color and each has four to six long, fringelike lobes at the tip.
Spergularia macrotheca is a species of flowering plant in the family Caryophyllaceae known by the common name sticky sandspurry. It is native to western North America from British Columbia to Baja California, where it grows in many types of moist coastal and inland habitat, often in alkaline and saline substrates. It may be found in marshes, alkali flats, beaches, meadows, seeps, and vernal pools. It is a perennial herb producing a narrow stem up to 40 centimeters long with a woody, thickened base and taproot. They may grow erect or prostrate across the ground. It is covered in sticky glandular hairs, especially in the inflorescence. The stems are lined with fleshy linear leaves, sometimes tipped with spines. The leaves are accompanied by triangular stipules up to a centimeter long each. Flowers occur in clusters at the end of the stem as well as in leaf axils. The small flowers have five pointed sepals and five oval white to lavender-pink petals. The fruit is a capsule containing tiny reddish brown, winged seeds.
Stellaria crispa is a species of flowering plant in the family Caryophyllaceae known by the common names curled starwort and crisp starwort. It is native to western North America from Alaska south to California and Wyoming, where it grows in moist, shady habitat such as deep forests and streambanks. It is a rhizomatous perennial herb producing a mat of prostrate or trailing stems up to about 40 centimeters long. It is lined with opposite pairs of pointed oval leaves each 1 to 2 centimeters long. Single flowers occur in the leaf axils, each borne on a short pedicel. The flower has five pointed green sepals each a few millimeters long. Some flowers have one or more petals, but most lack these.
Engellaria obtusa is a species of flowering plant in the family Caryophyllaceae known by the common names Rocky Mountain chickweed, blunt-sepaled starwort, and obtuse starwort. It is the sole species in genus Engellaria. It is native to western North America, from British Columbia and Alberta to California to Colorado, where it grows in moist areas in forests and on mountain slopes.
Stellaria irrigua is a species of flowering plant in the family Caryophyllaceae known by the common names umbrella starwort and umbellate starwort. It is native to western North America from Alaska and north-western Canada to the south-western United States, as well as parts of Asia, including Siberia. It grows in subalpine and alpine climates in mountain forests and riverbanks. It is a rhizomatous perennial herb producing a slender prostrate stem up to about 20 centimeters long, sometimes forming clumps or mats. The stem is lined with pairs of oval leaves each up to about 2 centimeters long. The inflorescence is an umbel-shaped array of several flowers each on an arching or erect pedicels. The flower has five pointed green sepals each no more than 3 millimeters long. There are occasionally tiny white petals within the calyx of sepals, but these are generally absent.
Veronica anagallis-aquatica is a species of flowering plant in the family Plantaginaceae known by the common names water speedwell, blue water-speedwell,brook pimpernel.
Erythranthe hymenophylla, synonym Mimulus hymenophyllus, is a species of flowering plant in the lopseed family known by the common names thinsepal monkeyflower and membrane-leaf monkeyflower. It is native to Hells Canyon on the border between Oregon and Idaho in the United States. It has also been reported from Montana.
