Matricaria is a genus of flowering plants in the chamomile tribe within the sunflower family. Some of the species have the common name of "mayweed", but this name also refers to plants not in this genus.
Calendula officinalis, the pot marigold, common marigold, ruddles, Mary's gold or Scotch marigold, is a flowering plant in the daisy family Asteraceae. It is probably native to southern Europe, though its long history of cultivation makes its precise origin unknown, and it may possibly be of garden origin. It is also widely naturalised farther north in Europe and elsewhere in warm temperate regions of the world.
Coreopsis bigelovii is a species of flowering plant in the daisy or sunflower family, Asteraceae, with the common names Bigelow coreopsis and Bigelow's tickseed. It is endemic to California.
Hypochaeris glabra is a species of flowering plant in the tribe Cichorieae within the family Asteraceae known by the common name smooth cat's ear. It is native to Europe, North Africa, and the Middle East but it can be found on other continents where it is an introduced species and a widespread weed. It has become widespread in Africa, southern and southeastern Asia, Australia, and parts of the Americas.
Lactuca canadensis is a species of wild lettuce known by the common names Canada lettuce, Canada wild lettuce, and tall lettuce. Its true native range is not clear, but it is considered to be a native of the eastern and central parts of North America. It naturalized in the western part of the continent as well as in Eurasia.
Layia heterotricha is a species of flowering plant in the family Asteraceae known by the common name pale yellow tidytips, or pale yellow layia.
Layia jonesii is a species of flowering plant in the family Asteraceae known by the common name Jones' tidytips, or Jones' layia.
Layia septentrionalis is an uncommon species of flowering plant in the family Asteraceae known by the common name Colusa tidytips, or Colusa layia.
Coreopsis douglasii is a species of flowering plant in the family Asteraceae known by the common name Douglas' tickseed. It is native to California from Santa Clara County to San Diego County, as well as from Mohave County in Arizona.
Eriophyllum ambiguum is a species of flowering plant in the family Asteraceae known by the common name beautiful woolly sunflower. It is native to the deserts and adjacent hills of southern and eastern California, northwestern Arizona, and southern Nevada.
Lessingia glandulifera is a species of flowering plant in the family Asteraceae known by the common name valley lessingia. It is native to California and Baja California, where it grows in several types of habitat, from forest and desert to the coastline. This is an annual herb varying in maximum size from under 10 to nearly 80 centimeters in height, growing erect to decumbent. It is hairless to very hairy and glandular. The leaves are widely lance-shaped and toothed, the lowest approaching 11 centimeters in maximum length. The upper leaves are often studded with knobby glands. The flower heads appear singly at the tips of the stem branches. Each head is lined with phyllaries covered in large glands and sometimes many hairs. The head is discoid, containing no ray florets but many funnel-shaped disc florets with lobes that resemble ray florets. The disc florets are yellow with brown throats. The fruit is an achene with a whitish pappus.
Kyhosia is a monotypic genus of flowering plants in the family Asteraceae containing the single species Kyhosia bolanderi, which is known by the common names Bolander's madia and kyhosia.
Harmonia hallii is a species of flowering plant in the family Asteraceae known by the common names Hall's harmonia and Hall's madia.
Raillardella argentea is a species of flowering plant in the family Asteraceae known by the common name silky raillardella. It is native to the Sierra Nevada and nearby mountain ranges of California, its distribution extending east into Nevada and north along the Cascade Range and Klamath Mountains into Oregon. It grows in many types of dry, open mountain habitat. It is a rhizomatous perennial herb growing in a clump of rosetted basal leaves. The leaves are lance-shaped, up to 8 centimeters long, and coated in silky hairs. The plant produces an inflorescence up to about 15 centimeters tall consisting of a solitary flower head which is cylindrical to somewhat bell-shaped. The head is enclosed in the fused outer scales of the flowers, which look similar to the phyllaries of many other species' flower heads. The head contains many yellow disc florets up to a centimeter long each, and no ray florets. The fruit is a long, narrow achene which may be 2 centimeters in length including its plumelike pappus.
Sanvitalia abertii is a species of flowering plant in the family Asteraceae known by the common names Abert's creeping zinnia and Abert's sanvitalia. It is native to the southwestern United States and northern Mexico, where it grows in desert scrub, desert mountains and woodlands. It is an annual herb somewhat variable in appearance. The mainly erect stem may be 2 to 29 centimeters tall, and simple or with many branches. The linear or lance-shaped leaves are a few centimeters long. The plant is coated in rough hairs. The inflorescence is a cyme of flower heads with thick, leathery yellow ray florets 2 or 3 millimeters long and notched at the tips. The fruit is an achene. Achenes arising from the ray florets are light-colored and tipped with pappi, while those from the disc florets at the center of the flower head are darker and lack pappi.
Sonchus tenerrimus is a species of flowering plant in the family Asteraceae known by the common name slender sowthistle. It is native to the Mediterranean region of southern Europe, northern Africa, and the Middle East. It has been found as well in several other locations around the world, historically in association with ship ballast in coastal regions. It has become naturalized in a few places, such as California in the United States and Baja California in Mexico.
Sphaeromeria cana is a species of flowering plant in the family Asteraceae known by the common name gray chickensage. It is native to the western United States, where it is known from the Sierra Nevada, the adjacent desert ranges of eastern California and Nevada, and Steens Mountain of Oregon. It grows in dry, rocky mountain habitat, such as cracks and crevices, including the talus above the tree line. This is an aromatic subshrub with numerous erect branches growing up to 30 to 60 centimeters tall. It is gray-green in color and coated with woolly fibers. The leaves are linear or lance-shaped, the lower ones divided into lobes. The inflorescence is generally a cluster of flower heads lined with woolly phyllaries and containing yellow disc florets. There are no ray florets. The fruit is a ribbed achene about 2 millimeters long.
Urospermum picroides is a species of flowering plant in the family Asteraceae known by the common name prickly goldenfleece. It is native to Eurasia and it is known as an introduced species in many other regions, including North and South America, Australia, and southern Africa. It grows as a common weed in disturbed habitat. This annual herb grows up to 30 to 50 centimeters tall. It is coated in long hairs and bristles. The bristly leaves are variously shaped, often divided into many sharp-toothed lobes. The inflorescence bears flower heads on thick peduncles. The head is 1 to 2 centimeters long or more and filled with yellow ray florets. It is enveloped in several pointed phyllaries which are covered in bristly hairs. The fruit is an achene well over a centimeter in length which is tipped with a pappus of bristles.
Wyethia glabra is a species of flowering plant in the family Asteraceae known by the common name Coast Range mule's ears. It is endemic to California, where it grows in the North and Central Coast Ranges. It is a perennial herb growing from a tough taproot and caudex unit and producing a stem up to 40 centimeters tall. It is hairless to hairy and glandular. The leaves have lance-shaped or oval blades up to 45 centimeters long. The inflorescence is usually a solitary flower head or occasionally a cluster of 2 or more. The head has lance-shaped leaflike phyllaries at the base. It contains up to 21 yellow ray florets each up to 5 centimeters long and many yellow disc florets. The fruit is an achene over a centimeter long, including its pappus.
Heliopsis parvifolia is a North American species of flowering plant in the family Asteraceae, known by the common name mountain oxeye.
