Ragweeds are flowering plants in the genus Ambrosia in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the Americas, especially North America, where the origin and center of diversity of the genus are in the southwestern United States and northwestern Mexico. Several species have been introduced to the Old World and some have naturalized and have become invasive species. In Europe, this spread is expected to continue, due to ongoing climate change.
John Torrey was an American botanist, chemist, and physician. Throughout much of his career, he was a teacher of chemistry, often at multiple universities, while he also pursued botanical work, focusing on the flora of North America. His most renowned works include studies of the New York flora, the Mexican Boundary, the Pacific railroad surveys, and the uncompleted Flora of North America.
Artemisia is a large, diverse genus of plants belonging to the daisy family Asteraceae, with almost 500 species. Common names for various species in the genus include mugwort, wormwood, and sagebrush.
Artemisia vulgaris, the common mugwort, is a species of flowering plant in the daisy family Asteraceae. It is one of several species in the genus Artemisia commonly known as mugwort, although Artemisia vulgaris is the species most often called mugwort. It is also occasionally known as riverside wormwood, felon herb, chrysanthemum weed, wild wormwood, old Uncle Henry, sailor's tobacco, naughty man, old man, or St. John's plant. Mugworts have been used medicinally and as culinary herbs.
Hesperocyparis arizonica, the Arizona cypress, is a North American species of tree in the cypress family Cupressaceae, native to the southwestern United States and Mexico. Populations may be scattered rather than in large, dense stands.
Heliconia collinsiana (platanillo) of family Heliconiaceae is an erect herb typically growing 10–15 feet (3.0–4.6 m) tall, native to Guatemala, Honduras, El Salvador, Nicaragua and southern Mexico.
Artemisia douglasiana, known as California mugwort, Douglas's sagewort, or dream plant, is a western North American species of aromatic herb in the sunflower family.
Artemisia ludoviciana is a North American species of flowering plant in the daisy family Asteraceae, known by several common names, including silver wormwood, western mugwort, Louisiana wormwood, white sagebrush, lobed cud-weed, prairie sage, and gray sagewort.
Ambrosia eriocentra is a North American species of ragweed known by the common names woolly bursage and woollyfruit burr ragweed.
Oreochrysum is a genus of flowering plants in the family Asteraceae.
Suaeda nigra, often still known by the former name Suaeda moquinii, is a species of flowering plant in the amaranth family, known by the vernacular names bush seepweed or Mojave sea-blite.
Elizabeth Gertrude Britton was an American botanist, bryologist, and educator. She and her husband, Nathaniel Lord Britton, played a significant role in the fundraising and creation of the New York Botanical Garden. She was a co-founder of the precursor body to the American Bryological and Lichenological Society. She was an activist for the protection of wildflowers, inspiring local chapter activities and the passage of legislation. Elizabeth Britton made major contributions to the literature of mosses, publishing 170 papers in that field.
Ambrosia deltoidea is a North American species of flowering plant in the family Asteraceae known by the common names triangle bur ragweed, triangle bursage, and triangleleaf bursage.
Brickellia ambigens is a North American species of flowering plants in the family Asteraceae. It is native to Lincoln County, New Mexico.
Centromadia parryi, the pappose tarweed, is a species of plant in the tribe Madieae within the family Asteraceae. It is found in North America where it is native to California and, northern Baja California.
Deinandra kelloggii, Kellogg's spikeweed or Kellogg's tarweed, is a North American species of plant in the tribe Madieae within the family Asteraceae. It is native to Baja California, southern and central California, and Arizona.
Ericameria parishii, or Parish's rabbitbrush, is a western North American species of flowering plants in the family Asteraceae.
Erigeron formosissimus is a North American species of flowering plants in the family Asteraceae known by the common name beautiful fleabane.
Erigeron vreelandii is a North American species of flowering plant in the family Asteraceae known by the common names sticky tall fleabane and Vreeland's erigeron. It grows in northwestern Mexico and in the southwestern United States.
Hieracium traillii is a species of hawkweed known by the common name Maryland hawkweed.
