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.
Helianthus is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. Except for three South American species, the species of Helianthus are native to North America and Central America. The best-known species is the common sunflower. This and other species, notably Jerusalem artichoke, are cultivated in temperate regions and some tropical regions, as food crops for humans, cattle, and poultry, and as ornamental plants. The species H. annuus typically grows during the summer and into early fall, with the peak growth season being mid-summer.
Palafoxia, or palafox, is a genus of North American flowering plants in the Bahia tribe within the Asteraceae.
Encelia is a genus of the plant family Asteraceae. It consists of shrubs of arid environments in southwestern North America and western South America.
Rubus leucodermis, also called whitebark raspberry or blackcap raspberry, is a species of Rubus native to western North America.
Baileya is a genus of plants in the aster family Asteraceae. All are native to the southwestern United States and to Mexico.
Helianthella, the little sunflower, is a genus of North American plants in the family Asteraceae.
Prunus fasciculata, also known as wild almond, desert almond, or desert peach is a spiny and woody shrub producing wild almonds, which is native to western deserts of North America.
Geraea canescens, commonly known as desert sunflower, hairy desert sunflower, or desert gold, is an annual plant in the family Asteraceae. The genus name comes from the Greek geraios, referring to the white hairs on the fruits.
Hulsea is a small genus of North American flowering plants in the family Asteraceae known commonly as alpinegold.
Monoptilon (desertstar) is a small genus of annual plants in the tribe Astereae within the family Asteraceae.
Geraea viscida is a species of flowering plant in the family Asteraceae known by the common name sticky geraea, or sticky desertsunflower. It is native to southern California, mainly the chaparral hills of eastern San Diego County, and nearby Baja California.
Arnoglossum diversifolium is a North American species of Arnoglossum and the sunflower family. It is native to the southeastern United States, the states of Florida, Georgia, and Alabama.
Antennaria dimorpha is a North American species of flowering plants in the family Asteraceae known by the common names low pussytoes or gray cushion pussytoes. It is native to western Canada and the western United States as far south as Riverside County in California and Rio Arriba County in New Mexico. It is generally found in dry areas. There are historical records of the species formerly occurring in northwestern Nebraska, but these populations appear now to be gone.
Baccharis salicina is a species of plant in the family Asteraceae. Common names include willow baccharis, and Great Plains false willow. It is a shrub found in North America where it grows in mildly saline areas.
Ambrosia monogyra is a species of flowering plant in the sunflower family commonly known as the singlewhorl burrobrush, leafy burrobush, slender burrobush, and desert fragrance. Ambrosia monogyra is native to North America and is typically found in canyons, desert washes, and ravines throughout arid parts of the southwestern United States and northern Mexico. This species has green, threadlike leaves that emit a distinctive odor when crushed, and flowers from August to November. The fruits have distinctive wings in their middle that aid in dispersion through wind and water.
Diaperia candida, common names silver pygmycudweed and silver rabbit-tobacco, is a plant species in the sunflower family, native to the south-central part of the United States: Texas, western Louisiana, southwestern Arkansas, southeastern Oklahoma.
Machaeranthera asteroides, the fall tansyaster, is a North American species of plants in the sunflower family. It is native to the southwestern United States and northern Mexico.
Helianthus laevigatus is a North American species of sunflower known by the common name smooth sunflower. It is native to the east-central and southeastern United States from Georgia to Maryland.
Helianthus radula is a North American species of sunflower known by the common name rayless sunflower or pineland sunflower. It is native to the southeastern United States from eastern Louisiana to South Carolina.
