Albert Michael Powell

Coreopsideae is a tribe of flowering plants belonging to the Asteroideae subfamily. It includes widely cultivated genera such as Coreopsis, after which the tribe is named, as well as Cosmos and Dahlia. A similar group has been recognized since 1829, generally as part of the tribe Heliantheae (Cassini, 1819). In the late 20th century, molecular studies caused a slightly redefined version of this group to be recognized as its own tribe, Coreopsideae. The larger version of Heliantheae was split into tribes including Bahieae, Chaenactideae, Coreopsideae, Helenieae and, finally, Heliantheae (sensu

Viola guadalupensis, the Guadalupe Mountains violet, is a perennial yellow-flowered violet, and is an extremely rare endemic plant of the Guadalupe Mountains. The violet is known only from Guadalupe Mountains National Park, where it grows at high elevations on vertical limestone faces. The Guadalupe Mountains violet was first described in 1990 when it was found at one location along the East Rim of Frijole Ridge. A second, isolated population was found in 2006 in a steep, slot-canyon drainage about 2 km from the first colony, and two additional populations of the violet were found in the park

Laphamia inyoensis (synonym Perityle inyoensis), known by the common names Inyo rockdaisy and Inyo laphamia, is a rare species of flowering plant in the aster family. It is endemic to Inyo County in eastern California. It is known from just 10 populations in the southern Inyo Mountains, at elevations of 1,800–2,710 metres (5,910–8,890 ft). Its habitat is dry, rocky mountain slopes, often in limestone.

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Flaveria sonorensis is a rare Mexican plant species of Flaveria within the family Asteraceae. It has been found only in southern Sonora and southwestern Chihuahua in northwestern Mexico. Some of the populations lie very close to hot mineral springs. Flaveria sonorensis is a perennial herb up to 100 cm (39 in) tall. Leaves are long and narrow, up to 14 cm (5.5 in) long. One plant will produce numerous small flower heads in flat-topped clusters, each head with 5-7 disc flowers and sometimes a single ray flower.

Flaveria cronquistii is a rare Mexican plant species of Flaveria within the family Asteraceae. It has been found only in the States of Puebla and Oaxaca in central Mexico. Flaveria cronquistii is a shrub up to 170 cm (68 inches or 5 2/3 feet) tall. One plant can produce numerous small flower heads in loose, branching arrays. Each head contains about 7 disc flowers but no ray flowers.

Flaveria brownii, or Brown's yellowtops, is a North American plant species of Flaveria within the family Asteraceae. It is found only in the coastal regions of southern Texas in the United States. It grows primarily in sand dunes and salt marshes. Flaveria brownii is a perennial herb up to 70 cm (27.5 in) tall. Stems sometimes grow straight up, sometimes reclining on the ground. Leaves are long and narrow, up to 12 cm (4.5 in) long. One plant can sometimes produce 100 or more flower heads in a loose, branching array, each head with 5-10 yellow disc flowers. Sometimes the head also contains

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