John Thomas Howell

Carex specuicola is a rare species of sedge known by the common name Navajo sedge. It is native to a small section of the Colorado Plateau in the United States, its distribution straddling the border between Utah and Arizona, and completely within the Navajo Nation. There are several populations but they are limited to a specific type of habitat. The plants grow from the sides of steep, often vertical cliffs of red Navajo Sandstone, in areas where water trickles from the rock. It occurs at elevations between 5,700 and 6,000 feet (1,700 and 1,800 m), usually in shady spots. Though it is not a

Astragalus nuttallii is a species of milkvetch known by the common name Nuttall's milkvetch. It is native to California and Baja California, where it grows in the sandy soils of coastal habitat. This is a perennial herb forming thick, tangled clumps of hairy to hairless stems up to a meter in length. The abundant leaves are up to 17 centimeters in length and made up of many oval-shaped leaflets. The inflorescence is a large, dense body of up to 125 flowers, each around 1 to 1.5 centimeters long. The flowers are dull cream-colored and sometimes purple-tinted. The fruit is an inflated legume

Opuntia galapageia is a species of cactus. It is endemic to the Galápagos Islands, part of Ecuador. Forms occurring on different islands have been treated as separate species and subtaxa of these species. Opuntia echios, Opuntia helleri, Opuntia insularis, Opuntia megasperma, Opuntia myriacantha and Opuntia saxicola are now sunk within O. galapageia.

Arctostaphylos edmundsii, with the common name Little Sur manzanita, is a species of manzanita. This shrub is endemic to California where it grows on the coastal bluffs of Monterey County.

Pogogyne clareana is a rare species of flowering plant in the mint family known by the common name Santa Lucia mint. It is endemic to Monterey, California, where it is known only from about fifty occurrences all located within the bounds of Fort Hunter Liggett, a US Army training facility. The local habitat is made up of chaparral and oak woodland with occasional vernal pools and summer-dry creek beds. This is a small, aromatic annual herb producing slender, erect stems 15 to 25 centimeters tall. Stems are topped with small but showy inflorescences containing hairy sepals and lipped,

Pogogyne abramsii is a rare species of flowering plant in the mint family known by the common name San Diego mesa mint.

Physocarpus alternans also known as dwarf ninebark and Nevada ninebark is a flowering shrub native to east California, currently found throughout Western North America. It was first described by J.T.Howell in 1931. It prefers growing on dry, rocky slopes, grows in pinyon and juniper shrublands, also found near limestone outcrops. It has been found to grow at elevations of 1800 to 3100 m above sea level. Aside from the native California specimens have been collected in Nevada, Utah, Idaho and Colorado. It flowers in June and July, producing small, white flowers.

Scalesia villosa is a species of flowering plant in the family Asteraceae. It is found only in the Galápagos Islands of Ecuador. It is threatened by habitat loss.

Phacelia dalesiana is a species of flowering plants in the family Hydrophyllaceae endemic to California. It is commonly known as Scott Mountain phacelia or Howell's phacelia. Under the synonym Howellanthus dalesianus, it was considered to be the only species in the monotypic genus Howellanthus.

Penstemon papillatus is a species of penstemon known by the common name Inyo beardtongue. The plant is endemic to California, where it is known only from the eastern Sierra Nevada and slopes to the east. It grows in rocky woodland and forest habitat types.

Nemacladus twisselmannii is a rare species of flowering plant in the bellflower family known by the common names Twisselmann's threadplant and Twisselmann's nemacladus. It is endemic to California, where it is known only from two locations in the Sierra Nevada. There is one occurrence each in Kern and Tulare Counties. This is a small annual herb forming cushions of foliage at ground level, the stems no more than a centimeter long. The hairy, spoon-shaped leaves are 2 to 3 millimeters long. The inflorescence is a headlike cluster of flowers on hairlike pedicels. The flower has hairy sepals one

Lewisia cantelovii is an uncommon species of flowering plant in the family Montiaceae known by the common name Cantelow's lewisia. It is endemic to California, where it is known from the northeastern mountain ranges from the Klamath Mountains to the northern Sierra Nevada. It grows in rocky, moist mountain habitat. This is a perennial herb growing from a short, thick taproot and caudex unit. It produces a basal rosette of thick, fleshy, blunt-tipped spoon-shaped leaves with serrated edges. The inflorescence is a very slender erect stem up to 45 centimeters (18 in) tall topped with a spreading

Eriogonum apricum is a rare species of wild buckwheat known by the common name Ione buckwheat. It is endemic to Amador County, California, in the United States.

Eriogonum ampullaceum is a species of wild buckwheat known by the common name Mono buckwheat.

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Cordylanthus nidularius is a rare species of flowering plant in the family Orobanchaceae known by the common name Mt. Diablo bird's beak.

Ceanothus gloriosus is a species of shrub in the family Rhamnaceae known by the common name Point Reyes ceanothus. It is endemic to California, where it is known from the coastline of the San Francisco Bay Area and areas north and south. It grows on seaside bluffs and the slopes of the coastal mountains. This shrub grows flat and spreading to erect, approaching two meters in maximum size. The evergreen leaves are oppositely arranged and up to 5 centimeters long, rounded to oval in shape. The edges are toothed, the teeth sometimes spine-tipped. The inflorescence is a small cluster of bright

Alternanthera filifolia is a species of flowering plant in the family Amaranthaceae. It is native to the Galápagos Islands. This plant is limited to the Galápagos, but it is common there in lowlands and coastal shrublands. It is variable in morphology, forming shrubs 0.5 to 1.5 meters tall.

Sidalcea stipularis is a rare species of flowering plant in the mallow family, known by the common name Scadden Flat checkerbloom. The plant is endemic to Nevada County in eastern California. It is known from only two occurrences on Scadden Flat in the Sierra Nevada foothills, near Grass Valley. It grows in marshy habitats.

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Phacelia quickii is a species of phacelia known by the common name Quick's phacelia.

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Phacelia inyoensis, the common name Inyo phacelia, is an uncommon species of phacelia. It is endemic to California, in Inyo and Mono Counties, often within the Inyo National Forest. It is known only from the Eastern Sierra Nevada, Inyo Mountains, and White Mountains, and valley meadows between them. It grows in meadows on alkaline soils. Description Phacelia inyoensis is an annual herb growing up to about 10 centimeters high with a basal array of lobed rounded or oval leaves on short petioles. It is glandular and coated in stiff hairs. The inflorescence is a cyme of bell-shaped flowers each

Phacelia greenei, commonly known as Scott Valley phacelia, is a species of Phacelia. It is endemic to the southern Klamath Mountains of far northern California, where it is known only from Scott Valley, a valley known for its alfalfa growing, and vicinity. It is a serpentine soils endemic growing in the coniferous forests of the mountains. This is an annual herb with a branching or unbranched erect stem reaching no more than about 15 centimeters in height. It is glandular and coated in short hairs called trichomes. The lance-shaped, smooth-edged leaves are up to 3 centimeters in length. The

Opuntia galapageia is a species of cactus. It is endemic to the Galápagos Islands, part of Ecuador. Forms occurring on different islands have been treated as separate species and subtaxa of these species. Opuntia echios, Opuntia helleri, Opuntia insularis, Opuntia megasperma, Opuntia myriacantha and Opuntia saxicola are now sunk within O. galapageia.

Opuntia galapageia is a species of cactus. It is endemic to the Galápagos Islands, part of Ecuador. Forms occurring on different islands have been treated as separate species and subtaxa of these species. Opuntia echios, Opuntia helleri, Opuntia insularis, Opuntia megasperma, Opuntia myriacantha and Opuntia saxicola are now sunk within O. galapageia.

Limnanthes bakeri is a rare species of meadowfoam known by the common name Baker's meadowfoam. It is endemic to Mendocino County, California, where it is known from only about 20 occurrences in the vicinity of Willits. It is a plant of wet, grassy habitat such as vernal pools and marshy spring meadows.

Galium parishii (Parish's bedstraw) is a species of plants in the family Rubiaceae. It is native to southern California (Inyo, San Bernardino, Riverside, Los Angeles and San Diego Counties) and southern Nevada (Clark, Nye and Lincoln Counties).

Eriogonum hirtellum is a species of wild buckwheat known by the common name Klamath Mountain buckwheat. It is endemic to the Klamath Mountains of far northern California, where it is known from only a few occurrences.

Eriogonum butterworthianum is a rare species of wild buckwheat known by the common name Butterworth's buckwheat. It is endemic to the Santa Lucia Mountains of central Monterey County, California, where it is known from a few occurrences in the wilderness southeast of Big Sur in the vicinity of Junipero Serra Peak. Its native habitats include oak and conifer woodlands, chaparral communities, and sandstone outcrops. Eriogonum butterworthianum is a small clumpy shrub or subshrub that grows up to about 30 centimeters tall and wide. Leaves are 2 centimeters long and reddish-green in color. They