Mildred Esther Mathias

Limnosciadium is a genus of flowering plants belonging to the family Apiaceae. Its native range is Central USA to Alabama. Species: Limnosciadium pinnatum (DC.) Mathias & Constance Limnosciadium pumilum (Engelm. & A.Gray) Mathias & Constance

Perissocoeleum is a genus of flowering plants belonging to the family Apiaceae. Its native range is Colombia to Venezuela. Species: Perissocoeleum barclayae Mathias & Constance Perissocoeleum crinoideum (Mathias & Constance) Mathias & Constance Perissocoeleum phylloideum (Mathias & Constance) Mathias & Constance Perissocoeleum purdiei Mathias & Constance

Cotopaxia is a genus of flowering plant in the family Apiaceae, comprising two species. Species Cotopaxia asplundii Mathias & Constance Cotopaxia whitei Constance & W.S.Alverson

Perideridia gairdneri is a species of flowering plant in the family Apiaceae known by the common names common yampah, Gardner's yampah and Squaw root. It is native to western North America from southwestern Canada to California to New Mexico, where it grows in many types of habitat. It is a perennial herb which grows to around .6–1 metre (2.0–3.3 ft). Its slender, erect stem grows from cylindrical tubers measuring up to 8 centimeters long. Leaves near the base of the plant have blades up to 35 centimeters long which are divided into many narrow, subdivided lobes. Leaves higher on the plant

Lomatium dissectum is a species of flowering plant in the carrot family known by the common names fernleaf biscuitroot, fernleaf desert parsley, carrotleaf biscuitroot, chocolate tips and coastal chocolate-tips

Lomatium californicum is a species of plant related to the carrot and the parsnip which is known by the common names California rock parsnip, celery weed, and California lomatium. This plant is native to California and Oregon. It is found on mountains and hills, at elevations of 150–1,800 metres (490–5,910 ft).

Lomatium bradshawii, also known as Bradshaw's desert parsley, is a perennial herb, native to Oregon and Washington. Lomatium bradshawii was thought to be extinct until 1979, when it was rediscovered by a University of Oregon graduate. Due to conservation efforts, in 2021, the U.S. Fish and Wildlife Service removed the plant from the Federal List of Endangered and Threatened Plants. This herb was common in the Willamette Valley before agricultural development and fire prevention which has allowed shrubs and weeds to invade. Most known populations of Lomatium bradshawii are within ten miles of

Perideridia oregana is a species of flowering plant in the family Apiaceae known by the common names Oregon yampah and eppaw. It is native to Oregon and California in the western United States, where it grows in woodland and other habitat. This plant is quite variable in appearance. In general, it is a perennial herb 10 to 90 centimeters tall, its green to waxy-grayish erect stem growing from a cluster of small tubers. Leaves near the base of the plant have blades 3 to 30 centimeters long divided into a variable number of leaflets, which may be subdivided into smaller segments. The

Perideridia kelloggii is a species of flowering plant in the family Apiaceae known by the common name Kellogg's yampah. It is endemic to California, where it is known from the north and central coasts, the San Francisco Bay Area, and the Sierra Nevada foothills. It grows in grassland habitat, sometimes on serpentine soils. It is a perennial herb which may reach 5 feet (1.5 meters) in maximum height, its slender, erect stem growing from a cluster of long, narrow, fibrous roots each up to 6 inches (15 centimeters) long. Leaves near the base of the plant have blades up to 18 inches (45

Neoparrya is a monotypic genus of flowering plant in the carrot family Apiaceae. Its only species is Neoparrya lithophila, also known by the common names Bill's neoparrya and rock-loving aletes. It is native to Colorado and New Mexico. This perennial plant produces a clump of herbage up to 29 or 30 centimetres (11 or 12 inches) tall. Its leaves are green, rigid, and glossy, measuring are up to 11.5 cm (4.5 in) long and divided into segments up to 3.2 cm (1.3 in) in length. The inflorescence is an umbel with up to 10 reflexed rays bearing yellow flowers. The fruit has scattered oil tubes, a

Lomatium salmoniflorum (salmonflower biscuitroot) is a perennial herb native to the northwest United States. In February and March one to nineteen umbels bloom, each with up to 300 flowers. Each flower is either strictly staminate or hermaphroditic. It has glabrous leaves that are deeply dissected into narrow blades.

Lomatium greenmanii is a rare species of flowering plant in the carrot family known by the common names Greenman's desertparsley and Greenman's biscuitroot. It is endemic to Oregon in the United States, where it is found only in the Wallowa Mountains of Wallowa County. This is a petite perennial herb with highly dissected green basal leaves each 3 to 6 centimeters long. The inflorescence is borne on a stem just a few centimeters tall. It is an umbel of tiny yellow flowers. Blooming occurs in July and August after the snow melts in its high elevation habitat. The plant grows in the subalpine

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Angelica callii is an uncommon species of angelica known as Call's angelica. It is endemic to the Sierra Nevada of California, where it grows by forest streams. This is a taprooted perennial herb producing a rough, hollow, erect stem to heights between 1 and 2 meters. The leaves are made up of highly dissected toothed leaflets each up to 13 centimeters. The inflorescence is a compound umbel with up to 50 rays bearing clusters of hairy flowers.

Tauschia stricklandii is a perennial herb in the Apiaceae family with the common name Strickland's umbrella-wort. It is a narrow endemic that is found mostly in meadows around Mount Rainier.

Tauschia glauca is a species of flowering plant in the carrot family known by the common name glaucous umbrellawort, or glaucous tauschia. It is native to the forests of Oregon and northern California, where it can often be found on serpentine soils. It is a perennial herb growing 20 to 40 centimeters tall. The leaves have blades which are divided into three-lobed leaflets and borne on long, thin petioles. The inflorescence is a compound umbel of yellow flowers with up to 12 unequal rays measuring up to 6 centimeters long each. The fruit is rounded, ribbed, and only 2 or 3 millimeters long.

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Polytaenia texana, commonly known as Texas prairie parsley, is a species of flowering plant in the carrot family (Apiaceae). It is native to Texas and Oklahoma in the United States.

Perideridia howellii is a species of flowering plant in the family Apiaceae known by the common name Howell's yampah. It is native to the mountains of Oregon and northern California, where it grows in moist soils, often near streams and rivers. It is a perennial herb which may exceed 1.5 metres in maximum height, its slender, erect stem growing from a cluster of many narrow fibrous roots measuring up to 15 centimetres long. Leaves near the base of the plant have lance-shaped blades up to half a metre long which are divided into many leaflets made up of toothed, oval segments. Leaves higher on

Neoparrya is a monotypic genus of flowering plant in the carrot family Apiaceae. Its only species is Neoparrya lithophila, also known by the common names Bill's neoparrya and rock-loving aletes. It is native to Colorado and New Mexico. This perennial plant produces a clump of herbage up to 29 or 30 centimetres (11 or 12 inches) tall. Its leaves are green, rigid, and glossy, measuring are up to 11.5 cm (4.5 in) long and divided into segments up to 3.2 cm (1.3 in) in length. The inflorescence is an umbel with up to 10 reflexed rays bearing yellow flowers. The fruit has scattered oil tubes, a

Lomatium tracyi is a species of flowering plant in the carrot family known by the common name Tracy's desertparsley, or Tracy's lomatium. It is native to the mountains of northern California and southern Oregon, where it grows in the forests on the slopes, often on serpentine soils. It is a perennial herb growing up to 35 centimeters tall from a slender taproot. There is generally no stem, the leaves and inflorescence emerging at ground level. The leaf blades are divided and subdivided into a mass of overlapping threadlike to oval segments. The inflorescence is an umbel of yellow flowers.

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Lomatium latilobum is a threatened species of flowering plant in the carrot family, known by the common names Canyonlands lomatium and Canyonlands biscuitroot. It is native to an area straddling the border between Utah and Colorado in the United States, where several of its few occurrences are within Arches National Park and Colorado National Monument. This perennial herb grows 10 to 30 centimeters tall from a caudex covered in the withered remains of previous seasons' leaves. The leaves are divided into a few pairs of lance-shaped or oval leaflets up to 1.2 centimeters wide. The

Lomatium engelmannii is an uncommon species of flowering plant in the carrot family known by the common name Engelmann's desertparsley, or Engelmann's lomatium. It is native to the Klamath Mountains of southern Oregon and northern California, where it is a member of the local serpentine soils flora.

Lomatium cuspidatum (Wenatchee desertparsley) is a perennial herb of the family Apiaceae, native to the U.S. state of Washington. It is found primarily on open rocky slopes in the Wenatchee Mountains, strongly associated with serpentine scree and soils.