Potentilla tweedyi | |
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In central Washington, USA | |
Scientific classification ![]() | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Rosales |
Family: | Rosaceae |
Genus: | Potentilla |
Species: | P. tweedyi |
Binomial name | |
Potentilla tweedyi (Rydb.)J.T.Howell | |
Synonyms | |
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Potentilla tweedyi, also known as Tweedy's mousetail and Tweedy's ivesia, is a species of perennial herb in the rose family. [1] It is native to the Pacific Northwest in the United States, from Washington east to westernmost Montana.
This species was first described as Ivesia tweedyi in 1908 by Per Axel Rydberg, who named it in honor of Frank Tweedy, the first to collect it. [2] Tweedy's specimen, the holotype, is deposited at the New York Botanical Garden Steere Herbarium. [3]
Aven Nelson and James Francis McBride reclassified Ivesia tweedyi as Horkelia tweedyi in 1916, but this name was not generally accepted. Botanist John Thomas Howell transferred Tweedy's mousetail to Potentilla tweedyi in 1945, [4] however this change was not widely accepted for many years.
Potentilla tweedyi is a perennial herb to 20 cm (7.9 in) from a stout taproot. It has finely-dissected, pinnate basal leaves which often lie somewhat flat, appearing to radiate from the central root crown. The reddish or purplish stems are glandular and usually finely hairy above, each with 1 to 3 small leaves and topped with a cluster of several flowers. Each flower has five yellow petals surrounded by a shallow bowl-shaped hypanthium. [5]
Potentilla tweedyi is similar to Potentilla gordonii , with which it cooccurs in the Pacific Northwest. However, the latter is much more widespread. The finely-dissected flat-lying basal leaves of Tweedy's ivesia are a useful distinguishing character. [5] Also, its petals are oblanceolate or spoon shaped (spatulate) or even broadly obovate, and wider than the petals of I. gordonii, which are narrowly lanceolate or narrowly spatulate at most. [6]
The "mousetail" in the common name refers to the cylindric arrangement of the many small leaflets around the leaf rachis. [7]
Potentilla tweedyi is endemic to the Pacific Northwest in the United States, growing in central and northeastern Washington, northern Idaho, and northwestern-most Montana (Mineral County). [8] [9] [10] It grows on dry, gravelly to rocky flats, slopes, alpine ridges, and in subalpine conifer woodlands. It is notable for its occurrence on serpentine. [6] [9] [10]
Tweedy's ivesia is ranked G4, i.e., apparently secure overall. It is of state conservation concern in Idaho. [11]
Per Axel Rydberg gave the species epithet tweedyi in honor of Frank Tweedy, who made the first collection, in the Yakima area of Washington Territory in 1883. [3] At that time Tweedy was working as a topographer on the Northern Transcontinental Survey. [12]
Tweedy's ivesia is suitable for rock gardens. It does best in dry sunny spots "with a good rock to cover the taproot". [13]
Arnica is a genus of perennial, herbaceous plants in the sunflower family (Asteraceae). The genus name Arnica may be derived from the Greek arni, "lamb", in reference to the plants' soft, hairy leaves. Arnica is also known by the names mountain tobacco and, confusingly, leopard's bane and wolfsbane—two names that it shares with the entirely unrelated genus Aconitum.
Luetkea is a genus of herbaceous plants in the family Rosaceae. One species is accepted. Luetkea pectinata is a mat-forming semi-shrub. It is endemic to the cold portions of western North America occurring in subarctic Alaska, Yukon, western Northwest Territories, and subalpine to alpine regions of British Columbia, southwestern Alberta, Washington, Oregon, Idaho, northern California and western Montana.
Potentilla gordonii, commonly known as Gordon's mousetail, is a species of flowering plant in the rose family. It is native to the mountain ranges of the western United States from California to Montana.
Potentilla lycopodioides, also known as clubmoss mousetail and clubmoss ivesia, is a species of flowering plant in the rose family. It is native to the Sierra Nevada and to regions east of the range in California. It may also be found beyond the state line into Nevada. There are three varieties recognised.
Potentilla saxosa, commonly known as rock mousetail and rock ivesia, is a species of flowering plant in the rose family. It is native to the mountains and deserts of central and southern California and northern Baja California, where it grows in cracks and crevices in rock faces and slopes.
Potentilla sericoleuca, commonly known as Plumas mousetail and Plumas ivesia, is a species of flowering plant in the rose family.
Crepis runcinata is a North American species of flowering plant in the family Asteraceae known by the common name fiddleleaf hawksbeard. It is native to western and central Canada, the western and central United States and northern Mexico (Chihuahua).
Lomatium cuspidatum 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.
Potentilla diversifolia or Potentilla × diversifolia is a species of flowering plant in the Rose Family (Rosaceae) known by the common names varileaf cinquefoil, different-leaved cinquefoil, and mountain meadow cinquefoil.
Arnica rydbergii is a North American species of flowering plant in the family Asteraceae, known by the common name Rydberg's arnica or subalpine arnica or subalpine leopardbane. It is native to western Canada, and the western United States.
Erigeron tweedyi, or Tweedy's fleabane, is a perennial herb in the family Asteraceae. It is native to the Rocky Mountains in Montana, Idaho and Wyoming.
Frank Tweedy (1854–1937) was an American topographer and botanist. He worked on pioneering surveys first in the Adirondacks, and then in the American West. He also made major contributions to our knowledge of the western flora and vegetation. He is perhaps best known for his studies in Yellowstone National Park.
Astragalus tweedyi, or Tweedy's milkvetch, is a perennial herb in the pea family. It is native to Washington and Oregon in the Pacific Northwest of the United States.
Plantago tweedyi, Tweedy's plantain, is a perennial herb in the plantain family. It is native to the western United States, from New Mexico and Arizona north to Montana.
Chionophila tweedyi, or Tweedy's snowlover, is a perennial herb in the plantain family. It is native to Idaho and Montana in the western United States.
Calamagrostis tweedyi, the Cascade reedgrass or Tweedy's reedgrass, is a perennial in the grass family. It is native to the Pacific Northwest in the United States, in Washington, Oregon, Idaho, and Montana.
Gilia tweedyi, or Tweedy's gilia, is an annual plant in the phlox family. It is native to the northwestern United States.
Salix tweedyi, or Tweedy's willow, is a shrub in the willow family. It is native to the northwestern United States.
Drymocallis fissa, the bigflower cinquefoil, also known as the leafy cinquefoil, leafy drymocallis, or wood beauty, is a small plant also sometimes classified as Potentilla fissa. It is a herbaceous plant with a thick taproot known for its moderately hairy leaves, redish leaf stems, and relatively large yellow flowers. It is native to foothills and lower mountains the Rocky Mountain region in the western United States.