Per Axel Rydberg

Argentina anserina (synonym Potentilla anserina) is a perennial flowering plant in the rose family, Rosaceae. It is known by the common names silverweed, common silverweed or silver cinquefoil. It is native throughout the temperate Northern Hemisphere, often on river shores and in grassy habitats such as meadows and road-sides.

Dasiphora fruticosa is a species of hardy deciduous flowering shrub in the family Rosaceae, native to the cool temperate and subarctic regions of the northern hemisphere, often growing at high altitudes in mountains. Dasiphora fruticosa is still widely referenced in the horticultural literature under its synonym Potentilla fruticosa. Common names include shrubby cinquefoil, golden hardhack, bush cinquefoil, shrubby five-finger, widdy, kuril tea and tundra rose.

Elaeagnus commutata, the silverberry or wolf-willow, is a species of Elaeagnus native to western and boreal North America, from southern Alaska through British Columbia east to Quebec, south to Utah, and across the upper Midwestern United States to South Dakota and western Minnesota. It typically grows on dry to moist sandy and gravel soils in steppes, meadows or woodland edges.

Quercus mohriana, commonly known as the Mohr oak, shin oak or scrub oak, is a North American evergreen shrub or small tree in the white oak group and is native to the south-central United States and north-central Mexico. The species epithet mohriana honors the pharmacist and botanist Charles Mohr of Alabama.

Quercus havardii (common names include shinnery oak, shin oak and Havard oak) is a deciduous, low-growing, thicket-forming shrub that occupies some two million to three million hectares (7,700 to 11,600 square miles) in the southern Great Plains of North America. Clones may reach hundreds to thousands of years old, although aboveground stems typically live only 11 to 15 years. Shinnery oak stems are usually 1 to 2 metres (3 feet 3 inches to 6 feet 7 inches) tall and codominate the plant community with mid- and tall-grasses, which are usually taller than the oaks. The specific epithet honors

Drymocallis is a genus of plants formerly (and sometimes still) included with the typical cinquefoils (Potentilla). It contains three species known or suspected to be protocarnivorous, but more cinquefoils might eventually be moved here:

Leucophysalis is a genus of flowering plants belonging to the family Solanaceae. Its native range is Canada to Western and Northern USA. Species: Leucophysalis grandiflora (Hook.) Rydb. Leucophysalis nana (A.Gray) Averett

Carex praticola is a species of sedge known by the common name meadow sedge. It is native to most of northern North America, including most of Canada and the northernmost United States. It grows in many habitat types from wet to dry, including moist mountain meadows and woodlands. This sedge produces dense clumps of stems approaching a meter in maximum height. The inflorescence is an erect or nodding cluster of several flower spikes in color light greenish or brown to white. The fruit is covered in a perigynium which is white to cream, sometimes with a coppery center, and translucent.

Petrophytum (orth. var. Petrophyton) is a small genus of plants in the rose family known as the rock spiraeas or rockmats. These are low mat-forming shrubs which send up erect stems bearing spike inflorescences of flowers. The brushy flowers are white and have many stamens and hairy, thready pistils. Rockmats are native to western North America. Species: Petrophytum caespitosum — mat rock spiraea Petrophytum cinerascens — halfshrub rockmat, Chelan rockmat Petrophytum hendersonii — Olympic Mountain rockmat

Pediomelum is a genus of legumes known as Indian breadroots. These are glandular perennial plants with palmately-arranged leaves. They have a main erect stem with inflorescences of blue or purple flowers and produce hairy legume pods containing beanlike seeds. Some species have woody roots while others have starchy tuber-like roots which can be eaten like tuber vegetables such as potatoes or made into flour. Indian breadroots are native to North America. Many species have synonymy with genus Psoralea. Selected species: Pediomelum argophyllum - silverleaf Indian breadroot Pediomelum aromaticum

Osmorhiza aristata (Chinese: 香根芹, Japanese: 藪人参) is a perennial plant belonging to the genus Osmorhiza, in the family Apiaceae. It is native to East Asia.

Drymocallis arguta, commonly known as the tall cinquefoil, prairie cinquefoil, or sticky cinquefoil, is a perennial herbaceous plant native to North America. It was formerly included with the typical cinquefoils in the genus Potentilla.

Toxicoscordion venenosum, with the common names death camas and meadow death camas, is a species of flowering plant in the family Melanthiaceae. It grows up to 70 centimetres (27+1⁄2 in) tall. Both its common names and its scientific name reference its toxic qualities. The species is native to western North America. Because its nectar is poisonous, it is mainly pollinated by the death camas miner bee.

Psorothamnus is a genus of plants in the legume family. These are shrubs and small trees. Many are known by the general common name indigo bush. Some are referred to as daleas, as this genus was once included in genus Dalea. These are generally thorny, thickly branched, strongly scented bushes. Most species bear lupinlike raceme inflorescences of bright purple legume flowers and gland-rich pods. Psorothamnus species are native to the southwestern United States and northern Mexico. The genus formerly included additional species, but was found to be paraphyletic, and genus Psorodendron was

Pseudoclappia, the false clapdaisies, is a genus of North American shrubs in the tribe Tageteae within the family Asteraceae. Species Pseudoclappia arenaria Rydb. - Texas, New Mexico, Oklahoma, Coahuila Pseudoclappia watsonii A.M.Powell & B.L.Turner - western Texas

Petrophytum cinerascens (orth. var. Petrophyton cinerascens) is a rare species of flowering plant in the rose family known by the common names halfshrub rockmat and Chelan rockmat. It is endemic to the state of Washington in the United States, where it occurs in just a few locations along the Columbia River in Chelan and Douglas Counties.

Hydropectis is a genus of Mexican flowering plants in the family Asteraceae. Species Hydropectis aquatica (S.Wats.) Rydb. - Chihuahua, Durango Hydropectis estradii B.L.Turner - Chihuahua Hydropectis stevensii McVaugh - Jalisco, Guanajuato

Hoita is a small genus of legumes containing three species. They bear attractive purple or fuchsia flowers in large inflorescences similar to those of kudzu. They are known commonly as scurfpeas or leather-roots and are closely related to the psoraleas. They are found almost exclusively in California.

Gymnolaena is a genus of Mexican flowering plants in the family Asteraceae. Species Gymnolaena chiapasana Strother - Chiapas Gymnolaena oaxacana (Greenm.) Rydb. - Oaxaca, Puebla Gymnolaena serratifolia (DC.) Rydb. - Oaxaca formerly included Gymnolaena integrifolia (A.Gray) Rydb., Synonym of Comaclinium montanum (Benth.) Strother Gymnolaena seleri (B.L.Rob. & Greenm.) Rydb., Synonym of Boeberoides grandiflora (DC.) Strother

Giliastrum is a genus of flowering plants belonging to the family Polemoniaceae.

Boeberastrum is a genus of flowering plants in the family Asteraceae. Species There are two accepted species, both endemic to the State of Baja California Sur in Mexico. Boeberastrum anthemidifolium (Benth.) Rydb. Boeberastrum litorale (Brandegee) Rydb. (often misspelled Boeberastrum littoralis) formerly included Boeberastrum concinnum (A.Gray) Rydb., Synonym of Thymophylla concinna (A.Gray) Strother

Astragalus scaphoides, the bitterroot milkvetch, is a flowering plant in the family Fabaceae, the third-largest plant family in the world. It is found only in a small area of southwest Montana and adjacent parts of Idaho and as far west as Prineville, Oregon. It grows on shallow, south-facing slopes, in semi-arid sage scrub. Astragalus scaphoides is a perennial herbaceous plant with pinnate leaves. The pale yellow flowers open in May and are visited by several species of bumblebees and solitary bees, including those from the genera Osmia and Anthophora. Plants can be found near Lemhi Pass on

Spiranthes ochroleuca, commonly called the yellow nodding lady's tresses, is a species of orchid occurring from southeastern Canada to the eastern United States.

Sphaeralcea coccinea, commonly known as the scarlet globemallow, scarlet mallow, cowboy's delight, prairie mallow, red false mallow, or simply as globe mallow is a perennial plant growing 10–30 cm tall from spreading rhizomes with a low habit. They have grayish stems with dense, star-shaped hairs and alternately arranged leaves. The leaf blades are 2–5 cm long, palmately shaped, and deeply cut, with 3–5 main wedge-shaped segments. The undersides of the leaves have gray hairs. The 1–2.5 cm wide flowers are reddish-orange and saucer-shaped, with 5 notched, broad petals, in small terminal

Rosa bridgesii is a species of rose known by the common names pygmy rose and Sierran dwarf rose. It is native to California, where it grows in the forests of the Sierra Nevada and surrounding mountains and foothills. It may also occur in Oregon. This rose is sometimes treated as a variety of Rosa gymnocarpa.

Pseudobahia is a genus of California plants in the tribe Madieae within the family Asteraceae. These plants are known generally as sunbursts. Species Pseudobahia bahiifolia (Benth.) Rydb. - Hartweg's golden sunburst (endangered) Pseudobahia heermannii (Durand) Rydb. - foothill sunburst Pseudobahia peirsonii Munz - San Joaquin adobe sunburst (threatened)

Psathyrotopsis is a genus of North American plants in the tribe Bahieae within the family Asteraceae. Species Psathyrotopsis hintoniorum B.L.Turner - Coahuila Psathyrotopsis purpusii (Brandegee) Rydb. - Coahuila Psathyrotopsis scaposa (A.Gray) H.Rob. - Chihuahua, Texas, New Mexico

Platyschkuhria is a genus of North American flowering plants in the daisy family. It contains a single species, Platyschkuhria integrifolia, the basindaisy. It is native to the Colorado Plateau and Canyonlands region of Arizona, Colorado, New Mexico, Montana (Carbon County), Utah, and Wyoming in the western United States. It grows in clay soils in desert shrub, pinyon juniper woodland, and mountain brush communities.

Petrophytum caespitosum (orth. var. Petrophyton caespitosum) is a woody perennial species of flowering plant in the rose family known by the common name mat rock spiraea and native to western United States.

Oreomecon pygmaea is a species of poppy known by the common name alpine glacier poppy. It is native to North America, where it can be found in British Columbia, Alberta, and Montana. It has a narrow distribution around the intersection of the three borders. There are about 44 known occurrences, mostly in Montana, with about a third in Alberta and two in British Columbia. It is present in a number of locations within Glacier National Park. This perennial herb produces a stem up to 12 centimeters tall from a taproot. The blue-green leaves are up to 5 centimeters long. The flower is about 2