Per Axel Rydberg (July 6, 1860 – July 25, 1931) was a Swedish-born, American botanist who was the first curator of the New York Botanical Garden Herbarium...

journalist and politician Per Axel Rydberg (1860–1931), Swedish-American botanist Sam Rydberg (1885–1956), Swedish composer Viktor Rydberg (1828–1895), Swedish...

and Epeteiorhiza for annual species. Michel Félix Dunal in 1852 and Per Axel Rydberg in 1896 also published efforts to subdivide Physalis, although these...

south central United States and Mexico. The genus was established by Per Axel Rydberg in 1907. As of March 2024[update], Plants of the World Online accepted...

species was first named Perityle incana by Asa Gray in 1876. In 1914 Per Axel Rydberg placed it in the monotypic genus Nesothamnus as Nesothamnus incanus...

species of grass in the family Poaceae. It was first described in 1909 by Per Axel Rydberg. "Festuca calligera (Piper) Rydb". Retrieved 2023-01-12. v t e...

Symphyotrichum molle (formerly Aster mollis) is a species of flowering plant in the aster family (Asteraceae) endemic to the Bighorn Mountains of Montana...

not George Don, the elder (Don)), Asa Gray, James Francis Macbride, Per Axel Rydberg, Louis Otho Williams, and Mikhail Grigorevich Popov. Asa Gray divided...

and the Yukon. Festuca minutiflora was first published in 1905 by Per Axel Rydberg. It is perennial and mainly grows in temperate biomes. "Festuca minutiflora...

Flora of North America, Ericameria obovata (Rydberg) G. L. Nesom, Phytologia. 68: 152. 1990. Rydberg, Per Axel 1900. Bulletin of the Torrey Botanical Club...

(1858–1954) Nathaniel Lord Britton (1859–1934) Aven Nelson (1859–1952) Per Axel Rydberg (1860–1931) Alfred Rehder (1863–1949) Albert Spear Hitchcock (1865–1935)...

Zigadenus venenosus, and described by Sereno Watson in 1879. The botanist Per Axel Rydberg proposed the new genus Toxicoscordion in 1903 and placed the species...

Swedish-American botanist Per Axel Rydberg, 1860–1931. The Plant List Arnica rydbergii Greene Flora of North America, Rydberg’s arnica, Arnica rydbergii...

Rating of 2 out of 5, with no medicinal value or other uses noted. Per Axel Rydberg. 1896. The North American species of Physalis and related genera. Memoirs...

Ware Riddle Louis Claude Richard Ludwig Reichenbach Oliver Rackham Per Axel Rydberg Peter H. Raven Thekla Resvoll Tony Rodd Werner Rothmaler William Roxburgh...

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. Tweedy's...

clear-cut taxonomic segregation seems possible." In 1900, the botanist Per Axel Rydberg placed Pedicularis groenlandica in a new genus with the name Elephantella...

Eastwood in 1896. At that time she named it Psoralea juncea. In 1919 Per Axel Rydberg reclassified it with the name Psoralidium junceum. It was given its...

the long waves in the westerlies that were later named Rossby waves Per Axel Rydberg, Swedish-born, American botanist who was the first curator of the New...

earliest name given to the plaint was Crossostephium insulare, coined by Per Axel Rydberg in 1916. In 1935, Philip Alexander Munz declared this to be a variety...

proper classification has continued to be debated by botanists with Per Axel Rydberg proposing to move it to his new genus as Sabina scopulorum in 1900...

and published in 1905 by Per Axel Rydberg, who named it in honor of Frank Tweedy, one of the earliest collectors. Rydberg's type description is based...

Sigfrid Lindberg - Axel Alfredsson, Gunnar Zacharoff - Erik Persson, Gunnar Holmberg, Verner Andersson - Rune Wenzel, Gunnar Rydberg, Filip Johansson,...

and botanical Latin secund 'one-sided' and florus 'flower'. In 1906 Per Axel Rydberg described a new species, Penstemon unilateralis, in the Bulletin of...

1906 book. Arguing against Erythrocoma, the Swedish-American botanist Per Axel Rydberg classified it as Sieversia canescens in 1913. In 1958, American botanist...

it to the genus Dichelostemma as Dichelostemma capitatum. In 1912, Per Axel Rydberg moved it to Dipterostemon as Dipterostemon capitatus. Most sources...

was scientifically described as a species in 1905 by the botanist Per Axel Rydberg, though using the then current spelling of Pentstemon with an extra...

subspecies. The variety montanense was first described as a species by Per Axel Rydberg in 1900 using the name Trifolium montanense. It was described as a...

labeled it and many other species as D. azureum. In 1912 the botanist Per Axel Rydberg described a specimen collected in Wyoming as a separate species named...

named the New World herb genus Allionia (Nyctaginaceae) after Allioni. Per Axel Rydberg named the genus Allioniella (now a taxonomic synonym for Mirabilis)...