Franz Petrak

Austrian-czech botanist and mycologist (1886–1973).

Franz Petrak (9 October 1886 in Mährisch-Weißkirchen – 9 October 1973 in Vienna) was an Austrian-Czech mycologist. From 1906 to 1910, he studied botany at the University of Vienna, where he was a student of Richard Wettstein. In 1913, he obtained his doctorate of sciences, and until 1916, worked as a high school teacher in Vienna. During World War I, he was stationed in Galicia and Albania, where he collected specimens in his spare time. From 1918 to 1938, he worked as a private scientist in his home town, and from 1938 to 1951, was associated with the Naturhistorisches Museum in Vienna. He wa

Abbreviations: Petr.
Occupations: scientific collector, mycologist, botanist, botanical collector, biologist
Citizenships: Austria–Hungary, Austria
Languages: German
Dates: 1886-01-01T00:00:00Z – 1973-01-01T00:00:00Z
Birth place: Hranice
Direct attributions: 103 plants, 2,383 fungi
Authorship mentions: 134 plants, 2,587 fungi

103 plants attributed, 31 plants contributed to134 plants:

Cirsium perplexans (Rocky Mountain Thistle) Petr. 1917
plant species in the asteraceae family
Cirsium perplexans is a species of flowering plant in the family Asteraceae known by the common names Rocky Mountain thistle and Adobe Hills thistle. It is endemic to Colorado in the United States, where it occurs in the Colorado and Gunnison River Valleys in the Rocky Mountains. This species is a biennial herb growing up to one meter tall from a taproot. The stems are coated thinly in webby fibers. The leaves are up to 30 centimeters long by 6 wide. They are sometimes unlobed but have toothed margins. The leaves have woolly fibers, especially on the undersides. The flower heads contain long
Cirsium arizonicum (Arizona Thistle) (A.Gray) Petr. 1911
plant species in the asteraceae family
Cirsium arizonicum, the Arizona thistle, is a North American species of thistle in the family Asteraceae, native to the southwestern United States and northwestern Mexico. It has been found in Arizona, southeastern California, New Mexico, Nevada, Colorado, Utah, Sonora, and northwestern Chihuahua. Cirsium arizonicum is a herbaceous plant that can be either biennial or perennial, reaching 30–150 cm in height. The spiny leaves are oblong-obovate with pinate lobes; the basal leaves are larger, 10–40 cm long, while leaves on the upper stem can be only 3 cm long. The inflorescence is 3–4 cm in
Cirsium andersonii (Rose Thistle) Petr. 1911
perennial plant species in the asteraceae family
Cirsium andersonii is a North American species of thistle known by the common names Anderson's thistle and rose thistle. It is native to California, Oregon, and Nevada, where it grows in the woodlands and forest openings of the local high mountain ranges, including the Sierra Nevada and the southern Cascade Range. It has also been reported from Idaho. This native thistle is a perennial herb growing erect to a maximum height approaching 100 cm (39 in). It produces one to multiple stems, simple or branching, which may be hairless to quite woolly. The deeply lobed and sharply cut leaves are
Cirsium wheeleri (Wheeler's Thistle) Petr. 1911
plant species in the asteraceae family
Cirsium wheeleri is a North American species of plants in the tribe Cardueae within the family Asteraceae. Common names include Wheeler's thistle. It is native to northern Mexico (Chihuahua, Sonora) and the southwestern United States (Arizona, New Mexico, Colorado, Utah, Nevada). Cirsium wheeleri is a perennial herb up to 60 cm (2 feet) tall with a large taproots. Leaves have slender spines. There are one or more flower heads, each with white, pink, or pale purple disc florets but no ray florets. The plant grows in mountain meadows and open conifer forests.
Cirsium parryi (Parry's Thistle) Petr. 1911
plant species in the asteraceae family
Cirsium parryi, or Parry's thistle, is a species of North American flowering plants in the family Asteraceae. It is native to the southwestern United States, where it has been found in Colorado, Arizona, and New Mexico. Cirsium parryi is a biennial herb with a hairy stem growing up to 200 cm (80 inches) tall or more. The leaves are oblong or lance-shaped and measure 10 to 30 centimeters (4–12 inches) long. They are often toothed or divided partly into lobes. The lower ones have usually withered by flowering time. The inflorescence may contain many flower heads at the end of the stem and near
Cirsium osseticum (Ossetin Thistle) Petr. 1912
perennial plant species in the asteraceae family
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Cirsium mohavense (Mojave Thistle) (Greene) Petr. 1911
perennial plant species in the asteraceae family
Cirsium mohavense is a species of thistle known by the common names virgin thistle and Mojave thistle. It is native to the southwestern United States, where it grows in moist areas in otherwise dry habitat, such as desert springs. It is most common in the Mojave Desert, found also in the southern Great Basin and other nearby regions of California, Nevada, western Arizona, and southwestern Utah. Cirsium mohavense is a biennial or perennial growing up to 2.5 meters (100 inches or 8 feet 4 inches) tall. The densely woolly stem branches and spreads near the top. The leaves are toothed to deeply
Cirsium × glabrifolium Petr. 1911
plant hybrid species in the asteraceae family
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Cirsium clavatum (Fish Lake Thistle) (M.E.Jones) Petr. 1917
plant species in the asteraceae family
Cirsium clavatum, the Fish Lake thistle or fringed thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is native to the western United States, the States of Wyoming, Colorado, Utah, Arizona, and New Mexico. Cirsium clavatum is a biennial or perennial herb up to 100 cm (40 inches) tall, blooming only once before dying. Leaves have thin spines along the edge, much smaller than those of related species. There are several to many flower heads, with white or pale pink disc florets but no ray florets. Varieties Cirsium clavatum var.
Cirsium anartiolepis Petr. 1911
plant species in the asteraceae family
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Cirsium sychnosanthum Petr. 1914
plant species in the asteraceae family
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Cirsium shansiense Petr. 1943
perennial and medicinal plant species in the asteraceae family
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Cirsium rydbergii (Rydberg's Thistle) Petr. 1917
plant species in the asteraceae family
Cirsium rydbergii, the alcove thistle, or Rydberg's thistle, is North American species of perennial plants in the family Asteraceae, found in the Colorado Plateau and Canyonlands regions of the southwestern United States, in the States of Utah and Arizona. Cirsium rydbergii is a large perennial herb sometimes reaching a height of 300 cm (10 feet). It has no or very few branches, and pinnately lobed leaves up to 90 cm (3 feet) long with many sharp spines but usually very few hairs. flower heads are spiny on the sides, containing white, pink, or purple disc florets but no ray florets.
Cirsium handelii Petr. 1926
plant species in the asteraceae family
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Cirsium falconeri (Falconer's Thistle) Petr. 1912
perennial plant species in the asteraceae family
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Cirsium eriophoroides Petr. 1912
edible, perennial, and medicinal plant species in the asteraceae family
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Cirsium caucasicum Petr. 1912
perennial plant species in the asteraceae family
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Cirsium acantholepis Petr. 1910
plant species in the asteraceae family
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Wettsteinia Petr. 1910
plant genus in the adelanthaceae family
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Cirsium velatum (S.Watson) Petr. 1910
plant species in the asteraceae family
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Cirsium turkestanicum Petr. 1910
perennial plant species in the asteraceae family
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Cirsium tracyi (Tracy's Thistle) (Rydb.) Petr. 1917
plant species in the asteraceae family
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Cirsium tolucanum Petr. 1910
plant species in the asteraceae family
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Cirsium swaticum Petr. 1973
plant species in the asteraceae family
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Cirsium sommieri Petr. 1911
perennial plant species in the asteraceae family
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Cirsium sieversii (Fisch. & C.A.Mey.) Petr. 1846
plant species in the asteraceae family
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Cirsium rhaphilepis Petr. 1910
plant species in the asteraceae family
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Cirsium pringlei Petr. 1910
plant species in the asteraceae family
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Cirsium lomatolepis Petr. 1910
plant species in the asteraceae family
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Cirsium lidjiangense Petr. & Hand.-Mazz. 1936
edible, perennial, and medicinal plant species in the asteraceae family
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