Robert Theodore Clausen

Botanist (1911-1981).

Abbreviations: R.T.Clausen
Occupations: botanist
Citizenships: United States
Dates: 1911-12-26T00:00:00Z – 1981-12-31T00:00:00Z
Direct attributions: 67 plants, 0 fungi
Authorship mentions: 74 plants, 0 fungi

67 plants attributed, 7 plants contributed to74 plants:

Sedum rubrotinctum (Pork And Beans) R.T.Clausen 1948
plant species in the crassulaceae family
Sedum rubrotinctum or Sedum × rubrotinctum, commonly known as jelly-beans, jelly bean plant, or pork and beans, is a species of Sedum from the plant family Crassulaceae. It is a succulent plant originating in Mexico. The common English name refers to its short leaves that resemble jelly beans, especially when taking on a protective hue.
Sedum glaucophyllum (Cliff Stonecrop) R.T.Clausen 1946
plant species in the crassulaceae family
Sedum glaucophyllum, the cliff stonecrop, is a species of Sedum native to the Appalachian Mountains in the eastern United States from West Virginia, Maryland, Virginia and North Carolina. Sedum glaucophyllum is a prostrate, mat-forming evergreen perennial plant forming patches up to 30–40 cm (12–15.5 in) in diameter. The leaves are glaucous green, succulent, rounded, 1–2 cm (0.5–1 in) long and wide, arranged in a dense helix on the stems. The flowers are white, 10–12 mm (0.39–0.47 in) in diameter, with four slender, pointed petals; they are produced in clusters on erect stems up to 10 cm (4
Sedum clavatum R.T.Clausen 1975
plant species in the crassulaceae family
Sedum clavatum is a succulent plant that grows in compact rosettes that elongate into long stems with time. Originally identified growing in southern Mexico, S. clavatum produces white, star-shaped flowers in mid to late spring to early summer. They are often grown as decorative plants in rock gardens. Like almost all succulents, S. clavatum needs to be protected from frost and is hardy to 32 °F (0 °C). It grows 4 to 6 inches tall at mature height and 8 inches wide. S. clavatum is an annual that needs average watering and is categorized as fairly easy to maintain. It flourishes in semi-arid
Sedum lucidum R.T.Clausen 1951
plant species in the crassulaceae family
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Sedum hintonii R.T.Clausen 1943
plant species in the crassulaceae family
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Sedum craigii R.T.Clausen 1943
plant species in the crassulaceae family
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Sedum caducum R.T.Clausen 1950
plant species in the crassulaceae family
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Sedum torulosum R.T.Clausen 1946
plant species in the crassulaceae family
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Sedum oblanceolatum (Applegate Stonecrop) R.T.Clausen 1975
plant species in the crassulaceae family
Sedum oblanceolatum is a species of flowering plant in the family Crassulaceae known by the common names oblongleaf stonecrop and Applegate stonecrop. It is native to the Klamath Mountains of southwestern Oregon and far northern California, where it grows on many types of rocky substrate, such as serpentine soils and other ultramafics. It is a succulent plant forming basal rosettes of waxy leaves. The leaves are mainly lance-shaped, widest near the distal end and narrowing to rounded or notched tips. Smaller leaves occur higher up the stem. The small inflorescence grows a few centimeters tall
Sedum obcordatum R.T.Clausen 1941
plant species in the crassulaceae family
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Sedum moranii (Rogue River Stonecrop) R.T.Clausen 1942
perennial plant species in the crassulaceae family
Sedum moraniii is a rare species of flowering plant in the family Crassulaceae known by the common name Rogue River stonecrop. It is endemic to Oregon in the United States, where it only grows in Josephine County next to the Rogue River. This is a perennial herb with a glandular rootstock producing rosettes of leaves and flowering shoots. The fleshy leaves are green in color and the young ones are waxy in texture. Mature stems and leaves may be reddish or purple. Leaves toward the ends of the stems may be hairy. They are up to 3.2 centimeters long by 1.4 wide. The flowering stem is up to 30
Sedum chloropetalum R.T.Clausen 1948
plant species in the crassulaceae family
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Sedum albomarginatum (Feather River Stonecrop) R.T.Clausen 1975
perennial plant species in the crassulaceae family
Sedum albomarginatum is a rare species of flowering plant in the family Crassulaceae known by the common name Feather River stonecrop. It is endemic to California where it is known from fewer than 20 occurrences along the Feather River in Plumas and Butte Counties. It grows on steep cliffs and mountain slopes in rocky serpentine substrates.
Pachyrhizus panamensis R.T.Clausen 1945
plant species in the fabaceae family
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Villadia misera (Lindl.) R.T.Clausen 1959
plant species in the crassulaceae family
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Sedum trichromum R.T.Clausen 1978
plant species in the crassulaceae family
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Sedum spathulisepalum R.T.Clausen 1977
plant species in the crassulaceae family
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Sedum reptans R.T.Clausen 1978
plant species in the crassulaceae family
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Sedum quadripetalum R.T.Clausen 1977
plant species in the crassulaceae family
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Sedum pulvinatum R.T.Clausen 1948
plant species in the crassulaceae family
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Sedum pentastamineum R.T.Clausen 1959
plant species in the crassulaceae family
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Sedum latifilamentum R.T.Clausen 1979
plant species in the crassulaceae family
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Sedum globuliflorum R.T.Clausen 1979
plant species in the crassulaceae family
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Sedum cormiferum R.T.Clausen 1959
plant species in the crassulaceae family
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Ophioglossum thomasii R.T.Clausen 1938
plant species in the ophioglossaceae family
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Ophioglossum scariosum R.T.Clausen 1938
plant species in the ophioglossaceae family
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Dalea scandens (Low Prairie Clover) (Houst. ex Mill.) R.T.Clausen 1946
plant species in the fabaceae family
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Sedum × luteoviride R.T.Clausen 1946
plant hybrid species in the crassulaceae family
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Sedum cremnophila R.T.Clausen 1943
plant species in the crassulaceae family
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Alnus incana ssp. rugosa (Speckled Alder) (Du Roi) R.T.Clausen 1949
plant subspecies in the betulaceae family
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