Erigeron radicatus
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''Erigeron radicatus'' is a North American species of flowering plant in the family Asteraceae known by the common names Hooker's fleabane and taproot fleabane The species grows in central Canada ( Alberta, Saskatchewan) and parts of the north-central United States, primarily the northern Rocky Mountains and the Black Hills. It has been found in Idaho, Montana, Utah, Wyoming, Colorado, Nebraska, and South Dakota, with a few isolated populations reported from North Dakota. ''Erigeron radicatus'' is a small perennial herb up to 12 centimeters (4.8 inches) tall, producing a woody branching
caudex A caudex (plural: caudices) of a plant is a stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.pages 456 and 695 In the strict sense of the term, meaning a stem, "caudex" is m ...
. The plant generally produces only 1 flower head per stem. Each head has 12–85 purple or white ray florets surrounding numerous yellow disc florets. The species grows on rocky slopes, ledges, ridges, and cliff faces at high elevations.Flora of North America, ''Erigeron radicatus'' Hooker, 1834. Hooker’s fleabane
/ref>Hooker, William Jackson 1834. Flora Boreali-Americana 2(7): plate CXXII (122)
full-page line drawing of ''Erigeron radicatus''


References

radicatus Flora of Western Canada Flora of the North-Central United States Flora of the Northwestern United States Flora of the Great Plains (North America) Flora of the Rocky Mountains Plants described in 1834 Taxa named by William Jackson Hooker Flora without expected TNC conservation status {{Erigeron-stub