''Solidago riddellii'', known as Riddell's goldenrod, is a North American plant species in the genus ''
Solidago'' of the family
Asteraceae. It grows primarily in the
Great Lakes and eastern
Great Plains
The Great Plains (french: Grandes Plaines), sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located west of the Mississippi River and east of the Rocky Mountains, much of it covered in prairie, steppe, an ...
of Canada and the United States. It is sometimes considered part of the genus ''Oligoneuron'', but as a ''Solidago'', included in the
section ''Solidago'' sect. ''Ptarmicoidei'', the flat-topped goldenrods.
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]
Description
''Solidago riddellii'' is a perennial herb up to 100 cm (40 inches) tall, with a branching underground 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 ...
. One plant system can produce as many as ten stems. The leaves are long and narrow, up to 25 cm (10 inches) long, produced along the stems as well as at the base. One stem can sometimes produce as many as 450 small yellow flower heads
A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...
, each with 7–9 ray florets surrounding 6–10 disc florets.
Distribution and habitat
Riddell's goldenrod is known from Alberta and Ontario, Canada. The core of its range in the United States is in prairie regions of Minnesota, Iowa, southern Wisconsin, northern Illinois and Indiana, southern Michigan, and Ohio. There are reports of isolated populations in Georgia, Arkansas, and southwestern South Dakota.[
It grows in wet prairies and marshy areas.][
]
References
External links
Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1990
{{Taxonbar, from=Q15568286
riddellii
Plants described in 1835
Flora of Canada
Flora of the Northeastern United States
Flora of the North-Central United States
Flora without expected TNC conservation status