Solidago riddellii (Riddell's Goldenrod)
|Also known as:|
|Habitat:||sun; wet meadows, fens|
|Bloom season:||August - September|
|Plant height:||24 to 40 inches|
|Wetland Indicator Status:||GP: OBL MW: OBL NCNE: OBL|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Flower clusters are mostly rounded and flat topped, dense to semi-open, occasionally more an open panicle than flat. The yellow flowers have 7 to 9 rays (petals), are about ¼ inch or more tall, on multiple stalked clusters at the tip of the main stem. The floral bracts are rounded and relatively broad.
Leaves and stems:
Leaves are leathery with smooth surfaces, the edges toothless but rough (scabrous). Basal leaves are lance-like, often broadly oblong, tapering to a long winged stalk, up to 9 inches total length, usually withered away before flowering (deciduous). Stem leaves are 2 to 2¾ inches long, up to ½ inch wide, more lance linear, smooth surfaced, stalkless to clasping to sheathing, arched with a fold along the midrib and prominent lateral nerves, gradually becoming smaller up the stem. A plant may have multiple stems in a clump; stems are unbranched and mostly erect, mostly hairless except sometimes near the flower cluster.
Riddell's Goldenrod distribution in Minnesota is in moist prarie meadow habitats from south central up into the upper Red River Valley. The rounded flat cluster is unique from all other native goldenrods except Stiff Goldenrod (Solidago rigida) that is also present in its range. But S. rigida prefers dry sandy habitats and its stems leaves are decidedly rounder with rough, hairy surfaces. The folded, arching and often sheathing stem leaves uniquely separate Riddell's Goldenrod from the rest.
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Photos by K. Chayka and Peter M. Dziuk taken in McLeod County.
Have you seen this plant in Minnesota, or have any other comments about it?