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Published In: A Synopsis of the Flora of the Western States 57. 1835. (Syn. Fl. West. States) Name publication detail
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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19. Solidago riddellii Frank ex Riddell

Oligoneuron riddellii (Frank ex Riddell) Rydb.

Pl. 237 e, f; Map 1008

Plants with the rootstock short and branched, sometimes producing short-creeping, stout rhizomes. Stems 1 to several, 40–100 cm long, erect or ascending, with several fine, longitudinal ridges or grooves, glabrous below the inflorescence (where scattered, inconspicuous, short hairs sometimes occur), somewhat shiny. Leaves basally disposed, often withered at flowering (additional rosettes usually present adjacent to the flowering stem), the papery remains often persistent. Basal and lowermost stem leaves with the blade 8–25 cm long, 0.8–1.5 cm wide, more than 10 times as long as wide, narrowly oblanceolate to linear, relatively stiff and folded longitudinally along the midvein, long-tapered to a more or less long-petiolate, winged base, angled or tapered to a sharply pointed tip, the margins entire but minutely roughened, the surfaces glabrous, the undersurface usually with 3–7 faint to conspicuous main veins. Median and upper stem leaves 2–8(–12) cm long, linear (the uppermost often narrowly lanceolate), sessile or with a short, poorly differentiated petiole, otherwise similar to the lower stem leaves. Inflorescences terminal panicles (or sometimes appearing as a dense terminal cluster), appearing flat-topped or shallowly rounded in overall outline, the heads solitary or in small clusters at the branch tips. Involucre 4.5–6.0 mm long, the bracts in 3–5 unequal series. Involucral bracts linear to narrowly oblong, rounded to broadly and bluntly pointed at the appressed-ascending tip, the pale margins slightly irregular and/or finely hairy (but sometimes curled under), the outer surface glabrous, pale yellow to straw-colored toward the base, with an oblong to elliptic or somewhat diamond-shaped green area toward the tip, the midvein usually thickened or keeled, the 1 or 2 pairs of additional veins often faint. Receptacle naked. Ray florets 7–9, the corollas 5–6 mm long, yellow. Disc florets 6–10, the corollas 4.5–5.5 mm long, the lobes 0.7–1.5 mm long, yellow. Pappus 3.5–4.5 mm long, most of the bristles slightly thickened toward the tip. Fruits 1.5–2.2 mm long, narrowly obovoid, glabrous or with a few hairs along the ribs. 2n=18. August–October.

Scattered to uncommon in the Ozark and Ozark Border Divisions (North Dakota to Arkansas east to Michigan and Ohio; apparently disjunct in Georgia). Fens and calcareous seeps along streams.

This attractive species is an indicator of high-quality calcareous seepage wetlands, especially fens.

 


 

 
 
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