Solidago ptarmicoides
Solidago plumosa
prairie goldenrod, upland white aster, verge-d'or faux-ptarmica, white flat-top goldenrod
plumed goldenrod, plumose goldenrod
1–20+, erect, slender, glabrous proximally, hispid distally.
glabrous, viscid-resinous.
basal and proximal cauline persistent, subpetiolate to sessile, blades sometimes 3-nerved, linear to linear-lanceolate, 60–100 × 7–10 mm, stiff, flat, margins entire or subentire, faces glabrous or sparsely hairy;
mid to distal cauline sessile, blades linear oblanceolate to linear, 20–40 × 3–5 mm, reduced distally, margins entire.
basal petiolate;
blades tapering to petioles, linear to elliptic-oblanceolate, 100–150 (–220) (including petiole) × 5–10(–15) mm, margins serrate, apices acute to obtuse; the outer much smaller;
mid and distal similar to basal, becoming sessile, mid 40–60 × 2–4 mm, distally reduced (in arrays) to linear bracts 10–35 × 1–2 mm, entire.
29–36.5 mm, strigillose;
bracteoles linear.
2–6 mm, glabrous, sometimes resinous-glandular;
bracteoles linear, 0–5.
5–6 mm.
campanulate, 4.5–6 mm.
10–20, usually white, rarely pale yellow (conspicuous);
laminae 7–7.3 × 1.4–1.6 mm.
3–6;
laminae 3.5–5 × 1 mm.
30–36;
corollas 3.8–4.1 mm, lobes 0.5–0.7 mm.
mostly 8–10;
corollas 4.5–5.5 mm, lobes 0.8–1.2 mm.
in 4–5 series, usually prominently 1-nerved, linear, strongly unequal, outer acute, inner acute to obtuse, glabrous.
(in 3–4 series) lanceolate to linear-lanceolate, strongly unequal, apices rounded, glabrous, somewhat resinous.
1–25(–50), in corymbiform arrays.
in paniculiform arrays, 15–30 cm, branches ascending, 2–10 cm, not secund in erect stems, secund in arching ones.
(obconic) 1–1.5 mm (ribbed), glabrous;
pappi 3.4–4 mm (apically clavate).
obconic, ca. 2.5 mm, shallowly ribbed, glabrous;
pappi 4–5 mm.
= 18.
= 18.
Solidago ptarmicoides
Solidago plumosa
L. Brouillet and J. C. Semple (1981) summarized the morphologic, chemical, cytological, and hybridization data on Solidago ptarmicoides and concluded that, except for the white rays, it is a typical member of sect. Ptarmicoidei. The species hybridizes with S. rigida, S. ohioensis, S. riddellii, and perhaps other goldenrods. It is not known to hybridize with any species of aster (regardless of genus); the supposed Aster × Solidago hybrids are the basis of all reports of intergeneric hybrids in the literature. Horticultural hybrids involving S. ptarmicoides and other Solidago species have been treated as S. ×luteus (M. L. Green ex Dress) Brouillet & Semple (×Solidaster luteus M. L. Green ex Dress). Solidago ×bernardii B. Boivin [Oligoneuron ×bernardii (B. Boivin) G. L. Nesom] is the formal name applied to S. ptarmicoides × S. riddellii hybrids; those have cream rays. Solidago ×lutescens (Lindley ex de Candolle) B. Boivin [Diplopappus lutescens Lindley ex de Candolle; D. albus var. lutescens (Lindley ex de Candolle) Hooker ex Torrey & A. Gray; Aster lutescens (Lindley ex de Candolle) Hooker ex Torrey & A. Gray; A. ptarmicoides var. lutescens (Lindley ex de Candolle) A. Gray; Oligoneuron ×lutescens (Lindley ex de Candolle) G. L. Nesom] applies to hybrids between S. ptarmicoides and S. rigida or S. riddellii from the prairies; these also have cream colored rays.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Solidago plumosa is known only from a short stretch of the Falls Yadkin River, Stanley County. This species is similar to S. simplex var. racemosa and possibly conspecific with S. simplex. Insufficient material of this taxon has limited study. Known only from the type material since its description, it has been found recently, locally abundant along the Yadkin River at the type locality (A. Weakly, pers. comm.).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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