Solidago leavenworthii
Solidago plumosa
Leavenworth's goldenrod
plumed goldenrod, plumose goldenrod
1–10+, erect, scabroso-puberulent proximal to arrays distally, in strips proximal to leaves.
glabrous, viscid-resinous.
basal 0;
mid and distal cauline sometimes numerous (75+), somewhat crowded, sessile, blades (dark green) linear-lanceolate to lanceolate, 25–150 × 2–15 mm, margins serrate to entire, scabroso-ciliate, 3-nerved, faces glabrous or with short hairs in lines along nerves.
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.
1–5 mm, sparsely to moderately strigillose;
bracteoles 1–3, linear-lanceolate.
2–6 mm, glabrous, sometimes resinous-glandular;
bracteoles linear, 0–5.
narrowly campanulate, 3–5 mm.
campanulate, 4.5–6 mm.
10–15;
laminae 2–3 × 0.1–0.6 mm.
3–6;
laminae 3.5–5 × 1 mm.
6–10;
corollas 3–4 mm, lobes 0.6–1.1 mm.
mostly 8–10;
corollas 4.5–5.5 mm, lobes 0.8–1.2 mm.
in 3–4 series, strongly unequal (greenish), outer lanceolate, inner oblong-lanceolate, margins ciliate-fimbriate apically, midnerves swollen apically, apices obtuse to rounded, glabrous.
(in 3–4 series) lanceolate to linear-lanceolate, strongly unequal, apices rounded, glabrous, somewhat resinous.
50–350, in secund, usually elongate, pyramidal paniculiform arrays, branches recurved and secund.
in paniculiform arrays, 15–30 cm, branches ascending, 2–10 cm, not secund in erect stems, secund in arching ones.
(narrowly obconic) 1.1–1.5 mm (ribbed), sparsely strigillose;
pappi 2.5–3 mm.
obconic, ca. 2.5 mm, shallowly ribbed, glabrous;
pappi 4–5 mm.
= 18, 36, 54.
= 18.
Solidago leavenworthii
Solidago plumosa
Solidago leavenworthii replaces S. gigantea on the southern, outer Atlantic coastal plain and into Florida. The leaves of S. leavenworthii usually have fewer, smaller serrations than those of S. gigantea, and they have a distinctive dark, somewhat olive green color. The pyramidal array of S. leavenworthii is usually much narrower and elongate while that of S. gigantea is usually broad and not elongate.
(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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