Solidago leavenworthii
Solidago delicatula
Leavenworth's goldenrod
smooth elm-leaf goldenrod
1–10+, erect, scabroso-puberulent proximal to arrays distally, in strips proximal to leaves.
1–10+, essentially glabrous.
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 and proximal cauline tapering to short petioles, blades oblanceolate, 50–70 × 10–20 mm, margins serrate, scabroso-strigose, apices acute to acuminate, faces glabrous;
mid and distal cauline subpetiolate or sessile, blades elliptic-lanceolate, 30–70 × 7–15 mm, gradually reduced distally, tapering to bases, margins serrate, scabroso-strigose;
branch leaves similar, reduced to bracts distally.
1–5 mm, sparsely to moderately strigillose;
bracteoles 1–3, linear-lanceolate.
2–5 mm, bracteolate, glabrous;
bracteoles grading into phyllaries.
narrowly campanulate, 3–5 mm.
narrowly campanulate, 3–5 mm.
10–15;
laminae 2–3 × 0.1–0.6 mm.
1–4;
laminae 1–2 × 0.5–0.8 mm.
6–10;
corollas 3–4 mm, lobes 0.6–1.1 mm.
4–6;
corollas 2.5 mm, lobes 1 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, linear-lanceolate, strongly unequal, acute to ± attenuate, glabrous.
50–350, in secund, usually elongate, pyramidal paniculiform arrays, branches recurved and secund.
160–480 in paniculiform arrays, with a strongly secund, primary, arching axis and nearly always 4–5(–8) leafy, elongate, arching, secund, proximal branches.
(narrowly obconic) 1.1–1.5 mm (ribbed), sparsely strigillose;
pappi 2.5–3 mm.
1.5–2 mm (6–9 ribs), sparsely strigose, more so apically;
pappi 1.5–2 mm.
= 18, 36, 54.
= 18.
Solidago leavenworthii
Solidago delicatula
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.)
Solidago delicatula is similar to S. ulmifolia, but is essentially glabrous (except for leaf margins) with smaller, more numerous, less conspicuously veiny leaves. It is sufficiently distinct from S. ulmifolia that inclusion in that species as var. microphylla does not appear warranted. Reports from Alabama, western Florida, Louisiana, and Mississippi are likely just smaller-leaved S. ulmifolia. Solidago helleri Small may be a hybrid between S. delicatula and S. ulmifolia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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