Solidago speciosa
Solidago bicolor
noble goldenrod, showy goldenrod
silverrod, verge d'or bicolore, white goldenrod
1(–5), erect, glabrous proximally to strigillose in arrays.
1(–5), erect, usually branching only in array, moderately to densely hispido-villous.
basal and proximal cauline (sometimes withering by flowering) tapering to winged petioles, blades lanceolate to ovate-elliptic, 50–300 (including petiole) × 12–80 mm (sometimes firm), margins sharply serrate to crenate or entire, faces glabrate to sparsely strigillose;
mid to distal cauline sessile, blades narrowly ovate to lanceolate or elliptic, 25–90 × 5–30 mm, gradually reduced distally, margins serrulate to entire (distally), ciliate, faces glabrous or sparsely scabroso-strigose.
basal and proximal cauline tapering to winged petioles, blades oblanceolate to ovate, 35–210 × 15–50 mm, margins serrate or crenate, apices acute, sparsely to moderately soft hispido-villous, more densely so on abaxial nerves;
rosettes on rhizome branches sometimes present at flowering;
mid and distal cauline sessile, blades elliptic, 15–50 × 5–15 mm, distally reduced, margins entire.
1.5–3 mm, sparsely to moderately scabroso-strigillose;
bracteoles linear, grading into phyllaries, scattered along peduncles, clustered near heads.
1.5–2.5 mm, hispido-villous to canescent.
narrowly campanulate, 4–6.5 mm.
campanulate, 3–5 mm.
(2–)3–7(–9);
laminae 3–4 × 0.5–1 mm.
7–9 (white);
laminae 3.5–4 × 1–1.5 mm.
6–16;
corollas 2.5–4 mm, lobes 0.5–1.2 mm.
9–12;
corollas 3–4 mm, lobes 0.6–1.2 mm.
in 3–4 series, appressed, strongly unequal, outer ovate, mid and inner lanceolate, (midnerves often raised and thick) apices acute to obtuse or rounded, glabrous.
in 3–4 series, appressed, strongly unequal, oblong, margins white, scarious, apices obtuse to rounded.
15–300+, not secund, in usually dense, sometimes open, elongate, paniculiform to thyrsiform arrays, (5–)10–45 × (2–)3–7(–12) cm;
branches strongly ascending, often racemiform.
12–270 (1–15 per branch) in usually wand-shaped paniculiform arrays, of short axillary and terminal racemiform, non-secund clusters, sometimes proximal branches elongated, ascending and bearing short axillary and terminal racemiform clusters.
(narrowly obconic) 1.6–2.5 mm, glabrous;
pappi 3–4.5 mm.
(narrowly obconic) 1.5–2.5 mm, smooth or with 5–8 narrow, darker, sunken striations, glabrous or sparsely strigose;
pappi 2.5–3.5 mm (sometimes strongly clavate).
=18.
Solidago speciosa
Solidago bicolor
Subspecies 2 (2 in the flora).
Solidago speciosa occurs scattered throughout its range, often in small populations. Five races have been acknowledged; only three varieties appear to warrant recognition. The species is divided into two nearly allopatric subspecies. The typical subspecies includes two varieties that are sometimes difficult to distinguish and considerably overlap in their ranges. The differences in size and number of leaves and persistence of the proximal cauline leaves may be caused in part by growing conditions.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaves pale green, somewhat glaucous; plants 30–80 cm; e Colorado, extreme w Oklahoma, and adjacent New Mexico, disjunct in Black Hills (S. speciosa subsp. pallida) | var. pallida |
1. Leaves usually dark green, not glaucous; plants usually 80–200 cm; e deciduous forest onto e prairies and oak savannas (S. speciosa subsp. speciosa) | → 2 |
2. Basal leaves usually present at flowering, (20–) 28–55 mm wide, often coarsely serrate; mid cauline leaves (10–)20–28 mm wide, not crowded, not stiff, not scabrous; e UnitedStates | var. speciosa |
2. Basal leaves persisting or not to flowering, 8–20 mm wide, often entire or shallowly serrate; mid cauline leaves 4–15(–20) mm wide, often crowded, usually stiff, often somewhat scabrous; w portions of deciduous forest and adjacent prairies, glade habitats further east | var. rigidiuscula |
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