Solidago brachyphylla |
Solidago |
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Dixie goldenrod |
goldenrod |
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Habit | Plants 50–120 cm; rhizomes short, caudexlike. | Perennials, 5–100(–200) cm; woody caudices or rhizomes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Stems | 1–5, sparsely to moderately strigoso-puberulent. |
decumbent to ascending or erect, sometimes branched distally, glabrous or strigose, strigillose, hispid, or short-villous. |
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Leaves | basal petioles 3–5 cm, blades oblanceolate or spatulate to ovate or rotund, 2–4 cm (excluding petioles); cauline (numerous) subsessile or sessile, blades elliptic or lance-elliptic to ovate, mid mostly 25–50(–65) × 10–25 mm, distal much reduced; branch leaf petioles 1 mm, blades ovate, 5–15 (excluding petioles) × 2–10 mm. |
basal (persistent or not by flowering) and cauline; petiolate (proximal) or sessile (proximal and distal, latter sometimes subpetiolate); proximal blades sometimes 3-nerved, ovate-oblanceolate, margins often serrate, faces glabrous or densely hairy; distal sometimes 3-nerved, glabrous or sparsely to densely scabrous, strigillose, or villous, sometimes stipitate-glandular, sometimes resinous. |
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Peduncles | linear, 1–3 mm, bracteate. |
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Involucres | narrowly campanulate, 3–5 mm. |
campanulate to cylindric (often spreading upon drying), 3–12 × 1.7–10 mm. |
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Receptacles | slightly convex, pitted, epaleate. |
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Ray florets | 0(–2). |
(0–)2–15(–24), pistillate, fertile; corollas yellow, rarely white (usually glabrous). |
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Disc florets | 4–8; corollas 3 mm, lobes 1 mm. |
2–35(–60), bisexual, fertile; corollas yellow, ± ampliate, tubes shorter than throats (usually glabrous), lobes 5, erect to spreading, triangular to narrowly lanceolate; style-branch appendages broadly to narrowly triangular (lengths 0.7–1 times stigmatic lines). |
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Phyllaries | in 3–4 series, lanceolate, strongly unequal, margins ciliate, apices acute, glabrous. |
10–35 in 3–5 series, midnerves usually ± swollen and translucent, sometimes plus 2–5 secondary nerves (striate, flat), linear-lanceolate to oblong or ovate, unequal to rarely subequal, margins scarious, (apices rounded to acute or attenuate), faces glabrous or sparsely pilose or puberulent, sometimes minutely stipitate-glandular, sometimes resinous. |
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Heads | 75–200 in open paniculiform arrays, branches divaricate, ascending to recurved, weakly to strongly secund, to 50 cm, secondary branches less than 3 cm. |
usually radiate, sometimes discoid, (1–)2–1500+ in racemiform (club-shaped or pyramidal), paniculiform or corymbo-paniculiform, sometimes secund arrays. |
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Cypselae | 2.5–3 mm, moderately short-strigose; pappi 2 mm. |
narrowly obconic to cylindric, sometimes somewhat compressed, ribs usually 8–10 (either darker and sometimes translucent or lighter than bodies), glabrous or moderately strigillose; pappi persistent, outer setiform scales (0.25–0.5 mm; rarely present) plus 2 series of 25–45 longer, barbellate bristles, mid apically attenuate, 90–95% length of inner, inner apically weakly to strongly clavate [(0.5–in S. sphacelata)1.5–5(–7.3) mm]. |
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x | = 9. |
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2n | = 18. |
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Solidago brachyphylla |
Solidago |
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Phenology | Flowering (Sep–)Oct(–Nov). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Habitat | Open woods, coastal plain, and piedmont | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Elevation | 10–100+ m (0–300+ ft) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Distribution |
AL; FL; GA; NC; SC
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North America; Mexico; South America; Eurasia |
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Discussion | Solidago brachyphylla possibly occurs also in Mississippi. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species ca. 100 (77 in the flora). Solidago is found primarily in North America with some South American and Eurasian species (8 in Mexico, 4 in South America, 6–10 in Europe and Asia). Recent studies on the phylogeny of Astereae and Solidago have done much to resolve relationships of the goldenrods to each other and to other genera within the tribe (J. J. Zhang 1996; J. C. Semple et al. 1999; R. D. Noyes and L. H. Rieseberg 1999; J. B. Beck et al. 2004). Traditionally the grass-leaved goldenrods, Euthamia, have been included in Solidago; they are well separated within the North American clade. L. C. Anderson and J. B. Creech (1975) presented anatomic reasons for separating the two genera and also Chrysoma, Gundlachia, and Petradoria. The segregate genera Oligoneuron and Brachychaeta fit within Solidago based on anatomy and DNA studies. Brintonia lies outside Solidago based on DNA and morphology. The position of the monophyletic Oreochrysum also appears to lie outside and phylogenetically close to Solidago. G. L. Nesom (1993) placed the flat-topped goldenrods in Oligoneuron. Results from Zhang’s study indicate that the flat-topped goldenrods are nested within other goldenrod groups that Nesom included in Solidago. Beck et al. (2004) indicated that further work is needed before a definitive molecular-based phylogeny is available. While the flat-topped goldenrods are readily distinct from other goldenrods on the basis of arrangements of heads, additional features such as double pappus with clavate inner bristles and oligoneurate phyllaries occur in other species of Solidago as well. The flat-topped goldenrods are treated here as Solidago sect. Ptarmicoidei following Semple and K. N. Gandhi (2004). Nesom provided much of the formal subgeneric nomenclature that by and large is followed here; there are some differences in assignment of species to subsections. Semple (2003, 2004) proposed a number of additional new names and combinations used here. J. L. A. Hood and Semple (2003) presented evidence that the pappus of Solidago is not simple, as previously assumed, but is like that of related genera: it is in two series, inner series somewhat clavate and slightly longer, or sometimes in three series with an additional, shorter outer series of few setiform scales. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 133. | FNA vol. 20, p. 107. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Asteraceae > tribe Astereae > Solidago > sect. Solidago > subsect. Argutae > ser. Argutae | Asteraceae > tribe Astereae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Synonyms | S. boottii var. brachyphylla, S. pallescens | Actipsis, Aster subg. S., Leioligo, Oligoneuron | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Name authority | Chapman ex Torrey & A. Gray: Fl. N. Amer. 2: 218. (1842) | Linnaeus: Sp. Pl. 2: 878. (1753): Gen. Pl. ed. 5, 374. (1754) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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