Senna corymbosa
Senna artemisioides
Argentine senna, Argentine wild sensitive plant
silver senna
mesophyllous, 5.5–9.5 cm, glabrous or glabrate;
stipules caducous;
extrafloral nectary 1, between first leaflet pair, sessile or short-stipitate;
leaflet pairs 3, blades oblong-lanceolate, 25–60 × 5–14 mm.
slightly to highly xerophytic as phyllodes, 0.8–5 cm, finely hairy;
stipules caducous;
extrafloral nectaries 1–8, between first leaflet pair, sometimes also 1 or all subsequent pairs, sessile;
leaflet pairs 0–8, blades linear to narrowly elliptic, 20–70 × 1–8 mm.
4–18-flowered;
bracts caducous.
2–10-flowered;
bracts early caducous.
13–23 mm.
4–15 mm.
monosymmetric;
calyx brownish to greenish yellow;
corolla golden yellow, longest petal 8–16 mm;
androecium heterantherous, stamens 7, middle stamens 1/2 as long as abaxial or smaller, staminodes 3;
anthers of middle stamens to 3.6–4.8 mm, of abaxial stamens 5.2–6.5 mm, dehiscing by nearly U-shaped pore, apical appendage inconspicuous;
gynoecium incurved, ovules 34–50;
ovary hairy;
style slightly incurved.
slightly asymmetric, enantiostylous;
calyx yellowish to greenish;
corolla yellow, longest petal 6–10 mm;
androecium not heterantherous, stamens 10, staminodes 0;
anthers 1.5–5 mm, dehiscing by 2 pores, apical appendage 0;
gynoecium incurved, ovules unknown;
ovary slightly hairy;
style slightly incurved.
somewhat pendulous, cylindrical, straight, 40–120 × 6–10 mm, corrugated over seeds, indehiscent.
pendulous, flat, straight or slightly curved, 20–80 × 6–12 mm, corrugated over seeds, indehiscent.
dull brown or dark reddish brown, obliquely obovoid or oblong-ellipsoid.
dark brown or dull, obovoid.
= 28.
= 28, 56.
Senna corymbosa
Senna artemisioides
Senna corymbosa has been cultivated for over two centuries and is a common ornamental in many botanical gardens worldwide; it has become naturalized in warmer western Europe and South Africa (H. S. Irwin and R. C. Barneby 1982).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Due to its remarkable morphological and genetic variation (especially in leaflet number and form), Senna artemisioides has a shifting taxonomic history. The species, as circumscribed by Randell, was divided into several morphological forms by B. R. Randell and B. A. Barlow (1998). Senna artemisioides, as presented here, encompasses four common morphological forms found in North America: subsp. filifolia Randell, subsp. petiolaris Randell, nothosubsp. sturtii (R. Brown) Randell, and subsp. zygophylla Randell. D. E. Symon (1998) considered individuals of subsp. petiolaris characterized by arcuate phyllodes to be a separate species, S. phyllodinea (R. Brown) Symon, mainly because of the absence of individuals with an intermediate leaf morphology transitioning to the phyllode shape. Although this argument is reasonable, S. phyllodinea has not been accepted and adopted in other floristic studies. It must be noted that phyllodes consist of the lateral compression of both the petiole and the rachis, and not only of the petiole, as reported by Randell and Barlow. Along the adaxial margin of the phyllode, there is, in fact, a reduced extrafloral nectary at each insertion place of the suppressed leaflets.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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