Oxalis dillenii
Oxalis brasiliensis
common yellow wood-sorrel, Dillen's oxalis, graygreen sorrel, slender yellow wood-sorrel, southern yellow wood-sorrel
Brazilian wood-sorrel
(1–)2–8 from base, erect initially, often becoming decumbent or prostrate and stolonlike, rarely rooting at nodes, 10–25 cm, usually herbaceous, sometimes becoming woody proximally, densely and evenly strigillose to strigose from base to peduncles and pedicels, hairs straight, antrorsely appressed, nonseptate, sharp-pointed.
basal and cauline;
stipules oblong, margins narrowly flanged or without free portions, apical auricles absent;
petiole 1–4 cm, hairs nonseptate;
leaflets 3, green, obcordate, (4–)6–15(–21) mm, lobed 1/5–1/3 length, abaxial surface sparsely strigillose, adaxial surface glabrous, oxalate deposits absent.
basal;
petiole often purplish proximally, 3–13[–20] cm, glabrous [sparsely and finely strigose];
leaflets 3, light green, obdeltate with rounded angles, [2–]10–21[–32] mm, lobed 1/10–1/20 length, lobes apically shallowly convex to nearly truncate, margins glabrous or sparsely irregularly ciliate, hairs loose, fine, abaxial surface sparsely but evenly strigose, adaxial surface glabrous, oxalate deposits absent.
usually umbelliform cymes, rarely irregular cymes, 1–3(–8)-flowered;
peduncles 1–6(–10) cm.
umbelliform cymes, 1(–2)[–5]-flowered;
scapes 14–17[–30] cm, glabrous.
mostly homostylous;
sepal apices without tubercles;
petals yellow, without red lines, (2.5–)4–8 mm.
apparently tristylous (mid-styled flowers observed);
sepals purplish, apices without tubercles, surfaces glabrous;
petals violet-purple, with dark purple veins proximally, 18–20 mm.
angular-cylindric, abruptly tapering to apex, 12–20(–25) mm, densely strigose-pilose, hairs both appressed and spreading, with puberulent understory.
narrowly cylindric, 15–22 mm, indumentum not seen.
brown, transverse ridges with strong grayish or white lines.
= 18, 20, 22, 24.
Oxalis dillenii
Oxalis brasiliensis
Decumbent stems of Oxalis dillenii often appear stolonlike, producing erect branches and leaves at the nodes, rarely producing a few adventitious roots. Such plants sometimes are misidentified as O. corniculata, but they differ in their overall habit, stems and rhizomes that become woody, reduced stipules, strigillose cauline vestiture, denser fruit vestiture, and seed color. Plants of O. dillenii in Canada and the western United States appear to be adventive.
Plants of Oxalis dillenii flowering into November and December in Texas and North Carolina, and probably elsewhere, characteristically are depressed in habit, with creeping stems and forming matlike colonies. The corollas are small, with petals 2.5–3 mm. Although similar in habit to typical O. corniculata, these plants do not have stems that root at nodes, and the strigillose vestiture, though reduced in density, and the stipule morphology are like O. dillenii. Whether these are the same genotype as spring-flowering plants or a different entity remains to be investigated. At least some of the variability in O. dillenii, particularly in habit, may be genetically partitioned, as dysploid chromosome races apparently exist.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Oxalis brasiliensis is naturalized in Dallas County (H. E. Horne et al. 2013). The species is recognized by its leaves without oxalate deposits and sepals without tubercles; outer bulb scales with five to eight (to 13) nerves; one or two (or three) flowers per scape; and violet-purple, dark purple-veined corollas. The large, showy flowers make this species popular in the horticultural trade (see http://www.pacificbulbsociety.org/pbswiki/index.php/SouthAmericanOxalis#brasiliensis for additional horticultural information on the species). Growth habit in the Dallas County population ranged from small clumps to dense mats along the roadside, extending to the margin of the woodland.
A low percentage of the Dallas County Oxalis brasiliensis population was reproducing by tiny propagules produced at the bract region of the scape. These propagules apparently are highly foreshortened stems, as they produce whorls of small leaves; they do not produce scales and thus are not the so-called aerial bulbils, as in the miniature bulbs described in some South African species (see http://www.pacificbulbsociety.org/pbswiki/index.php/SouthAfricanOxalis).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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