Oxalis drummondii
Oxalis florida
Drummond's wood-sorrel
flowering yellow wood sorrel, slender eastern wood-sorrel
usually 1 from base, usually erect, rarely leaning and decumbent, not rooting at nodes, (5–)8–30(–35) cm, herbaceous, glabrous, glabrate, or sparsely to moderately strigose, sometimes sparsely villous proximally, hairs slightly curved, antrorse, nonseptate.
basal;
petiole 5–16 cm;
leaflets 3, green, sometimes with red splotches in irregular medial band adaxially, obtriangular to obcordate, (6–)14–34 mm, lobed 1/4–4/5 length, lobes apically convex to nearly truncate, surfaces glabrous, oxalate deposits absent.
basal and cauline;
stipules rudimentary;
petiole 2–5 cm, hairs nonseptate;
leaflets 3, green, obcordate, 4–11 mm, lobed 1/5–1/3 length, abaxial surface sparsely strigose, adaxial surface glabrous, oxalate deposits absent.
umbelliform cymes, 3–10-flowered;
scapes (7–)11–23 cm, glabrous.
umbelliform cymes, 1–2(–3)-flowered;
peduncles (2–)3–8 cm.
distylous or rarely homostylous;
sepal apices with 2(–6) orange, linear, thickened, apically confluent tubercles;
petals white to pale green proximally with green veins, pink to violet or purple-violet distally, (8–)15–23 mm.
tristylous, at or slightly above level of leaves;
sepal apices without tubercles, surfaces glabrous;
petals yellow, sometimes with faint red lines proximally, 4–8 mm.
cylindric, 4–12 mm, hairy.
angular-cylindric, abruptly tapering to apex, 7–10 mm, glabrous or glabrate to sparsely puberulent, hairs short, sometimes only along angles.
brown, transverse ridges brown.
= 14.
= 16.
Oxalis drummondii
Oxalis florida
Oxalis drummondii is found in the flora area in central and southern Texas. Reports of this species from Arizona, New Mexico, and trans-Pecos Texas are based on misidentifications of O. latifolia and O. metcalfei.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Oxalis florida is recognized by its mostly erect stems, thin stems and peduncles (compared to other species), sparsely strigose cauline vestiture of relatively short, slightly curved hairs, rudimentary stipules, and relatively small flowers with petals that usually lack red lines proximally. It is a species primarily of the Atlantic states and Gulf coast, but it also occurs in Arkansas, Louisiana, southwestern Mississippi, Missouri, and Texas, apparently disjunct westward from its main range.
Intermediates between Oxalis florida and O. colorea apparently occur where their ranges come into contact. According to G. Eiten (1963), O. florida intergrades with O. dillenii in forming intermediate homogenous populations as well as hybrid swarms. Eiten treated O. florida as O. dillenii subsp. filipes, but D. B. Ward (2004) noted that the differences between O. florida and O. dillenii are appreciable and intermediates seem few. K. M. Wiegand (1925) observed that O. florida and O. filipes have the appearance of hybrids between O. stricta and either O. dillenii or O. corniculata but that their absence in much of the region where the possible parents both occur argues against this hypothesis.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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