Vascular Plants of North Carolina
Account for Slender Yellow Woodsorrel - Oxalis dillenii   Jacquin
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Section 6 » Order Geraniales » Family Oxalidaceae
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AuthorJacquin
DistributionStatewide, though of sparse occurrence in the northern Mountains.

This is a very widespread species, ranging across Canada and the US, except for the Southwest.
AbundanceCommon in the Coastal Plain and Piedmont, but only fairly common to frequent in the Mountains, and scarce in the northern Mountains.
HabitatThe species has a wide array of habitats, but with confusion with the very similar O. florida and O. stricta, specifics are not clarified. It occurs in a variety of disturbed sites, such as lawns, roadsides, clearings, and other sunny to partly sunny sites. It is not normally found in forest interiors, where O. florida occurs.
PhenologyBlooms mainly in spring, but it can flower from March to October; fruits soon after flowering.
IdentificationThe many species of yellow-flowered Oxalis are quite similar to each other, with small details separating most. All are small, branched, with numerous 3-parted, clover-like leaves on long petioles, and inflorescences of bright yellow, 5-petaled flowers. This species grows to about 4-6 inches high and has a densely pubescent stem, "evenly strigose from base to peduncles and pedicels" (Weakley 2018). This species has its flowers (2-9) in umbels, with each flower arising from the same point; O. stricta has flowers in cymes. The very similar O. florida has the capsules glabrous or sparsely pubescent, whereas O. dillenii has densely pubescent capsules. O. florida also has stems that are not as hairy, and has strigose hairs only on the stalks of the leaves or flowers. Though O. dillenii is a native species, it is weedy and behaves and occurs in ruderal sites, where exotic species are expected to grow. Note that O. stricta -- normally with rather smooth stems -- also is very weedy and grows in the same habitats, and is also quite common in most of the state.
Taxonomic CommentsSome older references had this species included within O. stricta. There has also been some confusion in the literature between this species and O. florida.

Other Common Name(s)Southern Yellow Woodsorrel
State RankS5
Global RankG5
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