Oxalis stricta common yellow oxalis Oxalidaceae OXST; Bx, br, pb, sd, sf, up, vc, wv (Yost et al. 1991); NY (DeCandido 2001); Q, a, cu, ft, j; K, p; R, al, bm, cl, js, sv, w;


Oxalis stricta.www.plantsystematics.org

Oxalis stricta. Robbin Moran.www.plantsystematics.org (Accessed 4/2014)

Oxalis stricta is a perennial herb to 50 cm tall, colonial from long thin, pale, succulent, rhizomes, branching and sending up new shoots, roots associated with VA mycorrhizas (Brundrett and Kendrick 1988); stem usually erect, hairy, some hairs septate, base of stem often reddish; no stipules. 

Leaves alternate, 3-parted, leaflets heart-shaped, notched at tip, bright green, somewhat succulent, sour to taste, to 3 cm wide, leaf stalk unlobed. Leaves folded at midday and during night.

Flowers yellow, 5-parted, radially symmetrical, petals 0.4-0.9 cm long, self-fertile (autogamous), (Mulligan and Kevan 1973), inflorescence branched with oldest flower at top. 

Fruit stalk horizontal or erect, not sharply bent downward; capsule 5-parted, green, ribbed, 0.8-1.5 cm long, hairs, if any, septate; seeds numerous, brown ridged; seeds eaten by birds and mammals. 

Wetland status: UPL. 

Frequency in NYC: Occasional.

 Origin: Apparently native to North America.

 Habitat: Open areas and part shade in disturbed soil, gardens, roadsides, trail edges. 

Notes: Plants eaten by some mammals (Martin et al. 1951). Attacked by the maize rust fungus Puccinia sorghi and other species of Puccinia (Lovett-Doust et al. 1985). Very similar to O. dillenii, difficult to distinguish.