346 OXALIDACEAE. (Vor. II. 
3. Oxalis corniculata L. Yellow Pro- 
cumbent Wood-sorrel. (Fig. 2252.) 
Oxalis corniculata I,. Sp. Pl. 435. 1753- 
Annual or perennial from creeping rootstocks, 
pubescent with appressed hairs or nearly glabrous, 
freely branching from the base and with a few 
branches above; stem 1/-6’ high, the branches 
diffuse, mainly procumbent and often rooting 
from the nodes. Leaflets obcordate, wider than 
long, about 4’ wide; petioles slender, dilated at 
the base into oblong rounded or truncate stipules; 
peduncles 1-3-flowered; flowers yellow, 2//-6/’ 
long; pedicels strigillose, more or less reflexed; 
capsule oblong, gradually narrowed to the apex, 
5/’-9’ long; appressed pubescent; sceds com- 
pressed, transversely ridged. 
In ballast about the eastern sea-ports, and fre- 
quently growing on the ground in greenhouses. 
Texas and throughout tropical America. Recently 
found in Ontario. Occurs also in warm and tropical 
regions of the Old World. Ladies’ Sorrel. Feb.-Nov. 
4. Oxalis filipes Small,n.sp. Slender Yel- 
low Wood-sorrel. (Fig. 2253.) 
Annual or perennial, very slender, sparsely pu- 
bescent with appressed hairs; stem erect, nearly 
simple, usually very leafy, wiry, 1o’-2° high. Leaves 
1{/-\%4/ wide, long-petioled, not stipulate, or the 
stipules represented by a narrow dilation of the base 
of the petiole; leaflets obcordate, with unequal sides, 
peduncles slender, equalling or exceeding the leaves, 
2-3-flowered; flowers yellow, in umbel-like cymes; 
pedicels very slender, strigillose or glabrate, recurved 
in mature fruit; sepals oblong-lanceolate, 2’’ long, 
obtuse with a tuft of hair at the apex; petals 4’’ long, 
emarginate; capsule 4//-6’’ long, gradually narrowed 
to the apex, often curved; seeds obovoid or oblong, 
14/ long, with continuous ridges. 
In woods, Virginia to Tennessee, south to Georgia and 
Tennessee. Plant smaller than the preceding, with the 
leaflets often dark-margined. May-Aug. 
5. Oxalis stricta L. Upright Yellow 
Wood-sorrel. (Fig. 2254.) 
Oxalis stricta I. Sp. Pl. 435. 1753. 
Oxalts corniculata var. stricta Sav. in Lam. Encycl. 
4: 683. 1797. 
Annual, or perennial, usually low and erect, pale 
green. Stem commonly branched at the base, 
the branches spreading, 5’-6’ long, more or less 
strigose; leaves 9//-11'4’ broad; leaflets coarsely 
cellular, very sensitive, closing when touched; 
petiole-bases narrowly dilated; flowers yellow, 
fragrant, in umbel-like cymes, peduncles 114/-6/ 
long, stout; pedicels at length deflexed; sepals 
linear or lanceolate, about 2%3’’ long, ciliolate, 
erect or ascending; petals 4’’/-5’’ long, commonly 
reddish at the base; capsule columnar, 8//-15// 
long, abruptly narrowed at the summit; seeds obo- 
void, or elliptic, about 14’ long, with interrupted 
transverse ridges. 
In woods and fields, Nova Scotia to Dakota and 
Colorado, south to Florida and Texas. Introduced 
into Europe as a weed. April-Oct. 
