142 KEY AND FLORA 
49. OXALIDACEA. Woop Sorreyt FamiLy 
Herbs or woody plants. Leaves compound. Flowers in fives, 
bisexual, actinomorphic, hypogynous. Stamens 10, somewhat 
monadelphous at the base. Ovary with several ovules in each 
cell. Fruit a capsule. 
OXALIS L. 
Acid herbs. Leaves basal or alternate, with or without 
stipules, usually of 3 leaflets, which droop at night. Sepals 5. 
Petals 5. Stamens 10. Ovary 5-lobed, 5-celled; styles 5. 
1. 0. Acetosella L. Woop Sorrez. Apparently stemless, from a 
creeping, scaly rootstock. Leaves all basal, long-petioled, of 3 in- 
versely heart-shaped leaflets ; scape slender, 2-5 in. high, 1-flowered. 
Flowers nearly 1 in. in diameter, white, veined with red or purple. 
Cold woods N. 
2. O. violacea L. Viorer Woop Sorrer. Perennial from a 
bulbous root, apparently stemless. Leaves long-petioled; leaflets 
inversely heart-shaped, sometimes slightly downy, often with a dark 
zone near the middle. Scapes usually longer than the petioles, um- 
bellately 4-10-flowered; pedicels slender. Flowers violet-purple, nod- 
ding. Petals obtuse, 2-3 times as long as the sepals; scapes and 
petioles 4-5 in. long. Common in rich woods.* 
3. 0. corniculata L. Coxon YELLow Woop Sorrex. Probably 
flowering the first year but perennial, propagated by slender whitish 
rootstocks. Erect or decumbent, often sparsely hairy, usually 1 ft. 
or less in height. Stem leafy, the leaves often appearing whorled. 
Leaflets thin, green or purplish, often ciliate. Peduncles few-flowered, 
the ascending pedicels, clad with spreading hairs, forming unsym- 
metrical umbels or cymes at their summits. Flowers yellow, about 
+ in. in diameter. Pods hairy, columnar, grooved, often } in. or more 
in length. A common weed in light soil. 
50. TROPAOLACEZR. Inpran Cress FAMILy 
Smooth and tender herbaceous plants, with biting juice, often 
climbing by the petioles of their simple leaves. Leaves alter- 
nate, without stipules. Peduncles axillary, 1-flowered. Sepals 
3-5, the upper one with a long, distinct spur. Petals 1-5, 
hypogynous, not always all alike. Stamens 6-10, perigynous, 
