Oxalidaceae 243 
CC. Sepals awnless; seeds smooth or striate. 
E. Anther-bearing stamens 10: ovary glabrous, transversely rugose. W. 
G. molle L. (Dove’s-foot Geranium) 

FE. Anther-bearing stamens 5; ovary pubescent, not rugose. W. E. 
G. pusillum Burm. (Small Geranium) 
ERODIUM HERON’S-BILL 
Leaves opposite or alternate, simple or compound; stipules present. Flowers in 
axillary umbels, nearly regular. Upper 2 petals slightly smaller. Anther-bearing sta- 
mens 5, alternate with 5 sterile filaments. Stigmas 5, ovules 2 in each cavity. Styles de- 
hiscent, coiled spirally at maturity, villous-bearded on the inner side. Seed | in each 
lobe, not reticulate. (Gk. erodios—a heron; referring to the long beak of the pod.) 



A. Leaves round-reniform to triangular-ovate, crenately dentate. U. 
E. macrophyllum H. & A. 
AA. Leaves pinnately compound or pinnatifid. 
B. Leaflets unequally and doubly serrate; sepals 6—8 mm. long, not bristle-tioped; 
plant with a musk odor; anther-bearing filaments 2-toothed. U. 
E. moschatum L’Her. F 
| BB. Leaflets laciniately pinnatifid into narrow acute lobes: sepals 2—6 mm. long, 
bristle-tipped; plant without musk odor; filaments not toothed. W. E. 
E. cicutarium L’Her. 
OXALIDACEAE Wood-sorrel Family 
Herbs (ours) or shrubs, annual or perennial, often with rhizomes (so in ours) 
or scaly bulbs; sap sour. Leaves mostly with 3 leaflets (so in ours), in some (not ours) 
pinnate or entire and peltate; stipules usually present as scarious expansions of the petiole- 
base; leaflets usually obcordate (so in ours). Flowers perfect, in umbel-like or forked 
cymes, or sometimes solitary; peduncles mostly long. Sepals 5, often unequal. Petals 
5, white or pink or purple or yellow. Stamens 10—15. Pistil 1; ovary superior, 5-Celled, 
5-lobed; styles united or distinct (ours) ; ovules 2 to many in each cell. Fruit a capsule 
(ours), rarely berry-like, loculicidal, globose or columnar. 



OXALIS WOOD-SORREL 
Leaves alternate, basal or cauline. Flowers on axillary or basal peduncles, regular. 
Stamens 10, monadelphous at base, 5 longer and 5 shorter, all anther-bearing. Styles 
5, persistent; stigmas terminal. Seeds 2 or more in each cell, with loose outer coat. (Gk. 
oxus—sour; from the taste of the herbage.) 
A. Flowers yellow; stem erect, |—3 dm. high. W. (O. suksdorfii.) 
0. pumila Nutt. (Yellow Wood-sorrel) 
AA. Flowers white or pinkish; stem none, the leaves and scapes from horizontal rhi- 
_zomes. 
B. Scapes 1-flowered, shorter than the leaves; petals 16—25 mm. long; capsule 
ovoid, | cm. long. W. C. 0. oregana Nutt. 
BB. Scapes about 6-flowered, as long as the leaves; petals 6—12 mm. long; cap- 
sule linear, 2—3 cm. long. W. C. 
QO. trilliifolia Hook. 

