664 OXALIDACEAE 
22 Linum Berlandiéri Hook. Annual or perhaps perennial, nearly glabrous. 
Stems simple, 1-2.5 dm tall, or branched at the base, the branches erect or ascending, 
corymbose: leaves clear green ; blades lanceolate or linear, 1-2.5 em. long, spreading or 
ascending, acuminate, the lateral nerves marginal: pedicels stout, angled. longer than the 
calyx : outer sepals lanceolate, 8-11 mm. long, acuminate, copiously glandular-serrate ; 
inner sepals nearly like the outer but with slightly finer teeth : corolla yellow, 4-4.5 em. 
broad : capsules globose-ovoid, 4—4.5 mm. long, obtuse, much shorter than the sepals. 
On plains and praries, Texas, Spring and summer. 
13. Linum sanctum Small. Annual or perennial, deep green. Stems 1.5-3 dm. 
tall, corymbosely branched above : leaves approximate ; blades narrowly oblong to linear- 
oblong, 1.5-3.5 em. long, ascending, the lateral nerves not marginal: pedicels shorter 
than the calyx : outer sepals lanceolate, 10-12 mm. long, acuminate, rather sparingly gland- 
ular toothed ; inner sepals much shorter than the outer but with many approximate finer 
teeth : corolla yellow, about 3 em. broad : capsule not seen. 
On plains or prairies, southern Texas. Summer. 
14. Linum multicaüle Hook. Annual or perhaps perennial, puberulent. Stems 
more or less densely tufted, 1-3 dm. tall, simple or corymbosely branched above: leaves 
numerous, firm, appressed or erect, commonly imbricated ; blades linearor linear-subulate, 
3-8 mm. long, acute, finely ciliate: pedicels stout, mostly longer than the sepals: outer 
sepals 4.5-5 mm. long, each with an elliptic to oval ciliate body and a subulate terminal 
awn ; inner sepals similar but slightly smaller : corolla yellow, 1.5 cm. broad : capsules sub- 
globose, 4 mm. long, shorter than the sepals. 
On plains and prairies, Texas. Spring and summer. 
FAMILY 4. OXALIDACEAE Lindl. Woop-sorrEL FAMILY. 
Annual or perennial acaulescent or leafy-stemmed herbs, or rarely shrubs, 
with rootstocks or scaly bulbs, and a sour sap. Leaves basal or cauline: petioles 
with free or adnate stipules, or these obsolete: blades usually 3-foliolate, some- 
times 1-foliolate, usually pinnate or digitate: leaflets commonly notched at the 
apex. Flowers perfect, essentially regular, solitary or in axillary or terminal, 
peduncled, umbel-like or dichotomous cymes. Calyx of 5 often unequal, imbri- 
cated, persistent sepals. Corolla of 5 white, pink, rose, purple or yellow convo- 
lute petals, usually broadened upward, entire or notched at the apex. Androe- 
cium of 10-15 stamens, or twice or thrice as many as the sepals.. Filaments 
united below, in 2 sets of different lengths. Gynoecium of 5 united carpels. 
Ovary 5-celled, 5-lobed. Styles 5, distinct. Stigmas capitate. Ovules 2-many 
in each cavity. Fruit a globose or columnar loculicidal capsule, or rarely berry- 
like. Seeds with a dehiscent arilloid outer coat and a firm, often ridged, inner 
coat. Embryo straight in fleshy endosperm. Cotyledons flat. : 
Plants acaulescent, perennial, succulent: corolla not yellow. 
Rootstoeks elongated, scaly near the ends: flowers homogonous. 1. OXALIS. 
Rootstocks abbreviated, bulb-like : flowers heterogonous. 2. IONOXALIS. 
Plants caulescent, annual or perennial, not succulent: corolla yellow. 
Leaf-blades 1-foliolate : stipules free, bristle-like. 3. MONOXALIS. 
sera rene 3-foliolate : stipules adnate, a dilation of the base of the petioles or 
obsolete. 
Leaflets pinnate : ovary and capsule drooping, depressed at the apex : stigmas 
2 cleft. HT P ceps dra ite : 4. LOTOXALIS. 
Leaflets palmate: ovary and capsule erect, narrowed at the apex: stigmas 
cavttate: 7 TIS EET ea S 5. XANTHOXALIS. 
l. ÓXALIS L. 
Perennial herbs, with slender more or less scaly rootstocks. Leaves basal, solitary or 
several together : petioles dilated at the base ; blades palmately 3-foliolate ; leaflets notched 
at the apex, usually with a membranous fold in the sinus. Scapes solitary or several to- 
gether, topped by a single pedicel or rarely with an umbel-like cyme. Flowers perfect, 
homogonous. Sepals 5, the inner longer than the outer. Petals white or pink, delicate, 
much longer than the sepals, often obliquely notched at the apex. Stamens 10 : filaments 
commonly glabrous. Capsule relatively short. Seeds few or several in each cavity, 
pitted and grooved or striate. Woop-sORREL. 
. 1. Oxalis Acetosélla L.  Rootstocks slender, scaly at the ends. Foliage poni 
with scattered brownish hairs : leaves 2-6 together : leaflets 3, the blades obcordate, 
