666 | OXALIDACEAE 
1. Monoxalis dichondraéfolia (A. Gray) Small. Foliage closely pubescent with 
short gray hairs. Stems woody below, the branches tufted, more or less spreading or 
decumbent, 1-3 dm. long: leaves rather numerous: leaflet 1, the blade suborbicular, 
inclined to obovate, oblong or ovate, 1-3 em. long, retuse and somewhat apiculate at the 
apex, undulate, ciliate, cordate at the base: pedicels 0.5-1 cm. long, with 2 bracts like the 
stipules, enlarged upward : sepals lanceolate or triangular-lanceolate, 5-10 mm. long, acute 
or acuminate, auriculate-cordate at the base: petals about twice as long as the sepals, erose- 
undulate at the apex, the claw about as long as the blade: capsules oblong or ovoid- 
oblong, 8-10 mm. long, about as long as the sepals: seeds about 2 mm. long, with promi- 
nent somewhat confluent tubercles, lustrous. [Oxalis dichondraefolia A. Gray. ] 
In dry soil, southern and south western Texas and adjacent Mexico. Spring to fall. 
4. LOTOXALIS Small. 
Perennial caulescent herbs, with horizontal rootstocks. Stems branched at the base, 
the branches woody below, corymbosely branched above. Leaves alternate: petioles 
without stipules: blades pinnately 3-foliolate : leaflets more or less oblique. Peduncles 
axillary, topped by umbel-like cymes. Pedicels recurved before and after flowering, not 
deflexed. Flowers perfect. Sepals 5, thin, acute, erect, imbricated. Petals yellow, much 
longer than the sepals. Stamens 10: longer filaments ciliate. Stigmas 2-cleft. Capsule 
oblong-ovoid, surpassing the sepals, drooping. Seeds slightly flattened, with 5-8 longi- 
tudinal rows of sharp tubercles. WooD-soRREL. 
1. Lotoxalis Berlandiéri (Torr.) Small. Rootstocks woody. Foliage gray or 
tawny-pilose. Stems branched at the base, the branches erect or ascending, 5-25 cm. long, 
woody below, commonly branched : leaflets 3, the blades thickish, cuneate, obovate or ob- 
long, 5-20 mm. long, unequally notched at the apex, ciliate, mostly pubescent on both 
surfaces, rounded at the base, the lateral much smaller than the terminal : pedicels often 
3, recurved at maturity : sepals oblong, 5-8 mm. long: petals yellow, about twice as long 
as the sepals: longer filaments ciliate : capsules oblong-ovoid, 7-8 mm. high, depressed at 
the apex : seeds fusiform or nearly elliptic, 1.5-2 mm. long, with sharp tooth-like tubercles 
in longitudinal rows. [Oxalis Berlandieri Torr. | 
In dry or sandy soil, southern Texas and adjacent Mexico. Spring to fall. 
5. XANTHOXALIS Small. 
Annual or perennial caulescent herbs, with descending or horizontal rootsocks. Stems 
sometimes woody at the base. Leaves alternate: stipules obsolete or appearing as narrow 
dilations at the base'f the petiole : blades palmately 3-foliolate ; leaflets broadly obcordaté, 
usually inequilateral, nearly sessile or rarely stalked, sometimes sensitive. Flowers per^ 
fect, heterogonous or homogonous. Sepals 5, narrow, imbricated. Corolla yellow, some- 
times with a darker eye. Petals 5, surpassing the sepals, rounded or notched at the apex. 
Stamens 10: filaments glabrous or the longer ciliate. Capsule more or less elongated, 
columnar or natrowed upward, angled, 5-celled. Seeds several in each cavity, trans- 
versely ridged or tuberculate by broken ridges. YELLOW Woop-soRREL. SOUR-GRASS 
Plants with ereeping elongated stems or branches. ; 
Sepals ciliate at the tip or only near it: longer filaments glabrous. 1. X. corniculata. 
Sepals ciliate nearly all around : longer filaments ciliate above. 2. X. Langloisit. 
Plants with erect stems, or if branched at the base the branches sometimes decum- 
bent, often witb horizontal rootstocks. 
Stems and petioles strigillose with decidedly appressed hairs. 
Longer filaments ciliate above. 
Sepals 2-4 mm. long, ciliate mainly or only at the tip: corolla pale yellow, 
0.5-1.5 em. broad. 
Sepals 4-5 mm. long, copiously ciliate all around : corolla golden yellow, 
1.5-2.5 em. broad. 
Longer filaments glabrous. 
3. X. filipes. 
4 
Leaflets strigillose: sepals copiously ciliate : corolla golden yellow. 5. X. Texana. 
6 
. X. macrantha. 
Leaflets glabrous or merely with a few scattered hairs: sepals sparingly , 
ciliate : corolla pale or light yellow. . X. stricta. 
Stems and petioles villous or with loosely spreading hairs. 
A. Pedicels with erect or appressed hairs. 
Longer filaments glabrous. 
Sepals ciliate nearly all around: leaflets bright green. 7. X. Bushti. 
Sepals ciliate only at the apex : leaflets reddish purple. 8. X. rufa. 
Longer filaments ciliate above or throughout. 
Leaf-blades red or purple. 9. A. cotone 
Leaf-blades bright green. 
a. Sepals ciliate nearly all around: leaflets mainly less than 15 mm. broad. 
