666 



OXALIDACEAE 



1-3 cm. long, cordate at the base: sepals lanceolate to triangular-lanceolate, acute: 

 petals yellow: capsules 8-10 mm. long. 



In dry soil, southern Texas and adjacent Mexico. Spring to fall. 



5. LOTOXALIS Small. 



Herbs. Leaf -blades pinnately 3-foliolate: leaflets more or less oblique. Flowers 

 in umbel-like cymes. Sepals 5, not auricled. Longer filaments pubescent. Capsules 

 short, drooping. WOOD-SORREL. 



1. Lotoxalis Berlandteri (Torr.) Small. Plants 5-25 cm. tall, pilose: blades 

 of the leaflets cuneate, obovate or oblong, 5-20 mm. long, that of the terminal one 

 the largest: sepals oblong to lanceolate: petals yellow: capsules 7-8 mm. long. 



In dry soil, southern Texas and adjacent Mexico. Spring to fall. 



6. XANTHOXALIS Small. 



Herbs. Leaf -blades palmately 3-foliolate: leaflets notched at*the apex. Flowers 

 in umbel-like or dichotomous cymes. Sepals 5, the inner narrower than the outer 

 ones. Filaments glabrous or the longer ones pubescent. Capsules elongated, erect. 

 SOUR-GRASS. YELLOW WOOD-SORREL. 



X. filipes. 

 X. macrantha. 

 X. Texana. 

 X. stricta. 



Plants with creeping elongated stems or branches. 



Sepals ciliate at the tip or only near it: longer filaments glabrous. 1. X. c.orniculata 



Sepals ciliate nearly all around: longer filaments ciliate above. 2. X. Langloisii. 



Plants with erect stems, or if branched at the base the branches sometimes 



decumbent, often with 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 cm. broad. 

 Sepals 4-5 mm. long, copiously ciliate all around: corolla golden 



yellow, 1.5-2.5 cm. broad. 

 Longer filaments glabrous. 



Leaflets strigillose: sepals copiously ciliate: corolla golden yellow. 

 Leaflets glabrous or merely withja few scattered hairs: sepals sparingly 



ciliate: corolla pale or light yellow. 



Stems and petioles villous or with loosely spreading hairs. 

 Pedicels with erect or appressed hairs. 

 Longer filaments glabrous. 



Sepals ciliate nearly all around: leaflets bright green. 7. X. Bushii. 



Sepals ciliate only at the apex: leaflets reddish purple. 8. X. rufa. 



Longer filaments ciliate above or throughout. 



Leaf-blades red or purple. 9. X. colored. 



Leaf-blades bright green. 



Sepals ciliate nearly all around: leaflets mainly less than 15 

 mm. broad. 



Short styles with recurved tips during anthesis: co- 



rolla golden yellow. 10. X. recurva. 



Short styles with erect tips during anthesis: corolla 



light yellow. 11. X. Brittoniae. 



Sepals ciliate only at the apex or near it: leaflets mainly 



over 20 mm. broad. 



Leaflets strigillose, the margins green: capules 10-12 mm. 12. X. interior. 

 Leaflets essentially glabrous except the brown ciliate 



margins: capsules 8-10 mm. long. 13. X. grandis. 



Pedicels villous or loosely pubescent. 



Sepals ciliate only at tip, 3.5-5 mm. long: cymes dichotomous: 



petals 7-10 mm. long. 14. X. cymo a. 



Sepals ciliate all around, about 7 mm. long: cymes umbel-like: petals 



about 15 mm. long. 

 Petals glabrous: longer filaments glabrous: stem copiously pu- 



bescent. 15. X. hirsuticaulis. 



Petals pubescent without: longer filaments ciliate above: stem 



with few scattered hairs. 16. X. Priceae. 



1. Xanthoxalis corniculata (L.) Small. Stem branched at the base, the branches 

 0.5-4 dm. long, creeping, somewhat pubescent with loose, spreading hairs: leaflets 

 deep green, the blades 5-12 mm. broad or sometimes larger, ciliate and com- 

 monly with scattered hairs on the surface: pedicels minutely strigillose: sepals 

 oblong to oblong-lanceolate, 3-4 mm. long, ciliate at the apex or only near it: petals 

 7-10 mm. long: filaments glabrous: capsule &-13 mm. long. [Oxalis corniculata L.] 



In waste places and in fields and on roadsides, New Jersey to the Indian Territory and 

 the Gulf States. Adventive as far north as Ontario. Also in the tropics. Throughout 

 the year. 



