664 OXALIDACEAE 



11. Cathartolinum altum Small. Stems 1-1.5 dm. tall: leaf -blades linear to 

 linear-lanceolate, 1-2 cm. long: outer sepals ovate to oblong-ovate, 5-6 mm. long: 

 capsules broadly ovoid, about 4 mm. long. 



In dry soil, Texas. Spring to fall. 



12. Cathartolinum Carter! Small. Stems 1-3 dm. tall : leaf -blades narrowly 

 linear to linear-subulate, mostly 1.5-2.5 cm. long: outer sepals lanceolate to ovate- 

 lanceolate, 4.5-5 mm. long: capsules about 4 mm. long. 



In pine lands, southern peninsular Florida. Spring. 



13. Cathartolinum elongatum Small. Stems 2-3.5 dm. tall: leaf -blades linear- 

 spatulate on the lower part of the stem, narrowly linear above, 2-4 cm. long, about 

 twice as long as the lower ones: outer sepals linear-lanceolate, becoming 11-14 mm. 

 long, slender-tipped, quite evenly glandular-toothed: capsules not seen. 



In gravelly and sandy places, southern Texas. Spring. 



14. Cathartolinum rigidum (Pursh) Small. Stems 1-5 dm. tall: leaf -blades 

 linear to linear-lanceolate, 0.6-2.5 mm. long: outer sepals lanceolate to oblong- lance- 

 olate, 5-7 mm. long: capsules ovoid, 4-5 mm. long. 



In dry soil, Manitoba to Texas, Arizona and Mexico. Summer. 



15. Cathartolinum Berlandteri (Hook.) Small. Stems 1-2.5 dm. tall: leaf- 

 blades lanceolate to linear, 1-2.5 cm. long: outer sepals lanceolate, 811 mm. long: 

 capsules globose-ovoid, 4-4.5 mm. long. 



In dry soil, Texas. Spring and summer. 



16. Cathartolinum sanctum Small. Stems 1.5-3 dm. tall: leaf -blades narrowly 

 oblong to linear-oblong, 1.5-3.5 cm. long: outer sepals lanceolate, 10-12 mm. long: 

 capsules not seen. 



In dry soil, southern Texas. Summer. 



17. Cathartolinum multicaule (Hook.) Small. Stems or branches tufted, 1-3 

 dm. tall: leaf -blades linear to linear-subulate, 3-8 mm. long: outer sepals 4.5-5 mm. 

 long, the body elliptic to oval : capsules subglobose, 4 mm. long. 



On plains and prairies, Texas. Spring and summer. 



FAMILY 4. OXALIDACEAE Lindl. WOOD-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- 

 time 1-foliolate, usually pinnate or digitate: leaflets commonly notched at the 

 apex. Flowers perfect, essentially regular, solitary or in axillary or terminal, 

 peduncled, umble-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, with short or long rootstocks, succulent: corolla not yellow, 



except in Bolboxalis. 

 Sepals without apical tubercles: rootstocks elongated, merely scaly at the apex. 



1. OXALIS. 

 Sepals with apical tubercles: rootstocks bulb-like, solitary or several and 



connected borne at the nodes of a long rootstock. 



Plants with long rootstocks which bear bulblets at the nodes. 2. BOLBOXALIS. 



Plants with coated bulbs. 3. IONOXALIS. 



Plants caulescent, annual or perennial, not succulent; corolla yellow. 



Leaf-blades 1-foliolate: stipules free, bristle-like. 4. MONOXALIS. 



Leaf-blades 3-foliolate: stipules adnate, a dilation of the base of the petioles 

 of obsolete. 



