28 NORTH AMERICAN FLORA [Volume 25 



1. Bolboxalis cernua (Thunb.) Small. 



( ' i alts cernua Thunb. Diss. Oxalis 14. 1781. 



? Oxalis Ehrenbergii Schlecht. Hort. Hal. 11. 1841. 



Plants l^l- dm. tall, bright-green ; leaflets 2-3.5 cm. broad, the blades very broadly 

 obcordate, glabrous or sometimes pubescent beneath ; peduncles surpassing the leaves, 

 glabrous, at least in age ; pedicels 4-20, more or less pubescent ; sepals lanceolate to linear- 

 lanceolate, 4.5-6.5 mm. long, the outer ones more pubescent than the inner ; petals deep- 

 yellow, 2-3 cm. long; filaments glabrous; gynoecium pubescent; capsules 5-8 mm. long. 



Type locality : Cape of Good Hope. 



Distribution: South Africa. Widely cultivated and naturalized in tropical and subtropical 

 countries. Found in our range in Florida and Mexico, and in Bermuda. 

 Illustrations: Jacq. Oxal. Monogr. pi. 6 ; Lodd. Bot. Cab. pi. 1154. 



5. IONOXALIS Small, PI. SE. U. S. 665. 1903. 



Perennial succulent herbs with the leaves and scapes arising from scaly bulbs. Leaves 

 alternate, but all basal ; petioles elongate, dilated at the base ; blades palmately 3-several- 

 foliolate, the leaflets with narrow, cuneate, obdeltoid, obreniform, or suborbicular entire or 

 lobed blades. Flowers borne in umbel-like simple or compound cymes which are subtended 

 by several bracts. Sepals 5, each with one or two pairs of apical tubercles, or more, the 

 inner ones often slightly narrower than the outer. Petals 5, violet, blue, red, or white. Sta- 

 mens 10 ; filaments united at the base, the longer ones sometimes appendaged on the back. 

 Ovary elongate ; st3des stout, or elongate and slender ; stigmas slightly introrse or nearl}' 

 terminal, not lobed. Capsule erect. 



Type species, Oxalis violacea L. 



Leaf -blades 4-several-foliolate. 



Longer filaments appendaged on the back. 

 Blades of the leaflets not lobed. 



Leaflets with narrow blades which are usually of a linear, cuneate, or spatulate type. 

 Leaflets bearing marginal tubercles near the apex. 1. /. Conzaltiana. 



Leaflets without marginal tubercles. 



Corolla deep-purple or violet ; sepal-tubercles elongate. 



Sepals glabrous ; blades of the leaflets linear or nearly so. 2. I. Gonzalesii. 

 Sepals pubescent ; blades of the leaflets cuneate. 3. /. magnified. 



Corolla crimson ; sepal-tubercles short. 4. /. lasiandra. 



Leaflets with broad blades which are of an obovate, obdeltoid or 

 suborbicular type. 

 Corolla violet or deep-purple ; leaflets not blotched. 



Blades of the leaflets obovate, usually broadly so ; pedicels 

 glabrous, or slightly villous under the calyx. 

 Sepals linear to linear-lanceolate, each with 2 apical 

 tubercles. 

 Outer sepals 5.5-6.5 mm. long, the tubercles short ; 



leaflets white beneath. 5. I.multiceps. 



Outer sepals 7.5-9 mm. long, the tubercles elongate ; 

 leaflets green beneath. 6. I. Nelsonii, 



Sepals broadly oblong to oblong-obovate, each with sev- 

 eral apical tubercles. 7. /. cuernavacana. 

 Blades of the leaflets obdeltoid in outline ; pedicels viscid- 

 pubescent. 8. /. Rosei. 

 Corolla red ; leaflets blotched. 9. /. Deppei. 

 Blades of the leaflets lobed. 



Leaflets with blades as broad as long or broader, obdeltoid in out- 

 line or obcordate. 

 Blades of the leaflets shallowly lobed. 



Sepals glabrous ; lobes of the leaflets directed forward. 

 Sepals oval or somewhat obovate. each with 4 short apical 



tubercles ; blades of the leaflets notched at the apex. 10. /. occidentalis. 

 Sepals oblong or nearly so, each with 2 often lobed apical 

 tubercles. 

 Tubercles of the sepals short, entire ; leaflets uni- 

 formly green above, notched at the apex. 11. /. caerulea. 

 Tubercles of the sepals long, lobed ; leaflets mottled 

 above, broadly scalloped at the apex. 12. I. scopulorum. 

 Sepals pubescent ; lobes of the leaflets spreading. 13. /. tetraphylla. 

 Blades of the leaflets deeply lobed. 14. /. divaricata. 

 Leaflets with blades much longer than wide, mostly cuneate in 

 outline. 

 Styles glabrous; blades of the leaflets broadly refuse. 15. /. oaxacana. 



