Part 1, 1907] OXALIDACEAE 45 



ovate or orbicular-obovate, 2.5-6 cm. thick, deep-green and usually with scattered hairs 

 above, paler-green and more or less pubescent beneath, the lobes rounded ; scapes villous ; 

 cymes compound, usually many-flowered; pedicels 1-3 cm. long, appressed-pubescent ; 

 sepals oblong to linear, 4.5-6 mm. long, glabrous or nearly so, each bearing 2 thick apical 

 tubercles; petals violet or rose-purple, 12-15 mm. long; shorter filaments mostly gla- 

 brous ; longer filaments pubescent, unappeudaged. 



Type locality : Near Rio Janeiro, Brazil. 



Distribution : Florida, Mexico, northern South America and the West Indies. Also intro- 

 duced into the Old World. 



Doubtful species 

 Oxalis debilis H.B.K., Oxalis grandifolia DC, and Oxalis Schraderiana H.B.K., 

 natives of South America, have been reported as growing in Central America and Mexico. 

 Oxalis lilacina Klotzsch, described from Mexico. 



6. MONOXALIS Small, Fl. SE. U. S. 665. 1903. 



Perennial caulescent plants with woody rootstocks upon which the branching stems are 

 clustered. Leaves alternate, with free setaceous stipules ; petioles longer than the stipules; 

 blades 1-foliolate, the leaflet nearly sessile, with a broad entire blade. Flowers borne in 

 1- or 2-flowered cymes subtended by slender bracts which resemble the stipules. Sepals 5, 

 auricled at the base, persistent. Petals 5, yellow, spatulate, marcescent. Stamens 10, 

 the filaments united into a short tube at the base. Ovary short; styles clavellate. Cap- 

 sules short, 5-lobed, depressed at the apex, erect. Seeds about 3 in each carpel, tubercled. 



Type species, Oxalis dichondraefolia A. Gray. 



Outer sepals deltoid or triangular, several times wider than the inner ones ; 



blades of the leaflets truncate or retuse at the apex. 1. M. dichondraefolia. 



Outer sepals lanceolate, scarcely twice as wide as the inner ones ; blades 



of the leaflets rounded at the apex. 2. M. robusta. 



1. Monoxalis dichondraefolia (A. Gray) Small, Fl. SE. U. S. 666. 1903. 



Oxalis dichondraefolia A. Gray, PI. Wright. 1: 27. 1852. 



Stems or branches tufted, 5-30 cm. tall, herbaceous, pubescent with short gray 

 hairs ; leaflets as long as the petioles or shorter, the blades suborbicular to square-orbicular 

 inclined to obovate or ovate, 1-3 cm. long, truncate or retuse and more or less apiculate at 

 the apex, finely pubescent on both surfaces, mostly shallowdy cordate at the base; cymes 

 1-flowered ; bracts setaceous, 10 mm. long or shorter; sepals becoming 8-10 mm. long, the 

 outer ones deltoid to triangular-lanceolate, copiously pubescent, acute or acuminate at the 

 apex, cordate at the prominently auricled base, the 2 inner ones narrowdy linear; petals 

 yellow, about twice as long as the sepals, erose-uudulate at the apex ; androecium gla- 

 brous ; gynoecium pubescent ; capsules broadly oblong to ovoid-oblong, 8-10 mm. long ; 

 seeds 2-2.5 mm. long. 



Type locality : Turkey Creek to the prairies of San Felipe. 

 Distribution : Southern and western Texas and adjacent Mexico. 



2. Monoxalis robusta Rose, sp. now 



Stem and branches 30 cm. tall or more, woody, closely pubescent with short dark -gray 

 hairs ; leaflets mostly longer than the petioles, the blades oval, varying to slightly ovate or 

 obovate, 4-9 cm. long, abruptly short-tipped at the rounded apex, closely fine-pubescent on 

 both sides, but more copiously so beneath, cordate at the base ; cymes mostly 2-flowered ; 

 bracts setaceous, 4-8 mm. long ; sepals becoming 10-12 mm. long, the outer ones lanceolate, 

 slightly auricled at the base, the 2 inner ones linear ; petals yellow, scarcely twdce as long 

 as the sepals; androecium glabrous; gynoecium pubescent; capsules broadly oblong, 10-12 

 mm. long. 



Type collected in the Barranca de Santa Maria, near Zacupan, Vera Cruz, Mexico, November, 

 1906, C. A . I'nrpus 22S9. 



Distribution : Known only from the type locality. 



