OXALIDACEAE 665 



Leaflets pinnate: ovary and capsule drooping, depressed at the apex; 



stigmas 2-cleft. 5. Lotoxalis. 



Leaflets palmate: ovary and capsule erect, narrowed at the apex: stigmas 



capitate. 6. Xanthoxalis. 



1. OXALIS L. 



Spreading herbs. Leaf-blades palmately 3-foliolate, each usually with a mem- 

 branous fold in the apical sinus. Flowers commonly solitary. Sepals not tubereulate 

 at the apex. Filaments commonly glabrous. Wood-sorrel. 



1. Oxalis Acetos^lla L. Eootstoek scaly at the end: blades of the leaflets 



obcordate, 10-15 mm. long: scapes 5-15 cm. long: sepals oblong to lanceolate: 



petals white or pink and delicately veined, 1-1.5 cm. long: capsules ovoid-globose, 2-4 



mm. long. 



In damp woods, Nova Scotia to Manitoba, and South Carolina. Also in Europe and 

 Asia. Spring and summer. 



2. BOLBOXALIS Small. 

 Erect herbs with rootstocks which bear bulblets at their nodes. Leaf-blades 

 palmately 3-foliolate: leaflets sessile with broadly obcordate or somewhat obreniform 

 blades. Flowers borne in umbel-like cymes. Sepals 5, each bearing a pair of apical 

 tubercles. Petals yellow, typically large and conspicuous. 



1. Bolboxalis c^mua (Thunb.) Small. Plants 1-4 dm. tall, bright-green: 

 blades of the leaflets 2-3.5 cm. broad, very broadly obcordate, glabrous or sometimes 

 pubescent beneath: peduncles surpassing the leaves: 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: capsules 5-8 mm. long. 



In sandy soil, Florida. Native of southern Africa. 



3. lONOXALIS Small. 



Erect herbs. Leaf -blades palmately 3-10-foliolate; leaflets with tubercles in the 

 apical sinus. Flowers usually borne in umbel-lLke cymes. Sepals tubercled at the 

 apex. Petals violet, blue, red or white. Violet Wood-sorrel. 



Inflorescence simple. 



Capsules globose-ovoid; blades of the leaflets obreniform. 1. I. violacea. 



Capsules broadly oblong; blades of the leaflets crescentic or lunate, some- 

 times broadly so. 2. I. Drummondii. 

 Inflorescence compound. 3. /. Mariiana. 



1. lonoxalis violacea (L.) Small. Plants 5-35 cm. tall: blades of the leaflets 



6-16 mm. long: scapes glabrous: sepals oblong to ovate-oblong: petals rose-purple or 



white: capsules 4-5 mm. long. 



In woods and on open slopes, Maine to the Rocky Mountain region, Florida and New 

 Mexico. Spring to fall. 



2. lonoxalis Drummondii (A. Gray) Eose. Plants slender, 5-25 cm. tall: 

 blades of the leaflets with narrow lobes: scapes glabrous: sepals narrowly oblong to 

 oblong-lanceolate : petals violet : capsules 8-10 mm. long. [Oxalis vespertilionis T. & G.] 



In open sandy or stony soil, Texas to Arizona. Summer and fall. 



3. lonoxalis Martiina (Zucc.) Small. Plants stout, 8-30 cm. tall: blades of 

 the leaflets longer than those of I. violacea: scapes pubescent: sepals oblong to 

 narrowly oblong: petals rose-purple often pale. 



In waste places, South Carolina to the Gulf States. Naturalized from tropical America. 

 All year. 



4. MONOXALIS Small. 



Herbs. Leaf -blades 1-foliolate: leaflets thickish. Flowers solitary on each 



peduncle. Sepals 5, auricled at the base. Filaments glabrous. Capsule short, erect. 



1. Monoxalis dlchondraefolia (A. Gray) Small. Plants closely pubescent, 1-3 

 dm. tall: blades of the leaflets suborbicular, inclined to obovate, oblong or ovate, 



