OXALIDACEAE. 173 



2. CATHAKTOLINTJM Keichenb. Herbs. Leaves alternate or occasion- 

 ally opposite, sometimes with stipular glands. Sepals 5, the inner ones at least 

 with gland-tipped teeth. Petals yellow, sometimes pubescent within near the 

 base. Androecium of 5 stamens, generally without staminodia. Styles 5, dis- 

 tinct or united. Capsule 5-celled, or completely or incompletely 10-celled by 

 false partitions. Sum. YELLOW-FLAX. 



Calyx as long as the capsule or shorter ; sepals entire at maturity, the inner ones 



sometimes erose on account of the deciduous glandular hairs. 

 Outer sepals 2-2.5 mm. long at maturity : stem paniculately branched. 



1. G. striatum. 

 Outer sepals 3-3.5 mm. long at maturity : stem corymbosely 



branched. 2. G. virginianum. 



Calyx exceeding the capsule ; inner sepals strongly toothed. 3. (7. medium. 



1. C. striatum (Walt.) Small. Stems 2-8 dm. tall, paniculate, winged below 

 the nodes : leaves mainly opposite ; blades oblong or elliptic, 1-3 cm. long : outer 

 sepals lanceolate to oblong-lanceolate, 22.5 mm. long; inner sepals ovate to 

 suborbicular : capsules depressed-globose, 2 mm. broad. M. S. Not common, 

 in low grounds and swamps. Limestones, schists. 



2. C. virginianum (L.) Small. Stems 2-6 dm. tall, corymbose above, the 

 branches long: leaves mainly alternate, spreading; blades thinnish, spatulate 

 or oblanceolate to elliptic, 1-3 cm. long: outer sepals lanceolate to oblong- 

 lanceolate, 3-3.5 mm. long; inner sepals rather broader than the outer: cap- 

 sules depressed, 2 mm. broad. Common, on roadsides and in thickets. 



3. C. medium (Planch.) Small. Stems 3-6 dm. tall, corymbose above, the 

 branches rigid: leaves mainly alternate, erect or appressed; blades spatulate 

 to linear-elliptic or linear-lanceolate, 0.6-2 cm. long: outer sepals oblong to 

 lanceolate, 2-4 mm. long : capsules depressed-globose, 2-3 mm. broad. S. 

 Not common, on hillsides and roadsides, and in thickets. Schists, serpentine. 



FAMILY 3. OXALIDACEAE. WOOD-SORREL FAMILY. 



Herbs or rarely shrubs, the sap sour. Leaves mostly alternate: 

 blades 3-foliolate or 1-foliolate, the leaflets commonly notched at the apex. 

 Flowers perfect, essentially regular, cymose. Calyx of 5 persistent sepals. 

 Corolla of 5 white or colored petals. Androecium of 10-15 unequal 

 stamens: filaments united at the base. Gynoecium of 5 partially united 

 carpels : styles distinct. Fruit a loculicidal capsule, rarely baccate. 



Plants acaulescent, with coated bulbs : sepals tubercled at the apex. 



1. lONOXALIS. 



Plants caulescent, with fibrous roots or elongate rootstocks : 



sepals without apical tubercles. 2. XANTHOXALIS. 



1. IONOXALIS Small. Erect herbs. Leaf-blades palmately 3-10-folio- 

 late: leaflets with tubercles in the apical sinus. Flowers usually borne in 

 umbel-like cymes. Sepals tubercled at the apex. Petals violet, blue, red, or 

 white. 



1. I. violacea (L.) Small. Plants 5-35 cm. tall: leaflets 3; blades 6-16 mm. 

 long: scapes glabrous: sepals oblong to ovate-oblong: petals rose-purple or 

 rarely white : capsules 45 mm. long. Common, in woods and on shaded 

 banks. Spr. VIOLET WOOD-SORREL. 



2. XANTHOXALIS Small. Herbs. Leaf -blades palmately 3-foliolate: 

 leaflets not tubercled at the apical sinus. Flowers in umbel-like or dichotomous 

 cymes. Sepals 5, the inner narrower than the outer ones. Filaments glabrous 



