384 CONTRIBUTIONS FROM THE NATIONAL HEKBAEIUM. 



of 5 herbaceous sepals; petals rose or yellow; stamens 10, the filaments united at the 

 base; pistil of 5 united carpels; fruit a capsule, the seeds transversely wrinkled. 



KEY TO THE GENERA. 



Plants acaulescent, with tuberous roots; flowers rose to 



almost violet 1. Ionoxalis (p. 384). 



Plants caulescent, rliizomatous, sometimes with tubers; 



flowers yellow 2. Xanthoxalis (p. 385). 



1. IONOXALIS Small. Violet wood-sorrel. 



Perennial acaulescent herbs with leaves and scapes rising from scaly bulbs; petioles 

 elongated; leaf blades palmately 3 to several-foliolate, the leaflets narrowly to broadly 

 obcordate, with cuneate bases; flowers in bracted cymose clusters terminating long 

 slender Aveak scapelike peduncles, usually not very numerous; sepals 5, each with 

 apical tubercles; stamens 10, the filaments united at the base; caj^sules erect. 



KEY to the species. 



Leaves with 4 to several leaflets. 



Leaflets as broad as long or broader; plants 8 cm. high or less 1.7. caerulea. 



Leaflets much longer than broad; plants more than 8 cm. high. . 2. /. grayi. 

 Leaflets 3. 



Filaments appendaged on the back. 



Longer filaments pubescent, the shorter ones glabrous; 



leaflets shallowly notched 3. /. metcalfei. 



All filaments pubescent; leaflets deeply notched 4. /. amplifolia. 



Filaments not appendaged. 



Tubercles of the sepals distinct 5. I. monticola. 



Tubercles confluent at the tips 6. I. violacea. 



1. Ionoxalis caerulea Small, N. Amer. Fl. 25: 33. 1907. 



Type locality: Lincoln County, New Mexico. Type collected by Miss Josephine 

 Skehan (no. 112). 

 PvAnge: Known only from the type locality, in the Transition Zone. 



2. Ionoxalis grayi Rose, Contr. U. S. Nat. Herb. 10: 112. 1906. 

 Oxalis decapetala H. B. K. err. det. A. Gray, PI. Wright. 2: 25. 1853. 



Type locality: Copper Mines, New Mexico. Type collected by Wright in 1851. 

 Range: New Mexico and northern Mexico. 



New Mexico: West Fork of the Gila; James Canyon. Damp woods and canyons, 

 in the Transition Zone. 



3. lonoxaHs metcalfei Small, N. Amer. Fl. 25: 39. 1907. 



Type locality: Mogollou Mountains, Socorro County, New Mexico. Type col- 

 lected by Metcalfe (no. 299). 



Range: Southwestern New Mexico. 



New Mexico: Mogollou Creek; Burro Mountains. Transition Zone. 



4. lonoxaHs ampUfolia (Trel.) Rose, Contr. U. S. Nat. Herb. 10: 110. 1906. 

 Oxalis latifoUa H. B. K. err. det. Trel. Mem. Bost. Soc. Nat. Hist. 4: 91. -pi. 11. 



f. 12. 1888. 

 Oxalis divergens ampUfolia Trel. in A. Gray, Syn. Fl. 1': 368. 1897. 

 Type locality: Arizona. 

 Range: Western Texas to Arizona. 



