126 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



2. Commelina crispa Wooton, Bull. Torrey Club 25: 451. 1898. 

 Commelina virginica of many authors, not L. 



Type locality: At the base of the Organ Mountains, New Mexico. Type collected 

 by Wooton (no. 545). 



Range : Colorado and Missouri to New Mexico. 



New Mexico: Santa Rita; Dog Spring; Tortugas Mountain; Organ Mountains; 

 Jarilla Junction; Knowles; Nara Visa; Carrizozo; Orogrande. Dry plains and hills, in 

 the Lower Sonoran Zone. 



2. TRADE SCANTIA L. Spiderwort. 



Perennial herbs with simple or branched erect stems, narrow elongated leaves, 

 and showy flowers in terminal umbel-like cymes subtended by leaflike bracts; sepals 



3, distinct, herbaceous; petals 3, sessile, blue. 



KEY TO THE SPECIES. 



Plants small, 25 cm. high or less; sheaths strongly pubescent, 

 especially along the margins; roots tuberous, the tubers 



attached along a creeping rootstock ' 1. T. pinetorum. 



Plants larger, 30 to 60 cm. high; sheaths glabrous; roots somewhat 

 fleshy, fascicled. 

 Plants sparingly branched, green; sepals and pedicels densely 



glandular-pubescent 2. T. occidentals. 



Plants much branched, glaucous; sepals and pedicels sparingly 



glandular 3. T. scopulorum. 



1. Tradescantia pinetorum Greene, Erythea 1: 247. 1893. 

 Tradescantia tuberosa Greene, Bot. Gaz. 6: 185. 1881, not Roxb. 1798. 



Type locality: Pinos Altos Mountains, New Mexico. Type collected by E. L. 

 Greene. 



Range: New Mexico and Arizona. 



New Mexico: Mogollon Mountains; West Fork of the Gila; San Luis Mountains; 

 Tularosa Creek. Upper Sonoran and Transition zones. 



2. Tradescantia occidentalis Britton, Mem. N. Y. Bot. Gard. 1: 87. 1900. 

 Tradescantia virginica occidentalis Britton in Britt. & Brown, Illustr. Fl. 1: 377. 1896. 

 Type locality: "Wisconsin to Missouri, Texas, and New Mexico." 



R a \ge: As ab ove . 



New Mexico: Hills near Clayton {Bartlett 235, 252). Upper Sonoran Zone. 



3. Tradescantia scopulorum Rose, Contr. U. S. Nat. Herb. 5: 205. 1899. 

 Type locality: Santa Catalina Mountains, Arizona. 



Range: Western Nebraska and Montana to Arizona and western Texas. 

 New Mexico: Gallup; Zuni Reservation; Organ Mountains; East Canyon. Dry 

 hills, in the Upper Sonoran Zone. 



17. PONTEDERIACEAE. Pickerel-weed Family. 



1. HETEEANTHEEA Willd. Mud plantain. 



Succulent herb with branched stems, numerous oval or ovate long-petioled leaves, 

 and small white or blue flowers in 1-flowered spathes; lobes of the perianth linear; 

 stamens 3, equal; fruit an ovoid many-seeded capsule. 



1. Heteranthera limosa (.Swartz) Willd. Ges. Naturf. Freund. Berlin Mag. 3: 439. 

 1801. 



Pontederia limosa Swartz, Prodr. Veg. Ind. Occ. 57. 1788. 



Type locality: "Jam. Hispaniola." 



Range: Virginia to New Mexico, southward through Tropical America. 



New Mexico: Santa Rita; Middle Fork of the Gila. In mud or shallow water. 



