WOOTON AND STANDLEY FLORA OF NEW MEXICO. 223 



1. Tripterocalyx micranthus (Torr.) Hook. Journ. Bot. Kew Misc. 6: 261. L853. 



Abronia micranlha Torr. in Frem. Rep. Exped. Rocky Mount. 96. 1845. 

 Type locality: "Near the mouth of Sweet Water river." 

 Range: Montana and Nebraska to Nevada and New Mexico. 



New Mexico: Albuquerque; opposite San Juan. Plains and low hills, in the 

 Upper Sonoran Zone. 



2. Tripterocalyx cyclopterus (A. Gray) Standley, Contr. U. S. Nat. Herb. 12: 



329. 1909. 

 Abronia cycloptera A. Gray, Amer. Journ. Sci. II. 15: 319. 1853. 

 Abronia carnea Greene, Pittonia 3: 343. 1898. 

 Type locality: On the Rio Grande, New Mexico. 

 Range: Western Texas and southern New Mexico to Chihuahua. 

 New Mexico: Near Albuquerque; Pecos River; Chavez; Rincon; Denting; Mesilla 

 Valley. Sandy fields and mesas, in the Lower Sonoran Zone. 

 The type of A. carnea was collected near Las Cruces {Wooton 59). 



3. Tripterocalyx wootoni Standley, Contr. U. S. Nat. Herb. 12: 329. 1909. 

 Type locality: Near Ojo Caliente, Zuni Reservation, New Mexico. Type col- 

 lected by Wooton, July 20, 1906. 



Range: Northwestern New Mexico and northeastern Arizona. 

 New Mexico: Western parts of Valencia, McKinley, and San Juan counties. Dry 

 plains and foothills, in the Upper Sonoran Zone. 



7. ABRONIA Juss. Sand verbena. 



Annual or perennial herbs with erect or prostrate, glabrous or pubescent stems; 

 leaves opposite, petiolate; flowers in a head surrounded by numerous or few distinct 

 thin bracts; perianth white or red, with an elongated tube and a rather narrow 5-lobed 

 limb; stamens 3 to 5, included; fruit leathery, with 3 to 5 wings or sometimes merely 

 lobed and not winged. 



KEY TO THE SPECIES. 



Plants nearly acaulescent, with a short thick, caudex; leaves nar- 

 rowly oblong or linear; perennial 1. A. bigclovii. 



Plants with long stems with conspicuous internodes; leaves 

 broader; perennials or annuals. 

 Perennials; bracts ovate or oblong; stems erect or spreading, 

 never prostrate; perianth white. 



Fruit biturbinate, tapering at both ends l'. .1 fragra 



Fruit turbinate, not tapering abo\e. 



Stems densely viscid-hirsute; bracts 10 to 15 mm. 



long 3. . 1 ../- ndleri. 



Stems only puberulent or almost glabrous; bra 



mm. long or less 4. . I . ramoaa. 



Annuals; brads lanceolate; steins prostrate: perianth purplish 

 red. 

 Leaves mostly ovate, rounded or broadly cuneate at the 



base; seeds lanceolate, 2 to 2.5 nun. long 5. I . torreyi. 



Leaves narrowly lanceolate, narrowed at th< i'ds 



ovate, 1.5 mm. long <<■ .1 . tmguttifoUa. 



1. Abronia bigelovii Beimerl, Smiths. Misc. Coll 53: 197. L908 

 Ttpb i<" ojty: Near Galisteo, New Mexico. Type collected by Bigelow. 



R \'..,i Known only from type locality, m the I pi"' r BonoraD Zone. 



