442 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Range: Rio Grande Valley about El Paso and southward, in the Lower Sonoran 

 Zone. 



This is probably to be found in southern New Mexico, although we have seen no 

 specimens. It is very common on the mesas about El Paso. 



6. Opuntia clavata Engelm. in Wisliz. Mem. North. Mex. 95. 1848. 



Type locality: About Albuquerque, New Mexico. Type collected by Wislizenus. 



Range: New Mexico. 



New Mexico: Santa Fe; El Rito; Las Vegas; Carrizozo; Stanley; Tesuque; Socorro; 



Albuquerque; Laguna; Los Lunas; Cubero. Dry plains, in the Upper Sonoran Zone. 



A common plant on the high mesas and plains of the central and northern parts of 



the State. It is rarely over 10 cm. high and forms irregular beds sometimes 1 or 2 



meters across. 



7. Opuntia whipplei Engelm. & Bigel. Proc. Amer. Acad. 3: 307. 1856. 

 Opuntia whipplei laevior Engelm. & Bigel. loc. cit. 



Type locality : ' ' From Zuiii westward to Williams River, ' ' Arizona or New Mexico. 



Range: Western New Mexico to Arizona. 



New Mexico: Gallup; Aztec; Puertecito; south of Ojo Caliente; Farmington; Cedar 

 Hill. Upper Sonoran Zone. 



This is a characteristic low, cylindric-stemmed plant, reaching a height of 60 cm. 

 in western New Mexico in the region about Zuni. It often forms dense beds 1 meter 

 or more in diameter. The New Mexican plant, so far as we know, is always of this 

 form and size, and has yellow flowers. Farther west, in Arizona, it becomes much 

 larger and often has purple flowers. 



The species is most like the next, Opuntia davisii, which is fairly common in the 

 eastern part of the State, on plains south and east of Portales. Both are low and very 

 spiny and have medium-sized yellow flowers and tuberculate fruit. Opuntia davisii 

 is stouter, with shorter joints and more numerous spines. The two are most easily 

 distinguished by the sheaths of the spines. Opuntia whipplei always looks whitish 

 or very pale yellow, while Opuntia davisii is a golden brown, these colors being due 

 to the sheaths. 



8. Opuntia davisii Engelm. & Bigel. Proc. Amer. Acad. 3: 305. 1856. 



Type locality: On the Llano Estacado, near the upper Canadian River, New 

 Mexico or Texas. 

 Range: Eastern New Mexico and western Texas. 

 New Mexico: Red Lake (Wooton). Sandy plains, in the Upper Sonoran Zone. 



9. Opuntia leptocaulis DC. M6m. Mus. Hist. Nat. 17: 118. 1829. 

 Type locality: Mexico. 



Range: Southern New Mexico and Arizona to western Texas, Bouth into Mexico. 



New Mexico: Mesa near Agricultural College; ten miles east of Hillsboro; Oro- 

 grande; Guadalupe Mountains; Kingston; Upper Corner Monument; Tularosa; Socorro; 

 Hachita. Lower Sonoran Zone. 



The slender-stemmed species of Opuntia of this type usually pass under the name 

 of "tasajilla" among the Mexicans, although this species is also called "garrambullo," 

 a name applied to almost any shrub with red berries. 



10. Opuntia kleiniae DC. Mem. Mus. Hist. Nat. 17: 118. 1829. 

 Opuntia wrightii Engelm. Proc. Amer. Acad. 3: 308. 1856. 

 Type locality: Mexico. 



Range: Western Texas and southern New Mexico to Mexico. 



New Mexico: Low hills west of San Antonio; mesa near Agricultural College. 

 Lower Sonoran Zone. 



The specimens here listed are referred to the above species tentatively and with 

 considerable doubt. They agree in most of their characters with the description of 

 Opuntia wrightii, but the flowers are a dull purple, more or less streaked with green. 



