444 CONTEIBUTIONS FROM THE NATIONAL HEEBAEIUM. 



15. Opuntia trichophora (Engelm.) Britt. & Rose, Smiths. Misc. Coll. 50: 535. 1908. 

 Opuntia missouriensis trichophora Engelm. Proc. Amer. Acad. 3: 300. 1856. 



Type locality: Mountains near Albuquerque, New Mexico. Type collected by 

 Bigelow. 



Range: Central New Mexico. 



New Mexico: Arroyo Hondo; Mesa Redonda twelve miles south of Tucumcari; 

 south edge of San Augustine Plains; sandhills near the Chincherita Mountains. Upper 

 Sonoran Zone. 



The species is similar to Opuntia polyacanlha. The slender, hairlike lower spines 

 give it its specific name and are the distinguishing character. The condition is more 

 noticeable in dried than in growing specimens. 



16. Opuntia polyacantha Haw. Syn. PI. Succ. Suppl. 82. 1819. 

 Cactus ferox Nutt. Gen. PI. 1: 296. 1818, not Willd. 1813. 

 Opuntia missouriensis DC. Prodr. 3: 472. 1828. 



Type locality: "In arid situations on the plains of the Missouri." 



Range: From near the northern boundary of the United States to western Texas 

 and eastern New Mexico. 



New Mexico: Laguna; near Fort Defiance; near Albuquerque; 20 miles north 

 of Gallup; south of Tierra Amarilla; west of Magdalena; west of Tiznitzin; AiToyo 

 Hondo; Farmington; Raton. Plains and sometimes in the mountains, Upper Sonoran 

 Zone. 



A variable and widely distributed species. 



The subspecies albispina Engelm. & Bigel., from the "sandy bottoms and dry 

 beds of streamlets on the upper Canadian, 250 miles east of the Pecos" and "on the 

 Sandia Mountains near Albuquerque," is the form most common in New Mexico. 

 It is scarcely to be distinguished from subspecies rufispina, collected in "rocky 

 places on the Pecos," (probably in the region of Santa Rosa or Anton Chico), which 

 ifl the type form. The color variations in the spines indicated by the names are 

 hardly constant. 



17. Opuntia chlorotica Engelm. & Bigel. Proc. Amer. Acad. 3: 291. 1856. 



Type locality: "Western Colorado country, between New Mexico and California 

 from the San Francisco Mountains to Mojave Creek." 



Range: Southern New Mexico, Arizona, and California and adjacent Mexico. 



New Mexico: Hatchet Mountains; Dona Ana Moim tains; Steins Pass; Lake Valley; 

 Red Rock. Lower Sonoran Zone. 



This is the one Opuntia we have so far failed to transplant successfully, and we 

 have tried several times. It is very rare, occurring only in the southwestern part 

 of the State. The appressed, short, clear yellow spines are very characteristic, as is 

 the short trunk which is usually present. 



18. Opuntia macrocentra Engelm. Proc. Amer. Acad. 3: 292. 1856. 



Type locality: Sandhills on the Rio Grande, near El Paso, Texas or Chihuahua. 



Range : Western Texas, southern New Mexico, Arizona, and adjacent Mexico. 



New Mexico: Mesa near Las Cruces; Garfield; Deming; Mangas Springs; Steins 

 Pass; Lordsburg; White Water; Dog Spring. Sandy plains and hills, in the Lower 

 Sonoran Zone. 



This is probably Opuntia violacea Engelm. of Emory's Reconnaissance, although 

 the drawing does not closely resemble the plant nor is there any means of deter- 

 mining what the artist had to make his picture from. The only reason for believing 

 that this name might apply is that Opuntia macrocentra is the common red-jointed 

 Platyopuntia with long spines in the region mentioned and is "suberect." 



It seems useless in most cases to try to attach the names proposed by Doctor Engel- 

 mann in this report to any species, because he himself did not try to use them, although 



