444 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
15. Opuntia trichophora (Engelm.) Britt. & Rose, Smiths. Misc. Coll. 50: 535. 1908. 
Opuntia missouriensis trichophora Engelm. Proc. Amer. Acad. 8: 300. 1856. 
Tyre 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 polyacantha. 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. Pl. Succ. Suppl. 82. 1819. 
Cactus ferox Nutt. Gen. Pl. 1: 296. 1818, not Willd. 1813. 
Opuntia missouriensis DC. Prodr. 3: 472. 1828. 
Type Locaity: ‘‘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; Arroyo 
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 
is 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 Locauity: ‘‘Western Colorado country, between New Mexico and California 
from the San Francisco Mountains to Mojave Creek.” 
Rance: Southern New Mexico, Arizona, and California and adjacent Mexico. 
New Mexico: Hatchet Mountains; Dona Ana Mountains; 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 Loca.ity: Sandhills on the Rio Grande, near El Paso, Texas or Chihuahua. 
Rance: 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 
