53 
inches thick. Joints 4 lines in diameter; tubercles depressed, 7-9 
lines long; spines 8—10 lines long. Flower about 1-1} inches in 
diameter. 
*47. O. arsuscuta, E. 1. c.: arborescens, erecta, capitato-ramosis- 
sima ; articulis late viridibus elongato-subtuberculatis ; aculeis sub- 
singulis porrectis vel subdeflexis ; flore flavo-virescente. 
n the Lower Gila, near Maricopa village: fl. June. —A truly 
arborescent form, with a solid trunk of 4 or 5 inches in diameter, 7- 
8 feet high ; joints 2-3 inches long, about 4 lines in diameter ; tu- 
bercles indistinct, about 6 lines long; spine 9-12 lines long, often 
with 1 or 2 smaller ones under it. Flower 14 inches in diameter. 
48. O. vacinata, E. in Wisl. Rep. (partim): frutescens, erecta ; 
ramis erectiusculis; articulis subtuberculatis ; nneee subsingulis ; 
bacca obovata tuberculata coccinea. 
Albuquerque, New Mexico, and southward. — Shrub 3-5 feet 
high, 1-13 inches thick ; joints 3-4 lines in diameter ; tubercles 
rather distinct, 6-9 lines long. Fruit 8—9 lines long. Seed about 
2 lines in diameter. Perhaps a stout form of the next species. 
49. O. rruTEscENs, E. in PI. Lindh. 1845: frutescens, erecta; ra- 
mis erectiusculis ; articulis teretibus; aculeis subsingulis ; flore parvo 
virescente ; bacca obovata haud tuberculata coccinea. 
Var. a. LONGISPINA: articulis nascentibus stipitatis ; aculeis validi- 
oribus longioribus laxe vaginatis. 
Var. 8. BREVISPINA : articulis nascentibus sessilibus ; aculeis graci- 
lioribus brevioribus arcte vaginatis. 
From the Colorado of Texas to Matamoras and Saltillo, westward 
to Sonora and the Californian Colorado: fi. June to August. — Var. a. 
is the usual Western form; 8. occurs only in Texas and Eastern 
Mexico. — Shrub 3-5 feet high, stem 1-13 inches thick ; joints 2- 
3 lines in diameter ; indistinct tubercles 3-5 lines long ; spines in a. 
1-2 inches, in 8. 4-6 lines, long. Flower 7-9 lines in diameter. 
Fruit 5-9 lines long. Seeds few, usually 14 lines in diameter. 
. 50. O. resseLiata (O. ramosissima, E. in Sill. Journ. 1852) : fru- 
tescens, erecta seu diffusa, divaricato-ramosissima ; articulis gracili- 
bus tessellato-tuberculatis cesiis ; tuberculis 5~6_angulatis planis in- 
ermibus seu aculeum elongatum paucosque minutos gerentibus ; flore 
purpurascente parvg; bacca setosissima sicca. 
Valley of the Lower Colorado from Sonora to the California moun- 
