53 3 
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. arbuscula, E. 1. c.: arborescens, erecta, capitato-ramosis- 
sima; articulis leete viridibus elongato-subtuberculatis; aculeis sub- 
singulis porrectis vel subdeflexis ; flore flavo-virescente. 
On 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 \\ inches in diameter. 
48. O. VAGiNATA, E. in Wisl. Rep. (partim): frutescens, erecta; 
ramis erectiusculis ; articulis subtuberculatis ; aculeis subsingulis; 
bacca obovata tuberculata coccinea. 
Albuquerque, New Mexico, and southward. — Shrub 3-5 feet 
high, 1 -1inches 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. frutescens, E. in PI. Lindh. 1845: frutescens, erecta; ra¬ 
mis erectiusculis ; articulis teretibus; aculeis subsingulis ; flore parvo 
virescente; bacca obovata haud tuberculata coccinea. 
Yar. a. longi spina : articulis nascentibus stipitatis ; aculeis validi- 
oribus longioribus laxe vaginatis. 
Var. /3. brevispina : articulis nascentibus sessilibus ; aculeis graci- 
lioribus brevioribus arete vaginatis. 
From the Colorado of Texas to Matamoras and Saltillo, westward 
to Sonora and the Californian Colorado : fl. June to August. —Var. a. 
is the usual Western form; occurs only in Texas and Eastern 
Mexico. — Shrub 3-5 feet high, stem 1-1^ inches thick ; joints 2- 
3 lines in diameter ; indistinct tubercles 3 - 5 lines long ; spines in a. 
1-2 inches, in /3. 4-6 lines, long. Flower 7-9 lines in diameter. 
Fruit 5-9 lines long. Seeds few, usually 1| lines in diameter. 
•50. O. tessellata (O. ramosissima, E. in Sill. Journ . 1852): fru¬ 
tescens, erecta seu diffusa, divaricato-ramosissima; articulis gracili- 
bus tessellato-tuberculatis csesiis ; tuberculis 5-6 angulatis planis in- 
ermibus seu aculeum elongatum paucosque minutos gerentibus ; flore 
purpurascente parva ; bacca setosissima sicca. 
Valley of the Lower Colorado from Sonora to the California moun- 
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