150 SYNOPSIS OF THE CACTACEZ OF THE UNITED STATES. 
Sonora, on the Sierra Babuquibari, in fertile soil: flowers July and August. — Stems 5-6 feet high ; joints 
3-4 inches long, 14 inches in diameter; the swelling tubercles very prominent ; spines 3-9 lines long, sometimes 
almost wanting. Flowers an inch or less in diameter. 
45. O URBERI, E. in B. C. R.: frutescens, erecta; articulis cylindricis gracilibus elongato-tuberculatis ; 
aculeis 3-5 Sctbeak Sa ED flore miniato. 
Bacuachi, Sonora: flowers June.— Much more slender than any species yet enumerated in this subgenus. 
Joints half an inch in diameter ; tubercles 9 lines long; spines 3-8 lines long, a lowest one the stoutest. Flower 
14 inch in diameter. 
* * Monacanthe: lignum densum : articuli graciliores obscure Regi aculei singuli: flores flavi seu rubri: 
ina plus minus margina 
O. Wrieutu, E. 1. c.: frutescens, erecta; articulis pe gracilibus elongato-subtuberculatis; aculeis 
subsingulis porrectis vel subdeflexis ; flore miniato. 
On steep mountain-sides, from the Limpio to the Pecos, and in northern Mexico: flowers Jun 
July. — Shrub 2-4 feet high, 1-14 inches thick. Joints 4 lines in diameter ; tubercles depressed, “~. a [309] 
long ; spines 8-10 lines long. Flower about 1-1} inches in diameter. 
O. arBuscuna, E. 1. ¢.: arborescens, erecta, capitato-ramosissima ; articulis lete viridibus elongato- 
irda ; gi subsingulis porrectis vel abilettexia 1 flore flavo-virescente. 
n the lower Gila, near Maricopa village: flowers 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 ; tubercles indistinct, about 
6 lines long ; spine 9-12 lines long, often with 1 or 2 smaller ones under it. Flower 1} inches in diameter. 
48. O. vacinata, E. in Wisliz. Rep. (partim): frutescens, erecta ; ramis erectiusculis ; articulis subtubercu- 
latis ; aculeis subsingulis ; bacca obovata tuberculata coccinea. 
Albuquerque, New Mexico, and southward. — Shrub 3-5 feet high, 1-14 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. FRUTESCENS, E. in Plant. Lindh. 1845: frutescens, erecta; ramis erectiusculis ; articulis teretibus ; 
aculeis subsingulis ; flore parvo virescente ; bacca obovata haud fabibeetinn cocci 
ar. a. LONGISPINA : articulis amare stipitatis ; aculeis validioribus scree laxe vaginatis. 
ar. 8. BREVISPINA: articulis nascentibus sessilibus ; aculeis gracilioribus brevioribus arcte vaginatis. 
From the Colorado of Texas to Matamoras and —- esl to Sonora and the Californian Colorado : 
flowers June to August. — Var. a. is the usual western form; 8. occurs only in Texas and eastern Mexico. — Shrub 
3-5 feet high, stem 1-1} inches thick; joints 2-3 lines in oo indistinet tubercles 3-5 lines long; spines in a. 
1-2 inches, in B. 4-6 lines long. Flower 7-9 lines in diameter. Fruit 5-9 lines long. Seeds few, usually 14 lines in 
diameter. 
50. O. TESSELLATA, O. ramosissima, E. in Sillim. Journ. 1852: frutescens, erecta seu diffusa, divaricato- 
ramosissima ; articulis gracilibus tessellato-tuberculatis casiis; tuberculis 5-6 angulatis planis inermibus seu aculeum 
elongatum paucosque minutos gerentibus; flore purpurascente parva ; bacca setosissima sicca. 
Valley of the lower Colorado from Sonora to the California mountains: flowers May to September.— [310] 
Stems 2-6 feet high, at the base 1-3 inches thick ; joints 3-34 lines in diameter, ashy gray; the singular 
flattened and angular tubercles 2}-3 lines long; spines 13-2 inches long, crowded together at the upper end of each 
year’s growth, very loosely sheathed. Flower purple, half an inch in diameter. Fruit 9-10 lines long, covered with 
reddish-brown bristles, Seed 2 lines or less in diameter. 
*," The material for the present study of our Cactacee is not as full as would have been 
desirable in the examination of so difficult a family. Hence it may sometimes have happened that 
what I have endeavored to distinguish as species are forms which properly belong together; or I 
may have combined as one species incomplete specimens of quite distinct plants. The fear of con- 
fusing heterogeneous plants under one name, and the desire to indicate to future explorers all the 
different forns known to me, combined to induce me to proceed as I have done. 
