49 ' J&j - 
Saltillo, Mexico. — Spreading masses with joints an inch long or 
less; tubercles 4-6 lines long ; interior Spines 4-6, exterior ones 
1J - 3 lines long. Apparently near the South American O. pusilla , 
Salm., and perhaps belonging to the Opuntice glomerata , rather than 
here. Fruit unknown. 
§ 2. Cylindricce : adscendentes vel erectse: articuli longiores, ovato- 
cylindrici seu elongati: textura lignosa compacta, tubum reticula- 
tum vel truncum compactum formans : flores magni seu parvi, pur- 
purei vel raro flavi: bacca sicca vel subcarnosa, floris rudimenta 
plerumque dejiciens, aculeata seu inermis. 
* Polyacanthce: lignum plerumque reticulato-tubulosum; articuli 
Crassiores distincte tuberculati: aculei plures seu plurimi: flores 
plerumque rubri: semina immarginata. 
t Humiliores : diffuse ramosse : articuli subclavati: flores plerumque 
flavidi: baccse siccse, aculeatse. 
35. O. Davisii, E. & B. in P. R. Rep. : caule dense lignoso ramo- 
sissimo divaricato; articulis junioribus erectis elongatis basi attenuatis; 
tuberculis oblongo-linearibus; aculeis interioribus 4-7 subtriangu- 
laribus rufis vagina straminea laxa indusiatis divergentibus; aculeis 
inferioribus 5-6 gracilibus; bacca ovata pulvillis sub-25 aculeigeris 
stipata. 
On the Llano Estacado, near the Upper Canadian River ; common. 
— Spreading and somewhat procumbent, about 18 inches high ; the 
only one in this section with dense wood. Joints 4-6 inches long, 
rather slender; tubercles 7-8 lines long; interior spines 1 - 1 inch¬ 
es in length; lower ones 3-6 lines long. Fruits (all sterile, and per¬ 
haps not properly developed) an inch or more in length. 
36. O. echinocarpa, E. & B. 1. c. : erectiuscula; ramis numero- 
sis patentissimis ; articulis ovatis basi clavatis ; tuberculis ovatis con- 
fertis ; aculeis majoribus sub-4 albidis stramineo-vaginatis, 8-16 mi- 
noribus undique radiantibus ; flore flavo (?); bacca globosa depressa 
seu hemispheerica late profundeque umbilicata pulvillis sub-40 aculea- 
tissimis stipata; seminibus late commissuratis. 
Yar. /3. major : elatior; articulis elongatis; aculeis longioribus 
laxius vaginatis paucioribus; baccis globosis pulvillos pauciores (25) 
gerentibus. 
In the valley of the Lower Colorado; /3. in Sonora. — Var. a. is a 
7 
