59 



Opuntia bulbispina, E. 



"Radicibes fusiformibus ; articulis parvis ovatis sa?pe ex apice pro- 

 liferis fragilibus; tuberculis ovatis brevibus; pulvillis parce setoris; aculeis 

 teretiusculis scabrellis basi bulbosis, interioribus 4 cruciatis, inferiore lon- 

 giore, exterioribus 8-12 radiantibus. Saltillo, Mexico. Spreading masses 

 with joints an inch long or less; tubercles 4-6 lines long; inteiior spines 4- 

 6, exterior ones 1.^-3 lines long. Apparently near the South American O. 

 pusilla, Salm, and perhaps belonging to the Opuntias glorneratse rather 

 than here [Clavatae]. Fruit unknown." — E. Syn 304. 



Opuntia arenaria E. 



"Adscendens ; articulis obovatis compressis seu teretiusculis tuber- 

 culatis; foliis minutis ; pulvillis subconfertis pallide setosis; aculeis 1-4 ro- 

 bustioribus albidis fascatisve, cum inferioribus brevioribus 2-6 albis; floris 

 sulphurei ovario ohovato; petalis emarginatis; stigmatibus 5; bacca oblon- 

 ga spinulosa; umbilico infundibuliformi; seminibus magnis irregularibus. 

 Sandy bottoms of the Rio Grande near El Paso; flowers Ma} T . Spreading 

 2-3 ft., y 2 -\ ft. high; roots stout, creeping horizon tally ; joints 1^-3 inches 

 long, 1-2 inches wide, and Yi-% thick, more strongly tuberculated than 

 the allied species; leaves only a line long; pulvilli 3-5 lines apart, very 

 bristly, especially on the old joints; upper spines 9-15 lines long. Flower 

 2.-2]^ inches in diameter. Fruit about an inch long. Seeds 2*4-3 lines in 

 diameter. This is the only one of our Cactaceae on which the Cochenille 

 has been found." — E, Syn 301 (45). 

 Opuntia chi^orotica E-B. 



"Caule erecto aculeis flavis numerosissimis fasciculatis armato; ar- 

 ticulis orbiculato-obovatis pallidis ; pulvillis subremotis setas difformes 

 confertas aculeosque 3-6 inaequales compressos straminecs gerentibus; 

 floris flavi ovario pulvillis confertis stipato; petalis spathulatis. Western 

 Colorado country, between New Mexico and California, from the San 

 Francisco mountains to Mojave creek. Plant 4-6 feet high, forming large 

 and sometimes spreading bushes; the trunk covered with spines 1-2 inch- 

 es long; joints S-10 by 6-8 inches in length; spines y 2 -i l A inches long. 

 Ovary with nearly 50 pulvilli, while the foregoing species [Engelmanni, 

 etc.] have not more than 20." — E, Syn 291. 

 Opuntia macrorhiza E. 



"Prostrata; articulis obovato-orbiculatis planiusculis; pulvillis setis 

 fuscis et ssepe aculeis singulis binisve instructis; aculeis teretibus 

 validis porrectis s. paulo deflexis basi apiceque fuscis ceterum albidis 

 cum adventitio inferiore graciliore reflexo sagpe deficiente; floribus 

 sulphureis basi intus rubellis; ovario sepalis subulatis deciduis 13 in 

 axillis setulas fuscas brevissimas gerentibus stipato; sepalis interi- 

 oribus 15-8 subulatis et (internis) ovatis acuminato-cuspidatis; petalis 

 8 stpala superantibus late obovato-spathulatis obtusis cuspidatis eroso- 

 denticulatis ; stigmatibus 5 obtusis, adpressis, stamina numerosa sequan- 

 itibus; bacca subpulposa clavata glabrata; seminibus marginatis. — 



