POLYPETALOUS EXOGENOUS PLANTS. 275 



on each of them 9-12 bristly spines 4"-9" long. Rio 

 Gmnde. — Engelmann. 



C. PAUCISPINUS. Stem 5-9' high, 2-4' in diameter, 

 not cagspitose, but either simple or with few branches from 

 near the base; ribs few, grooves wide and shallow; arcolm 

 8"-10" apart; spines few and dark-colored, 9"-15" long, 

 upper one often shorter, and central spine when present 

 15"-20" long; floiver not described. — Engelmann. 



C. Berlandieri. a spreading procumbent plant, with 

 erect hranches contracted at the base, and thereby articu- 

 lated, 1\'-Q' long, f-'-l' thick, either terete with distinct 

 spirally-disposed tubercles, or the tubercles arranged in 5 

 or 6 ribs; areolce 4"-6" apart; radial S2nnes bristle-like 

 (weaker than C. procumbens), 4"-5" long, sometimes a 

 stouter and darker one at the upper end of the areolae; 

 central spine yellowish brown, shorter on the lower part of 

 each branch, longer toward the top, from 5"-6" to 10"-13" 

 in length ; flower 3 '-4' long, or when fully open spreading 

 'almost 4', and only 2' in height ; bristles of the tube below 

 2"-3", upward 4"-6" long, the tomentum white and short; 

 petals long and narrow, 3"-4" or rarely 5" wide, bright 

 rose-purple; filaments short, pale rose-colored; stigmata 

 long and sub-erect ; bejTi/ 9' long, densely covered with the 

 elongated mottled hairlike spines. Named for Dr. J. L. 

 Berlandier, who found it on the lower Rio Grande. Na- 

 tive of Southern Texas. — Emory^s Reports. 



C. PROCUMBENS. Similar to the last, but more slender; 

 hranclies |-'-3'-4' in length, 6"-8" in diameter; tubercles 

 4"-5" apart, in 4 rows when the branches appear quadran- 

 gular, or in 5 rows when they are more terete; radial 

 spines l"-2" long, central one or lower part of joint want- 

 ing, or hardly longer than the radial ones, on the upper 

 part 2"-4" wide;/n«iY 6"-8" long; seed compressed.— 

 Engelmann. 



C. TUBEROSUS. Stem l°-2° high, lower part ligneous. 



