204 PlantcB Lindheimeriance. 



albo-tomentosis ; aculeis brevibus tenuibus albidis apice fus- 

 cis, 5-6 radiantibus, centrali singulo erecto paulo longiore ; 

 floribus diurnis ; ovario tuboque brevi pulvillis sub-40 albido- 

 villosis setas spinescentes breviores fuscas 6-9 gerentibus 

 stipato ; sepalis interioribus sub-15 lineari-lanceolatis acumina- 

 tis ; petalis 18-20 oblongo-linearibus acutis mucronatis sub- 

 integris (violaceis) ; stigmate viridi infundibuliformi 10-par- 

 tito stamina (pallide flavicantia) paulo superante. — On the 

 lower Rio Grande, below Matamoras, collected by the St. Louis 

 Volunteers, in 1846. — Plant spreading, 3-5 inches high: 

 joints or branches l|-2 inches long, \ inch in diameter, much 

 contracted at the base : tubercles 4 or 5 lines distant from one 

 another, often in 4 rows, whence the plant derives a distinctly 

 quadrangular appearance, or in 5, when it is more cylindrical. 

 Radial spines 6, or mostly only 5, the uppermost being fre- 

 quently abortive, 1 - 1| lines long; central spine l|-2 § lines 

 as long, stouter, directed upwards. Flower 3 inches long, and 

 as wide when fully expanded, of a delicate purple color : petals 

 4 lines wide, often, in a bright noonday sunshine, recurved. 

 Bristles on the tube about twice as long as the wool, below 

 l§-2, above 2^-3, lines long. — We have in gardens in St. 

 Louis a similar species in cultivation, under the name of C. 

 Deppii; but, as Prince Salm informs me, widely different from 

 the true C. Deppii. It is not known whence it was obtained. 

 It is distinguished from C. procumbens by the larger, thicker, 

 more cylindric limbs: tubercles elevated, very distinct, in 5 or 

 6 rows ; spines weaker and longer; 6-8 radial spines 5-6 

 lines long; ventral spine from 5 to 14 lines long: flower with 

 a shorter tube, fewer pulvilli, with shorter wool, but longer 

 and weaker bristles. 



Cereus Rcemeri (n. sp.) : ovatus, e basi ramosus ; costis 

 sub-8 (7-9) tuberculatis interrupts; areolis orbiculatis, 

 junioribus breviter tomentosis; aculeis albidis s. flavidulis 

 demum cinereis teretibus, radialibus sub-8, centrali singulo 

 robustiori porrecto ; floribus diu noctuque apertis infundi- 

 buliformibus, limbo erectiusculo ; sepalis ovarii et tubi 17 



