Anhalonium elongatum Salm-Dyck (1850).
This seems to be a third grooveless Mexican species. I have seen
no specimens, but judge from the description that it differs from
the two preceding species chiefly in its less crowded and more
elongated tubercles (triangular portion 5 cm. long by 2.5 cm.
broad at base), which are covered at apex with a tomentose
pulvillus.