Wiktionary
columnal
a. columnar n. A disklike part of the stem of a crinoid
Usage examples of "columnal".
Stephen mounted: out of the grove there was more wind now, more wind by far, right in their faces, and the road climbed, winding and for ever rising with tall, very tall, many branched columnal cactuses on either hand and little else apart from smaller cactuses with even crueller thorns.
The great, fluted saguaros, fifty, sixty feet high, raised columnal forms, and their branching limbs and curving lines added a grace to the desert.