[1] Common names include amole de río, longflower tuberose, and Runyon's huaco.

[3] The type specimens were sent by botanist and photographer Robert Runyon (1881–1968) to the New York Botanical Garden in 1921.

Consequently, the species was initially placed in a monotypic genus named in his honour, Runyonia, by Joseph Nelson Rose.

A. longiflora is a rhizomatous perennial with 3–7 prostrate leaves in a basal rosette.

[5] It inhabits hills, terraces and slopes in the semi-arid Tamaulipan mezquital.