(39991) Iochroma = 1998 HR37
Named for a genus of shrubs and small trees found in the forests of
South America. Their hummingbird-pollinated flowers are tubular or
trumpet-shaped. Iochromas are often cultivated as flowering ornamentals.
A complete set of naming citations of the numbered minor planets is available in the Dictionary of Minor Planet Names, edited by Lutz Schmadel.