Children (53 direct children, 54 direct and indirect children):
Humboldtiana edithae
Humboldtiana fullingtoni
Humboldtiana palmeri
Humboldtiana hoegiana
(tree size 1)
Humboldtiana agavophila
Humboldtiana chisosensis
Humboldtiana ferrissiana
Humboldtiana texana
Humboldtiana cheatumi
Humboldtiana ultima
Humboldtiana nuevoleonis
Humboldtiana balanites
Humboldtiana bicincta
Humboldtiana buffoniana
Humboldtiana cicatricosa
Humboldtiana corruga
Humboldtiana chrysogona
Humboldtiana edesma
Humboldtiana eulaliae
Humboldtiana fortis
Humboldtiana gradyi
Humboldtiana humboldtiana
Humboldtiana inferior
Humboldtiana iversoni
Humboldtiana latizona
Humboldtiana malenae
Humboldtiana montezuma
Humboldtiana oberon
Humboldtiana ootamorum
Humboldtiana oreina
Humboldtiana pergranulosa
Humboldtiana pinicola
Humboldtiana porterae
Humboldtiana princeps
Humboldtiana queretaroana
Humboldtiana regula
Humboldtiana riskindi
Humboldtiana spectabile
Humboldtiana sylvania
Humboldtiana tanymastix
Humboldtiana tescola
Humboldtiana titania
Humboldtiana fasciata
Humboldtiana globosa
Humboldtiana hogeana
Humboldtiana pilsbryi
Humboldtiana plana
Humboldtiana potosiana
Humboldtiana striata
Humboldtiana taylori
Humboldtiana torrei
Humboldtiana aurea
Humboldtiana praesidii