Phedimus ellacombeanus (Praeger) 't Hart was first described by
Praeger (1917), as
"Sedum Ellacombianum, sp. nov." (p. 41), then on the subsequent page saying that it was "Named in memory of Canon H. N. Ellacombe, keenest of gardeners and kindest of friends" (etc). As such, the suffix -ānum (in the neuter) on the species epithet was added to a noun stem to form an adjective, hence "of" or "pertaining to" Ellacombe, meaning Ellacombe's
Sedum. However, the internal spelling of the species epithet has differed across later resources, some consistent to the original "ellacombian-", others using altered "ellacombean-". Per the applicable
Code for Nomenclature (Article 60.8 [d]) then, "If the personal name ends with a vowel, adjectival epithets are formed by adding ‑an- plus the nominative singular inflection appropriate to the gender of the generic name". In accordance, "ellacombean-" has been subsequently widely adopted as the accepted spelling. ==References==