Ferdinand Schur's taxa of Iridaceae, their revision and effective typification of names

A taxonomic and nomenclatural account on taxa of Iridaceae proposed by Ferdinand Schur, a famous investigator of the flora of Transylvania (present‐day Romania), is presented. Types are designated for 12 names, namely lectotypes for Crocus banaticus var. niveus, C. exiguus, Iris fieberi var. monantha, I. × binata, I. × cucullata, I. pseudocyperus, I. transsilvanica, I. sibirica var. salina, and neotypes for C. banaticus var. concolor, C. banaticus var. pictus, C. banaticus var. versicolor and I. pumila var. albiflora. Based on a broad examination of Schur's original and authentic material, the taxonomic application of these names, as well as of his invalidly published and unpublished names (appearing only on herbarium labels), are clarified. It is proposed to treat I. fieberi var. monantha as a taxonomic synonym of I. aphylla, I. pumila var. albiflora and I. transsilvanica as synonyms of I. pumila, and I. sibirica var. salina as a synonym of I. spuria. The names I. × binata and I. × cucullata are accepted for the hybrids I. aphylla × pumila and I. × germanica × pallida, respectively. The treatment of I. pseudocyperus as a distinct subspecies within I. graminea is supported. All names validly published by Schur in Crocus are treated as synonyms of C. heuffelianus s.l. until an adequate taxonomic revision covering the southern Carpathian allotetraploid C. cf. heuffelianus (2n = 18) is implemented. If this polyploid deserves the rank of a distinct species, the name C. exiguus, which seems to be the earliest validly published, should be accepted for this taxon.