Goeppertia rhizanthoides

Goeppertia rhizanthoides (H.Kenn.) J.M.A.Braga is an accepted species of Marantaceae endemic to Panama. The GBIF Backbone Taxonomy records the accepted name under key 9332989, confirming the authorship as (H.Kenn.) J.M.A.Braga [3]. Plants of the World Online, maintained by the Royal Botanic Gardens, Kew, lists Goeppertia rhizanthoides as an accepted species within Goeppertia Nees [4].

The species belongs to Goeppertia Nees, which Borchsenius, Suárez and Prince established in 2012 as the appropriate genus for the majority of species previously treated as Calathea G.Mey., following a molecular phylogenetic analysis that demonstrated Calathea as previously circumscribed was polyphyletic [5]. The genus is estimated to encompass approximately 260 accepted species [3]. Goeppertia rhizanthoides is one of a small number of species that entered Goeppertia via a separate, subsequent combination rather than through the 246 combinations published in the 2012 revision, because its basionym was described simultaneously with or after that revision [2].

The basionym of this species is Calathea rhizanthoides H.Kenn., published by Helen Kennedy in 2012 in the Journal of the Botanical Research Institute of Texas 6(1): 49–52, in a paper describing two new Marantaceae species endemic to Panama [1]. The epithet rhizanthoides refers to the morphological character of the rhizome-borne inflorescence, which serves as the primary diagnostic marker of the species.

The combination Goeppertia rhizanthoides (H.Kenn.) J.M.A.Braga was published by João Marcelo Alvarenga Braga in 2014 in Phytotaxa 167(1): 143–144 [2]. Braga's paper transferred three recently described Panamanian Calathea species, namely C. basiflora, C. rhizanthoides, and C. peregrina, into Goeppertia, noting that because the majority of Calathea species had been placed in Goeppertia by Borchsenius, Suárez and Prince in 2012, the same transfer was required for species described after that revision [2].

The synonym Calathea rhizanthoides H.Kenn. continues to appear in some horticultural literature. It is not the accepted name according to either the GBIF Backbone Taxonomy [3] or Plants of the World Online [4]. The registry records Calathea rhizanthoides as a synonym and Goeppertia rhizanthoides (H.Kenn.) J.M.A.Braga as the accepted epithet.

Kennedy's 2012 protologue identifies two morphological features as diagnostic for Calathea rhizanthoides (now Goeppertia rhizanthoides): the single leaf per shoot, and the inflorescence borne on a separate, leafless shoot arising directly from the rhizome [1]. The second character, the rhizome-borne inflorescence on a leafless axis, is the primary diagnostic marker and the direct source of the specific epithet. Kennedy described the species alongside Calathea peregrina H.Kenn. as new taxa for the Flora Mesoamericana, placing both in the Panamanian endemic flora [1].

Braga's 2014 combination paper groups rhizanthoides with G. basiflora and G. peregrina as species recently documented from wild material in Panama and recently described for the Flora of Panama, situating all three in the same biogeographic and morphological context of newly characterised, Panama-endemic taxa within a redefined Goeppertia [2]. Plants of the World Online records the closely related Goeppertia basiflora (H.Kenn.) J.M.A.Braga, published by Kennedy in the same year and transferred to Goeppertia in the same paper, as a perennial or rhizomatous geophyte growing primarily in the wet tropical biome [4].

Goeppertia rhizanthoides is documented as endemic to Panama. Kennedy's 2012 protologue explicitly records the species as endemic to Panamá and prepared for inclusion in the Flora Mesoamericana [1]. Braga's 2014 combination paper groups it with G. basiflora and G. peregrina as species recently described for the flora of Panama, confirming the geographic context [2].

Plants of the World Online records Goeppertia basiflora, published by Kennedy in the same year and transferred by Braga in the same paper, as native to Panama and growing primarily in the wet tropical biome [4]. That biogeographic context is consistent with the treatment of rhizanthoides throughout the Kennedy and Braga papers, though the POWO entry for G. rhizanthoides itself did not return a dedicated native range statement in the searches conducted for this record [4]. The GBIF Backbone Taxonomy carries the name at key 9332989 without a documented range entry [3].

No IUCN Red List assessment for this species was located in the sources consulted. Limited authoritative sources available; further research needed on range extent, precise type locality, and conservation status.

The Digital Towns registry records in_cultivation as true for this species. Kennedy's 2012 protologue describes the species in the context of taxonomic discovery for the Flora Mesoamericana, not in a cultivation context [1]. Braga's 2014 combination paper is a nomenclatural paper and provides no statement about the species in cultivation [2]. Both papers concern species documented from wild material in Panama.

No botanical garden accession records, no published cultivation account, and no citable horticultural literature source explicitly confirming cultivation of Goeppertia rhizanthoides have been located in the sources consulted for this record. Limited authoritative sources available; further research needed on the cultivation history, distribution in living collections, and any documented horticultural use of Goeppertia rhizanthoides.

No International Cultivar Registration Authority has been appointed for Marantaceae. The International Society for Horticultural Science maintains the list of appointed ICRAs by family; Marantaceae does not appear on that list [7]. The Digital Towns registry records icra_authority as null and dt_is_icra as false for Goeppertia.

Because no ICRA exists for Marantaceae, no cultivar registration system is in operation for the family. Cultivar names applied to Goeppertia species circulate in the trade without the oversight of an appointed authority and without a formal register. The International Code of Nomenclature for Cultivated Plants (ICNCP) requires that a cultivar epithet be enclosed in single quotation marks; that requirement applies to any future cultivar selection from G. rhizanthoides, but compliance cannot be verified or enforced in the absence of an appointed ICRA.

Goeppertia rhizanthoides has no registered cultivars in the Digital Towns registry, and no cultivar selections from this species have been located in any primary source consulted for this record.