Cenostigma diversifolium (Benth.) Gaem, 2021

Gaem, Paulo Henrique, 2021, A nomenclatural note in Cenostigma (Leguminosae, Caesalpinioideae), Phytotaxa 498 (2), pp. 150-151 : 150

publication ID

https://doi.org/ 10.11646/phytotaxa.498.2.9

persistent identifier

https://treatment.plazi.org/id/03FC87E7-FFAC-FFE4-FF0D-7DA0F2EDF829

treatment provided by

Marcus

scientific name

Cenostigma diversifolium (Benth.) Gaem
status

comb. et stat. nov.

Cenostigma diversifolium (Benth.) Gaem View in CoL , comb. et stat. nov.

Basionym:— Caesalpinia pyramidalis var. diversifolia Bentham (1870: 69) View in CoL Poincianella pyramidalis var. diversifolia (Benth.) L.P. Queiroz (2010: 12) View in CoL Cenostigma pyramidale var. diversifolium (Benth.) Gagnon & G.P.Lewis (2016: 71) View in CoL . Type: BRAZIL. Maranhão: June 1841, Gardner 6006 (lectotype, designated by Lewis (1998); second-step lectotype, designated here: K000264577 [photo!]; isolectotypes: BM000952017 [photo!], K000264578 [photo!]).

A group of very similar taxa includes Cenostigma bracteosum ( Tulasne 1844: 141) Gagnon & G.P.Lewis View in CoL in Gagon et al. (2016: 88), C. nordestinum Gagnon & G.P.Lewis View in CoL in Gagon et al. (2016: 90), C. diversifolium comb . et stat. nov., and C. pyramidale ( Tulasne 1844: 139) Gagnon & G.P.Lewis View in CoL in Gagon et al. (2016: 93), the two latter hitherto been considered varieties of the same species. These species are very similar in vegetative features and can be distinguished as pointed out in great detail by Lewis (1994, 1998) and Queiroz (2009): Cenostigma pyramidale View in CoL s.s. is promptly recognised by the articulated pedicels below the middle of their lengths (vs. articulated directly below the ovary region in the other three taxa). Cenostigma bracteosum View in CoL is characterised by its broadly ovate and showy bracts, and by larger lateral petals (15–17 mm long) (vs. not showy, ovate-lanceolate bracts and smaller lateral petals to 14 mm in the other three taxa). The two remaining species are distinguished from one another by the size of leaflets and bracts: those are greater in Cenostigma diversifolium View in CoL than in C. nordestinum View in CoL .

According to Lewis (1994, 1998), Cenostigma diversifolium and C. pyramidale s.s. (previously C. pyramidale var. diversifolium and C. pyramidale var. pyramidale , respectively) are distinguished from one another by terminal leaflet size, inflorescence indumentum colour, bract size, region of pedicel articulation, and standard claw apex, which sufficiently qualifies these taxa as independent species in the context where they are inserted and considering the current knowledge about this group, in my opinion. The same author also cites a resemblance between Cenostigma bracteosum and C. diversifolium , species that may frequently be misidentified without reproductive material.

In his book “ Caesalpinia : a revision of the Poincianella-Erythrostemon group”, Lewis (1998) designated the gathering Gardner 6006 at K as first-step lectotype of Caesalpinia pyramidalis var. diversifolia . At that time there was no barcoding system for Neotropical specimens in the Royal Botanic Gardens herbarium (G.P. Lewis, pers. comm.), and the two sheets of that collection were further considered two different specimens, receiving two different barcodes. Hence, I herein propose a narrowing second-step lectotypification according to Art. 9.17 of the International Code of Nomenclature for algae, fungi, and plants ( Turland et al. 2018).

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Fabales

Family

Fabaceae

Genus

Cenostigma

Loc

Cenostigma diversifolium (Benth.) Gaem

Gaem, Paulo Henrique 2021
2021
Loc

Cenostigma diversifolium

Gaem 2021
2021
Loc

Cenostigma pyramidale var. diversifolium (Benth.) Gagnon & G.P.Lewis (2016: 71)

Gagnon & G. P. Lewis 2016: 71
2016
Loc

Poincianella pyramidalis var. diversifolia (Benth.) L.P. Queiroz (2010: 12)

L. P. Queiroz 2010: 12
2010
Loc

Caesalpinia pyramidalis var. diversifolia

Bentham 1870: 69
1870
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