Bauhinia marginata ( Bongard 1838: 127 ) Steudel (1840: 191)

Amorim, Daniele Dos Santos De & Pessoa, Edlley, 2025, Bauhinia s. s. (Fabaceae-Cercidoideae) from Baixada Cuiabana, Mato Grosso, Brazil: a neglected center of diversity for the genus, Phytotaxa 681 (2), pp. 146-166 : 157-159

10. Bauhinia marginata ( Bongard 1838: 127) Steudel (1840: 191) ( Figure 4B )

= Pauletia marginata Bongard (1838: 127)

Type: — Brazil. São Paulo: “in campis siccis Rio Pardo ”, September 1826, L. Riedel 621 (lectotype designated here: LE00002273 photograph!; isolectotype: LE00002274 photograph!) .

Shrubs, ca. 2 m tall. Branches armed, extrafloral nectaries absent. Stipules caducous, not observed. Leaves unifoliolate, petiole 1.5–3.8 × 0.1 cm; leaf blade 4.0–9.8 × 3.5–8.4 cm, bilobed, base cordate, apex of the lobes rounded, leaflets elliptic to ovate. Inflorescence terminal, peduncle 0.5–0.8 cm long; rachis 11.8–20 cm long, floral bracts absent. Flowers 18–28 per inflorescence; pedicel 1.0– 2.5 cm long; developed floral bud 3.2–3.6 cm long, apex winged, tubular; hypanthium 0.8–1.5 cm long, internally glabrous; sepals 2.8–3.8 cm long; petals ca. 2.1 × 0.1 cm, clawed, linear, apex acuminate; fertile stamens 5, homomorphic, 5 stamens with imperfect anthers, fertile stamen filaments 1.4–3.2 cm long; gynoecium, stipe 1.0– 3.2 cm long, ovary 0.8–1.2 cm long, with glandular trichomes, style 0.8–1.5 cm long, stigma clavate. Fruits ca. 11 × 1.2 cm.

Examined material: — Brazil. Mato Grosso: Cuiabá–Rosário Oeste , BR 364 , ca. de 60 km antes de Jangada, 21 April 1983, (bd.), C. N. Cunha et al. 939 ( UFMT) ; Chapada dos Guimarães, Salgadeira, 7 March 1985, (bd.), A. Oliveira F. 298 ( UFMT) ; Santo Antônio de Leverger , faixa intermediária da morraria do Mimoso, 12 April 1996, (fr.), Schewenk 06 & H. Ferreira ( UFMT) .

Distribution: This species is endemic to Brazil, occurring in the Central-West (MS and MT) and Southeast (SP) regions ( Vaz & Santos 2023, POWO 2023). It inhabits areas in the Cerrado domain ( Vaz & Santos 2023), and it is also found in disturbed areas.

Taxonomic comments: It belongs to Bauhinia sect. Pauletia ser. Pentandrae . B. marginata differs from B. pentandra by the elliptic to ovate leaflets with prominent marginal collecting veins in both faces, besides the tubular floral bud with winged apex and ovary with glandular trichomes.

Bongard (1838) described Pauletia marginata based on a material from São Paulo, Brazil, but the protologue does not indicate the collector of the type specimens and where they were deposited. Vaz (2011) mentions that the types were at LE, without citing their collector numbers. We found two specimens in this herbarium, LE00002274 and LE00002273, belonging to the collection Riedel 621; the typification of the name is thus necessary. According to Stafleu & Cowan (1983), most of Riedel’s collections are at LE, and in a visit to this collection in 1985, Fortunato incorrectly annotated the specimen LE00002273 as holotype. We conclude that this specimen represents the taxon well, due to its developed flowers and immature fruits, besides showing clear information on the label; we hereby designate it as lectotype.

Figures

FIGURE 4. Leaf morphology of species found in Baixada Cuiabana. A: Bauhinia malmeana Vaz & Lewis (D.S. Amorim 210); B: Bauhinia marginata (Bong.) Steud.; C: Bauhinia mollis (Bong.) Dietr.(A. Melo 1899 & A.K. Koch); D: Bauhinia pentandra (Bong.) Dietr. (G.A. Lima Jr. 509 & M. Ferreira da Silva); E: Bauhinia platypetala Burch. ex Benth. (G.A. Lima Jr. 648 et al.); F: Bauhinia pulchella Benth. (B. Wilke 5 et al.); G: Bauhinia ungulata L. (D.S. Amorim 205 et al.); H: Bauhinia vespertilio S.Moore (D.S. Amorim 214).