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| Ouratea yamamotoana Fraga, G.H.Shimizu & D.B.O.S.Cardoso, in Fraga, Shimizu & Cardoso, 2022. |
ABSTRACT
The new species Ouratea yamamotoana (Ochnaceae) from the Brazilian Atlantic Forest biodiversity hotspot is described and illustrated. The new species resembles Ouratea camposportoi, from which it differs by the persistent stipules, chartaceous leaves with cordate or slightly auriculate base, flowers with smaller pedicels, spathulate or elliptic petals, longer gynophore, and fruit with a subterete to clavate carpophore. It is assessed as Vulnerable (VU) using IUCN Red List criteria and highlights the threats to the highly endemic plant diversity of the Atlantic Forest.
Keywords: Brazil, Malpighiales, morphology, taxonomy
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| Vegetation physiognomy of the type locality and morphology of Ouratea yamamotoana Fraga, G.H.Shimizu & D.B.O.S.Cardoso, sp. nov. A, General view of the Atlantic Forest at Paraty, Rio de Janeiro, Brazil; B, habit and inflorescences; C, leaf; D, detail of a branch, showing the leaf bases; E, flower in frontal view; F, flower in side view; G, partial inflorescence showing flowers without stamens and petals (which have already fallen). Photograph A was taken by Leandro Jorge Telles Cardoso. Photographs B–G are of the paratypes, accession Miranda, M.R. 214 (SPSF) and Campos-Rocha, A. & Volet, D.P. 1616 (UEC), and were taken by M. R. Miranda (B, D–F) and A. Campos-Rocha (C, G). |
Ouratea yamamotoana Fraga, G.H.Shimizu & D.B.O.S.Cardoso, sp. nov.
Similar to Ouratea camposportoi Sleumer but differs by its persistent stipules (vs caducous in O. camposportoi); chartaceous leaves with cordate or slightly auriculate base and slightly revolute (vs leaves rigid chartaceous or coriaceous, with obtuse, truncated or rounded base, and distinctly revolute); flowers with pedicel measuring 6–8 mm long but reaching 7–11 mm long when in fruit, the petals spathulate or elliptic, and gynophore 1.2–1.8 mm long (vs pedicel 9–15 mm long when in flower and 14–16 mm long when in fruit, the petals obovate, and gynophore 0.9–1 mm long); and fruit with a subterete to clavate carpophore of 7–16 × 1.8–4 mm (vs carpophore elongate, piriform, 12–14 × 3.3–6.5 mm).
Etymology. The name pays homage to Professor Kikyo Yamamoto, who has made important taxonomic contributions to neotropical Ochnaceae, and especially Ouratea. She carried out an in-depth study of morphological traits to untangle the complex taxonomy of this genus and studied the Ouratea parviflora (A.DC.) Baill. species complex in her graduate studies. Kikyo has also played an important role training and guiding generations of plant systematists at Unicamp in São Paulo, Brazil, for over 30 years.
C.N. Fraga, G.H. Shimizu and D.B.O.S. Cardoso. 2022. Ouratea yamamotoana (OCHNACEAE), A New Species from the Brazilian Atlantic Forest. EDINBURGH JOURNAL OF BOTANY. 79, 406: 1–9. DOI: 10.24823/EJB.2022.406
