Dizygostemon riparius (Plantaginaceae, Gratioleae), a new species from Maranhão, northeastern Brazil

• ANDRÉ VITO SCATIGNA ^[1] ; CLENILMA MARQUES BRANDÃO ^[3] ; GABRIEL DALLA COLLETTA ^[1] ; ROGÉRIO DE MESQUITA TELES ^[4] ; Kiany Sirley Brandão Cavalcante ^[3] ; Vinicius Castro Souza ^[2] ; André Olmos Simões ^[1]
  1. [1] Universidade Estadual de Campinas

     Universidade Estadual de Campinas

     Brasil

     
  2. [2] Universidade de São Paulo

     Universidade de São Paulo

     Brasil

     
  3. [3] Programa de Pós-graduação em Química, Departamento de Química, Instituto Federal de Educação, Ciência e Tecnologia do Maranhão, São Luís, Maranhão, Brazil.
  4. [4] Departamento Acadêmico de Química, Instituto Federal de Educação, Ciência e Tecnologia do Maranhão, São Luís, Maranhão, Brazil

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• Localización: Willdenowia: Annals of the Botanic Garden and Botanical Museum Berlin-Dahlem, ISSN 0511-9618, ISSN-e 1868-6397, Vol. 49, Nº. 2, 2019, págs. 177-186
• Idioma: inglés
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  • Here we describe and illustrate Dizygostemon riparius (Plantaginaceae, Gratioleae) as a new species from the state of Maranhão, northeastern Brazil. We present morphological and micromorphological descriptions and comparisons, along with illustrations, photographs, and information on its taxonomy, habitat, geographic distribution and conservation status. Dizygostemon riparius differs from D. floribundus, the only other accepted species of the genus, by having the stems sparsely to densely tomentose, the sepals as long as or slightly longer than the corolla tube, the posterior sepal to 1.5 times as wide as any of the other four, the ovary glandular villous, and the leaves larger. The new species is assessed as Endangered (EN) according to IUCN categories and criteria. Additionally, we provide diagnostic features that help to differentiate Dizygostemon from the similar Brazilian genera Achetaria, Stemodia and Tetraulacium.