Wolffiella oblonga (Phil.) Hegelm., Bot. Jahrb. Syst.

Freitas, Rafaelle Neves, Silva, Maria Francilene Souza, Paiva, Jousimar Silva, Mayo, Simon Joseph & de Andrade, Ivanilza Moreira, 2017, Taxonomic survey of the Araceae Juss. in the coastal region of Piauí state, northeast Brazil, including the Rio Parnaíba Delta, Iheringia, Série Botânica 72 (3), pp. 341-350 : 349-350

8. Wolffiella oblonga (Phil.) Hegelm., Bot. Jahrb. Syst. 21(3): 303.189 5.

( Figs. 3 I-J, 4D)

Minute free-floating aquatic plant, 0.6-5 mm in height, stemless, roots absent. Fronds 2-3 (-6), asymmetric, curved or slightly falcate, ovate, submerged in the surface water film, 2-6 united at the vegetative cavity, together forming a colony (rarely united in a star shape), slender, apex rounded, tapered, base emersed, oblique, margin entire. Flowers and fruits not seen.

Selected material: Parnaíba : Braço do Rio Igaraçu, 29. V .2012, Freitas 82 ( HDELTA) .

Comments: Wolffiella oblonga sometimes forms starshaped colonies. This species was found along the margins of a polluted stream near a slaughterhouse, along with Pistia stratiotes , Eichhornia spp. , Lemna spp. and Wolffiella lingulata .

This species occurs in tropical and subtropical America ( WCSP 2015). In Brazil, it occurs in the Northeast (Bahia), Midwest (Mato Grosso do Sul, Mato Grosso), and South (Paraná, Santa Catarina) ( Coelho et al. 2015).

ACKNOWLEDGMENTS

We thank CNPq for financial support for the project Biodiversidade de Macrófitas Aquáticas do Delta do Parnaíba (processo no. 503494-2009-7), the project Mac- Doubles Fernandes do Nascimento de Apoio a Ciência, Tecnologia e Inovação, Prefeitura de Parnaíba, Piauí and the System for Authorization and Information on Biodiversity (ICMBio-SISBIO) and the project team, for their help in the field study.

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Figures

Figs. 3A-J. Araceae from the coastal region of Piauí. A-C. Spathicarpa gardneri Schott. A. Habit; B. Inflorescence; C. Detail of male (left) and female (right) flowers: D, E. Taccarum ulei Engl. & K. Krause. D. Habit, showing single leaf and inflorescence; E. Inflorescence; F-H. Wolffiella lingulata (Hegelm). Hegelm. F. Habit, side view of plant with two united fronds; G. Morphological variation of two-fronded plants; H. Plant with two fronds, seen from above; I, J. Wolffiella oblonga (Phil.) Hegelm. I. Plant with three united fronds seen from above; J. Habit in relation to the water surface, side view of three-fronded plant.