Friday, May 24, 2019

[Botany • 2019] Populus primaveralepensis (Salicaceae, Malpighiales) • A New Species of White Poplar from the Bosque La Primavera Biosphere Reserve in western Mexico


 Populus primaveralepensis 
A.Vázquez, Muñiz-Castro & Zuno

in Vázquez-García, Muñiz-Castro, Martínez-González, et al., 2019. 

Abstract
 Populus primaveralepensis A.Vázquez, Muñiz-Castro & Zuno sp. nov., a new species from relict gallery cloud forest in Bosque La Primavera Biosphere Reserve (Mexico), is described and illustrated. The new species belongs to P. subsect. Tomentosae Hart., and is morphologically similar to P. luziarum A.Vázquez, Muñiz-Castro & Padilla-Lepe, but differs from it in having taller trees without root suckers, white and ringed young stems and branches, a branching angle of ca 45º, leaves with higher blade to petiole ratio, leafs frequently elliptic or ovate to widely ovate (vs widely ovate to ovatedeltoid), denser inflorescences, and shorter capsules. The conservation status of the species was assessed as Critically Endangered (CR).

Keywords. Mexico, Populus luziarum, Populus simaroa, Populus sect. Aigeiros, Salicaceae.



Fig. 1. Populus primaveralepensis A.Vázquez, Muñiz-Castro & Zuno sp. nov. 
A–E, I–K. VázquezGarcía et al. 10106c leg., IBUG. F–H. Vázquez-García et al. 10106b leg., IBUG. A. Variability of leaves. B. Leaf bud. C. Branch with female inflorescence. D–E. Early and late state of inflorescence. F–G. Late and early male inflorescence. H. Male flower. I. Infrutescence with pappus. J. Capsule complete and in half, with pappus. K. Developing gynoecium. Illustrations: E. E. Vázquez-Verdejo.

Fig. 3. Populus primaveralepensis A.Vázquez, Muñiz-Castro & Zuno sp. nov., male individual, Vázquez-García et al. 10106b leg., IBUG. A–B. Two views of same branch with inflorescence past anthesis. C. Inflorescence at anthesis. D. Branch showing leaf variability and venation. Photographs: A. Vázquez.

Fig. 4. Populus primaveralepensis A.Vázquez, Muñiz-Castro & Zuno sp. nov., female individual, Vázquez-García et al. 10106c leg., IBUG. A. Inflorescence at anthesis. B. Inflorescence past anthesis. C. Developing infrutescence. D. Trunk. E. Branch with leaves and dehiscing capsules, showing the whitish pappus of seeds. Photographs: A. Vázquez.

Populus primaveralepensis A.Vázquez, Muñiz-Castro & Zuno sp. nov.
Fig. 3. male individual, Vázquez-García et al. 10106b leg., IBUG. A–B. Two views of same branch with inflorescence past anthesis. C. Inflorescence at anthesis. D. Branch showing leaf variability and venation. 
Photographs: A. Vázquez.
Fig. 2. Tree showing its habit and bark. J. Padilla Lepe, standing next to the tree; 
photograph: O. Ibarrarán.

Class Magnoliopsida Brongn.
Order Malpighiales Juss. ex Bercht. & J.Presl

Family Salicaceae Mirb.

Genus Populus L.
Section Populus Subsection Tomentosae Hart.

Populus primaveralepensis A.Vázquez, Muñiz-Castro & Zuno sp. nov. 

Differential diagnosis Populus primaveralepensis sp. nov. is morphologically close to P. luziarum, but it differs from the latter in possessing various qualitative and quantitative characters, such as having taller trees with nonsoboliferous habit, branching angle of ca 45º with white and ringed bark, and leaves with higher blade to petiole ratio (large leaves with petioles 2.9–3.9 vs 5.4–6 cm long, leaf blades frequently elliptic or ovate to widely ovate vs widely ovate to ovate-deltoid, 17–18.5 vs 15.5–16 cm long, inflorescences dense vs sparse, and shorter capsules, 1.0–1.8 vs 2.0–2.5 mm (Table 1).
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Etymology: The epithet honors the collective conservation accomplishments at Bosque La Primavera for its twelfth anniversary as a MaB–UNESCO Biosphere Reserve as well as the biologist Jesús Padilla Lepe, a young and enthusiastic botanical explorer graduated from the Universidad de Guadalajara who discovered the species.

Ethnobotany: The species is locally known as “álamo”. There is no available information on the use of the species in Jalisco; however, sometimes it is kept as a shade tree for cows. Like other species in the genus Populus, P. primaveralepensis sp. nov. is a potential source of cellulose fibers, and can be used as an ornamental tree, or for restoration of watersheds in central Jalisco.


J. Antonio Vázquez-García, Miguel Ángel Muñiz-Castro, Rosa Elena Martínez-González, Gregorio Nieves-Hernández, María Guadalupe Pulido-Ávila, Gerardo Hernández-Vera and Osvaldo Zuno Delgadillo. 2019. Populus primaveralepensis sp. nov. (Salicaceae, Malpighiales), A New Species of White Poplar from the Bosque La Primavera Biosphere Reserve in western Mexico. European Journal of Taxonomy. 498: 1–16.  DOI:  10.5852/ejt.2019.498

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