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 ovate-deltoid), denser inflorescences, and shorter capsules. The conservation status of the species was assessed as Critically Endangered (CR).
Highlights
The genus Populus L. (Salicaceae Mirb., Malpighiales Juss. ex Bercht. & J.Presl) consists of 30 species of fast growing and deciduous trees and shrubs, with a boreal to subtropical distribution, and with a great ecological and economical importance (Eckenwalder 1996; Vázquez-García et al 2017)
Populus primaveralepensis sp. nov. was first collected at the Bosque La Primavera Biosphere Reserve (BLPBR) in 2009 from a single small tree, and the specimen was kept at IBUG (Harker et al 4045 leg.)
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)
Summary
The genus Populus L. (Salicaceae Mirb., Malpighiales Juss. ex Bercht. & J.Presl) consists of 30 species (aspens, cottonwoods, and poplars) of fast growing and deciduous trees and shrubs, with a boreal to subtropical distribution, and with a great ecological and economical importance (Eckenwalder 1996; Vázquez-García et al 2017). In Mexico, the genus currently comprises ten species, belonging to four sections: P. sect. Tacamahaca Spach (Eckenwalder 1977a, 1977b; Rzedowski 1985; Vázquez-García & Cuevas-Guzmán 1989; MartínezGonzález & González-Villarreal 2002, 2005; Vázquez-García et al 2017). Five species are reported from western and southern Mexico, one belonging to P. sect. Mesetae Eckenw., from northern Jalisco and the region Los Altos (Eckenwalder 1977a, 1977b; Martínez-González & González-Villarreal 2002), and four of them belonging to P. sect. Tomentosae Hart.), endemic to the Jaliscan region of the Sierra Madre del Sur (Vázquez-García & Cuevas-Guzmán 1989), P. luziarum A.Vázquez, Muñiz-Castro & PadillaLepe, endemic to the municipality of Zapopan, Jalisco (Vázquez-García et al 2017), P. simaroa Rzed. Trepidae (Dode) Tamm) recorded from the municipality of Mezquitic, Jalisco (Michaux 1803; Martínez-González & González-Villarreal 2002)
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