Weberbauera incisa (Brassicaceae), a New Species from Southern Peru Ihsan A. Al-Shehbaz Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.
[email protected] Paul Gonza´les and Asuncio´n Cano Laboratorio de Flor´ıstica, Departamento de Dicotiledo´neas, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos (UNMSM), Av. Arenales 1256, Lima 11, Peru; Instituto de Investigacio´n de Ciencias Biolo´gicas Antonio Raimondi (ICBAR), Facultad de Ciencias Biolo´gicas, UNMSM, Ciudad Universitaria, Av. Venezuela, Cdra. 34 s/n, Lima 1, Peru.
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ABSTRACT. Weberbauera incisa Al-Shehbaz, P. Gonza´les & A. Cano (Brassicaceae), a new species from southern Peru, is described and illustrated. It differs from the closely related W. spathulifolia (A. Gray) O. E. Schulz by being completely glabrous and by having incised leaves, flattened and papery petioles of basal leaves, and torulose fruits. Key words: Brassicaceae, Cruciferae, IUCN Red List, Peru, Weberbauera. Weberbauera Gilg & Muschl. (Brassicaceae or Cruciferae) is a South American genus of 24 species (including the novelty below) distributed from northern Peru southward into the southern Patagonian parts of Argentina and Chile (Al-Shehbaz, 2012; Al-Shehbaz et al., 2013). It is most highly diversified in Peru, where 15 species (11 endemic) grow (AlShehbaz, 1990, 2004). Many of the remote areas of southern Peru remain poorly explored, and novelties continue to be discovered with more fieldwork. The new Weberbauera below and two recently described species (Al-Shehbaz & Montesinos, 2009; Al-Shehbaz et al., 2013) demonstrate that. Weberbauera incisa Al-Shehbaz, P. Gonza´les & A. Cano, sp. nov. TYPE: Peru. Depto. Puno: Prov. Carabaya, Distr. Corani, Minaspata, arriba del campamento Corani, Suelo crioturbado, 5000 m, 14803919.5899S, 70841926.1699W, 28 Mar. 2014, P. Gonza´les 3107 (holotype, USM-00279111; isotype, MO-6597320). Figure 1. Haec species a Weberbauera spathulifolia (A. Gray) O. E. Schulz planta omnino glabra, foliorum basalium petiolis applanatis papyraceis, laminibus incisis atque fructibus torulosis distinguitur.
Herbs perennial; caudex simple or branched, thick, to 1 cm diam., covered with papery petiolar
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remains of previous years; trichomes absent; stems ascending, simple, 4–6 cm tall. Basal leaves rosulate; petioles 2–3 cm, strongly flattened, 3–5 mm wide at base, persistent, becoming papery in subsequent seasons; blades oblong to oblanceolate, 2–3 3 0.5–1 cm, thin, glabrous, incised, apex acute; cauline leaves subsessile, incised, all as bracts, oblong to oblanceolate, 1–1.5 cm, reduced in size upward. Racemes 4- to 7-flowered, bracteate throughout, becoming lax in fruit; fruiting pedicels 2–4 mm, straight, ascending, glabrous. Sepals ovate, ca. 2 mm, caducous, glabrous; petals white, oblanceolate, ca. 3 3 1 mm, attenuate to base; filaments white, ca. 1.5 mm; anthers ovate, ca. 0.5 mm; ovules 8 to 10 per ovary. Fruit linear, 8–12 3 0.8–1 mm, ascending, straight, terete; valves torulose, glabrous, with a distinct midvein; septum complete; style 0.2–0.3 mm; seeds oblong, 1.3–1.5 3 0.7–0.8 mm. IUCN Red List category. Weberbauera incisa is only known from the type collection and is therefore given the assessment of Data Deficient (DD), according to IUCN (2001) criteria. Discussion. Weberbauera incisa is most closely related to W. spathulifolia (A. Gray) O. E. Schulz, the most widespread species in the genus, where it grows in Argentina (Catamarca, Jujuy, La Rioja, Tucuma´n), Bolivia (La Paz, Oruro, Potos´ı), Chile (Regio´n I), and ´ Lima, Peru (Ancash, Cuzco, Huancavelica, Junın, Moquegua, Pasco, Puno). They resemble each other in having rosulate basal leaves, white flowers, terete fruits, subsessile cauline leaves, and bracteate racemes, at least in some forms of the latter species. However, the new species is easily distinguished from W. spathulifolia by being glabrous throughout (vs. sparsely to moderately pubescent with simple and short-stalked submalpighiaceous trichomes) and by having incised (vs. entire to repand or dentate)
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Figure 1. Weberbauera incisa Al-Shehbaz, P. Gonza´lez & A. Cano. —A. Plant. —B. Basal leaf. —C. Petal. —D. Fruit and fruiting pedicel. —E. Seed. Drawn by Al-Shehbaz from the isotype, P. Gonza´les 3107 (MO).
basal leaves with strongly flattened (vs. terete) petioles that become papery (vs. often withered) in subsequent seasons, and torulose (vs. smooth) fruits. Furthermore, all cauline leaves in W. incisa are
bracts, whereas in W. spathulifolia most of the cauline leaves are not bracts, and the racemes are bracteate only basally or sometimes throughout, or ebracteate.
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Acknowledgments. We thank Blanca Leo´n (TEX) for her help, Henk van der Werff for his critical review, and Victoria Hollowell and the Missouri Botanical Garden Press staff for their editorial advice. Al-Shehbaz is profoundly grateful to the United States National Science Foundation for the OPUS grant DEB-1252905 that supported part of this research.
Al-Shehbaz, I. A. 2012. A generic and tribal synopsis of the Brassicaceae (Cruciferae). Taxon 61: 931–954. Al-Shehbaz, I. A. & D. B. Montisenos. 2009. Weberbauera arequipa (Brassicaceae), a new species from Peru. Novon 19: 281–283. Al-Shehbaz, I. A., A. Cano, H. Trinidad & E. Navarro. 2013. New species of Brayopsis, Descurainia, Draba, Neuontobotrys, and Weberbauera (Brassicaceae) from Peru. Kew Bull. 68: 219–231. IUCN. 2001. IUCN Red List Categories and Criteria, Version 3.1. Second edition. Prepared by the IUCN Species Survival Commission. IUCN, Gland, Switzerland, and Cambridge, United Kingdom. ,http://www.iucnredlist.org/ technical-documents/categories-and-criteria/2001categories-criteria., accessed 22 December 2014.
Literature Cited Al-Shehbaz, I. A. 1990. A revision of Weberbauera (Brassicaceae). J. Arnold Arbor. 71: 221–250. Al-Shehbaz, I. A. 2004. A synopsis of the South American Weberbauera (Brassicaceae). Novon 14: 258–268.
