Research Article |
Corresponding author: Robin Fernandez-Hilario ( rfernandez@lamolina.edu.pe ) Academic editor: Eric Tepe
© 2017 Robin Fernandez-Hilario, Stacey D. Smith.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Fernandez-Hilario R, Smith SD (2017) A new species of Saracha (Solanaceae) from the Central Andes of Peru. PhytoKeys 85: 31-43. https://doi.org/10.3897/phytokeys.85.12607
|
Saracha andina Rob. Fernandez, I. Revilla & E. Pariente, sp. nov. (Solanaceae), a new species endemic to the central Andes of Peru, is described here. The new species differs from other species of Saracha Ruiz & Pav. by the combination of small and coriaceous leaves and clearly tubular flowers. A summary of the taxonomic history of the genus Saracha, an identification key for its species and a phylogenetic analysis of this genus and related genera are provided.
Saracha andina Rob. Fernandez, I. Revilla & E. Pariente, sp. nov. (Solanaceae), una nueva especie endémica de los Andes centrales del Perú se describe aquí. La nueva especie se distingue de las demás especies de Saracha Ruiz & Pav. por poseer hojas coriáceas pequeñas y flores claramente tubulares. Se proporciona un resumen de la historia taxonómica del género Saracha, una clave de identificación revisada para sus especies y un análisis filogenético del género y géneros afines.
Saracha , Solanaceae , Peru, Andes, relict forests
Saracha , Solanaceae , Perú, Andes, bosques relictos
The genus Saracha Ruiz & Pav. (Solanaceae) comprises two species of sometimes armed shrubs and small trees, with subcoriaceous to coriaceous leaves, pendant campanulate to tubular flowers, and fruits that blacken when mature. The species are distributed from Venezuela to Bolivia from 2200 to 4500 m.a.s.l. (
Despite its small size, Saracha presents a complex taxonomic history. In
Years later,
Due to the type chosen for Poecilochroma, Miers had created a superfluous genus which therefore had to be rejected (Art. 52.1 of the International Code of Nomenclature;
The nomenclatural confusion was clarified by
Recent phylogenetic studies have clarified the evolutionary history of Saracha. The genus falls within the fleshy-fruited subfamily Solanoideae, but is distantly related to Jaltomata (
During botanical collections carried out in the Department of Ayacucho as part of the “Inventario Nacional Forestal-Ecozona Sierra” in 2015, individuals were collected with clear affinities to the genus Saracha. After molecular phylogenetic analysis and the review of additional material across Peru, these individuals have been recognized as a distinct undescribed species. In this article, we provide a complete description of this new species, along with ecological information and a revised identification key for the genus.
The description was made through examination of herbarium specimens deposited in COLO, F, HSP, MO, MOL and USM (acronyms according to the Index Herbariorum, http://sweetgum.nybg.org/science/ih/), and notes taken during the study of individuals in the field. Conservation status was assigned using IUCN criteria (
For molecular phylogenetic analysis, genomic DNA was extracted from silica-dried plant material (S. Smith & R. Fernandez 594) using the CTAB method (
Saracha andina affine S. punctata Ruiz & Pav., sed foliis coriaceus parvus, corolla tubularis et bacca ovoideus differt.
PERÚ. Ayacucho: Prov. Lucanas, Dist. Ocaña, Centro Poblado San José de Tomate [CP Pachaca] – Sector Palca, 14°18'12.9"S, 74°45'33.11"W, 3700 m, 26 Jun 2015 (fl, fr), E. Pariente, R. Fernandez & L. Ríos 110 (holotype MOL; isotypes MOL, USM, HSP).
Shrub to 2.5 m tall, widely branched from the base; younger stems, petioles and flowers pubescent with unbranched trichomes; older stems cylindrical, to 5 cm in diameter, finely striated, ash-colored; younger stems circular in cross section, 3–4.5 mm in diameter, dark, densely pubescent; internode 3–8 mm long; spines 0.9–1.5 cm long, 0.5–ca. 1 mm in diameter at the base. Leaves simple, alternate and spirally arranged, rarely geminate; petiole 2–3 (–5) mm long, planoconvex and slightly grooved, light green, moderately pubescent, but more densely so in the basal part; leaf blades (1.2–) 1.6–2.3 (–2.7) cm long, 0.6–1.4 cm wide, coriaceous, shiny, oblong to broadly elliptic, sometimes oblong-obovate, the apex obtuse, the base acute-attenuate, the margin entire and slightly revolute when dry, the adaxial surface dark green and glabrous, the abaxial surface light green with dispersed unbranched trichomes on the midrib, leaf blades concolorous when dry, the venation brochidodromus, inconspicuous, with (4–) 5–6 secondary veins. Inflorescences terminal or axillary, fascicled, with 1–2 flowers; buds ellipsoid, green with purple spots, densely pubescent. Flowers pendulous, hermaphroditic, actinomorphic; pedicels moderately pubescent, 23–27 mm long, 1–1.5 mm in diameter, green to dark purple; calyx narrowly campanulate, green to dark purple, 8.5–9.5 mm long, 4–5 mm wide, the outer surface moderately pubescent, the inner surface glabrous to minutely puberulent, the lobes 5, acute, 2–2.5 mm long, 3–3.5 mm wide, tomentose at the apex; corolla tubular, yellow at anthesis, sometimes tinged blue or purple, 25–35 mm long, 8–10 mm in diameter, the base slightly narrowed, 4–6 mm in diameter, the inner surface pubescent at the base, the outer surface densely pubescent with uniformly dispersed unbranched trichomes, the lobes 5, acute, 2–2.4 mm long, 4–6 mm wide; stamens 5, equal, filaments, white, flattened, adnate to the base of the corolla, 25–28 mm long, densely pubescent at the base, becoming glabrous at the apex; anthers oblong, 4.5–5.5 mm long, 2–3 mm wide, basifixed, with longitudinal dehiscence, the connective 4–4.5 mm long; ovary conical and glabrous, 3–3.5 mm long, 2–2.5 mm in diameter at the base; style glabrous, 17.5–18 mm long, ca. 0.5 mm wide; stigma clavate, 0.5 mm long, ca. 0.7 mm wide. Fruit a berry, ovoid and apiculate, black at maturity, 10–13 mm long, 7–8 mm in diameter, the tip 1–1.5 mm long; fruiting calyx slightly accrescent, 5–7 mm long; fruiting pedicels puberulent to moderately pubescent. Seeds not seen.
Saracha andina is a shrub endemic to the scrub and relict forests in the central Andes of Peru (Depts. Ayacucho, Huancavelica and Lima) at over 3500 to 4000 m in elevation (Fig.
Flowering and fruiting from June to September. Characteristics of the flower suggest pollination by hummingbirds (
In Pachaca (Dept. Ayacucho) it is commonly known as “checc-ches” in where the native people mention that strong and straight branches had been used for yarning wool (pers. comm.).
According to the IUCN Red List Categories (
PERÚ. Ayacucho, Prov. Lucanas, Dist. Ocaña: Centro Poblado de Pachaca, Sector Palca, 14°18'12.9"S, 74°45'33.11"W, 3700 m, 26 Jun 2015 (fl, fr), R. Fernandez et al. 973 (HSP, MOL); Carretera Palpa-Laramate-Pachaca, ca. 3 km past Pachaca toward el puno, 14°18'12.06"S, 74°45'33.08"W, 3750 m, 09 Jul 2016 (fl), S. Smith & R. Fernandez 594 (COLO, F, MO, USM); Huancavelica, Prov. Huaytará, Dist. Huaytará: Ruinas de Incahuasi, 13°34'25.77"S, 75°15'14.33"W, 3798 m, 15 Aug 2014 (fl, fr), P. Gonzáles et al. 3385 (USM); Carretera Los Libertadores, km. 130, pasando el puente Yuraccasa, 13°34'53.07"S, 75°16'42.96"W, 3800–3850 m, 26 Jun 2001 (fl), J. Roque & C. Arana 3309 (USM); Puente Mollepallana on road Pisco-Ayacucho, 3900–4000 m, 29 Sep 1997 (fl), M. Weigend & H. Forther 97/604 (USM); Lima, Prov. Canta: Acacay, cerca a Huacoy, 29 Jul 1960 (fl), C. Acleto 207 (USM); Ruta Canta-Obrajillo-Huacos, catarata Ongongoy, ca. 2 km NE de Huacos, 11°23'57.41"S, 76°36'11.70"W, 3900 m, 11 Jul 2016 (fl), S. Smith 596 (COLO, MO, MOL, USM); Lachaqui, cuesta de Yacanhuana, 3800 m, 27 Mar 1973 (fl), G. Vilcapoma 188 (MOL, USM); Lachaqui, camino a Quinana, 3900 m, 02 Feb 1979 (fl), G. Vilcapoma 302 (MOL, USM); Huacos, catarata de Ongongoy, 3500 m, 09 Sep 2001 (fl), G. Vilcapoma 5564 (MOL, USM).
Saracha andina differs from other species of the genus in its small oblong to broadly elliptic leaves 12–27 × 6–14 mm with inconspicuous nerves and tubular flowers 33.5–35 mm long. In contrast, S. punctata has elliptic leaves 20–150 × 8–60 mm and widely campanulate flowers, and S. quitensis has shorter tubular to infundibuliform flowers 12–26 mm long (Figure
Saracha species. A Saracha punctata (R. Fernandez et al. 260; MOL) B Saracha quitensis (S. Smith 257; MO) C Saracha andina (P. Gonzáles et al. 3385; USM) D Saracha andina (R. Fernandez et al. 973; MOL) E Saracha punctata (R. Fernandez 998; MOL) F Saracha quitensis (S. Smith 257; MO) G Saracha andina (R. Fernandez et al. 973; MOL). Photos by: A, D, E, G Robin Fernandez; B, F Stacey Smith; C Paul Gonzáles.
Maximum likelihood phylogeny of Iochrominae (sensu Smith & Baum, 2006) showing placement of Saracha andina. The outgroups (Physalis peruviana, Leucophysalis grandiflora, Witheringia solanacea, Tubocapsicum anomalum, Cuatresia colombiana, and Larnax sachapapa) have been pruned from the tree. Bootstrap support (>70%) is indicated.
1 | Corolla broadly campanulate, mainly yellow or yellow green, usually purple or brown spotted; leaves subcoriaceous, 20–150 mm long | S. punctata |
– | Corolla tubular to tubular-infundibuliform, purple or yellow, sometimes with purple spots or tinges; leaves coriaceous, 10–90 mm long | 2 |
2 | Inflorescences with 4–10 flowers; corolla tubular-infundibuliform, 12–26 mm long; leaves 10–90 mm long; fruits globose with glabrous pedicels | S. quitensis |
– | Inflorescences with 1–2 flowers; corolla tubular, 25–35 mm long; leaves 12–27 mm long; fruits ovoid with puberulent to pubescent pedicels | S. andina |
The maximum likelihood phylogenetic analysis places S. andina together with the other members of Saracha with high bootstrap support (91%, Figure
The first author thanks Carlos Reynel (MOL) for his valuable comments on the manuscript and Consultores Asociados en Naturaleza y Desarrollo (CANDES) for logistical support during the collection of the type material in Ayacucho region. We also thank Paul Gonzáles (USM) for advice and for photographs from his field collections, as well as Thomas Mione and Lynn Bohs for valuable feedback on the manuscript. This work was supported in part by NSF DEB-1355518 and 1553114 to S.D.S. We thank the Servicio Nacional Forestal y de Fauna Silvestre (SERFOR) - Ministerio de Agricultura y Riego of Peru for permission to collect and study this species (Nº 0259-2016-SERFOR-DGGSPFFS).