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Acta botánica mexicana

versão On-line ISSN 2448-7589versão impressa ISSN 0187-7151

Act. Bot. Mex  no.127 Pátzcuaro  2020  Epub 30-Maio-2020

http://dx.doi.org/10.21829/abm127.2020.1625 

Artículos de investigación

A new species of Annonaceae, endemic to the limestone karst forests of Chiapas, Mexico

Una especie nueva de Annonaceae, endémica de los bosques kársticos de Chiapas, México

Gaspar Moreno-Méndez1 
http://orcid.org/0000-0001-5858-2451

Andrés Ernesto Ortiz-Rodriguez2  3 
http://orcid.org/0000-0003-4583-6701

1Universidad de Ciencias y Artes de Chiapas, Facultad de Ciencias Biológicas, Herbario Eizi Matuda, Libramiento Norte Poniente 1150, Col. Lajas Maciel, 29039 Tuxtla Gutiérrez, Chiapas, México.

2Universidad Nacional Autónoma de México, Instituto de Biología, Departamento de Botánica, Ciudad Universitaria, Apdo. postal 70-367, 04510 Cd. Mx., México.

Abstract:

Background and Aims:

In Mexico, the Neotropical genera of Annonaceae tribe Miliuseae, including Sapranthus, Stenanona and the Mexican endemic genus Tridimeris, are particularly diverse and many of their species are endemic to this country. This diversity is not fully documented and many new species have been discovered as a result of recent botanical explorations in southern Mexico. Here, we describe a new species of Stenanona.

Methods:

We collected a new species of Stenanona during field work in a little known karst forest area located in the highlands of Chiapas, Mexico. The new species was recognized using the unique combination of features through comparisons with morphologically similar species and literature review. We assessed its conservation status by calculating its extent of occurrence (EOO) and its area of occupancy (AOO) using the GeoCAT tool and applying the IUCN Red List Categories and criteria.

Key results:

A new species of Annonaceae, namely Stenanona morenoi, endemic to karstic forests of southern Mexico, is described and illustrated. According to the criteria established by the IUCN, it is possible to tentatively determine the species as Critically Endangered (CR B1ab (iii)).

Conclusions:

Based on its general floral morphology, S. morenoi is hypothesized to belong to subclade A of the Desmopsis-Stenanona clade. Within this lineage, S. morenoi shares several morphological features with S. migueliana, S. stenopetala and S. zoque.

Key words: cauliflory; Miliuseae; Neotropics; tropical rainforest

Resumen:

Antecedentes y Objetivos:

En México, los géneros neotropicales de la tribu Miliuseae (Annonaceae), en específico Sapranthus, Stenanona y Tridimeris, son muy diversos y muchas de sus especies son endémicas de este país. No obstante, su diversidad total no está completamente documentada y como resultado de recientes exploraciones en el sur de México, muchas especies nuevas han sido colectadas. En este artículo, se describe una especie nueva de Stenanona.

Métodos:

Colectamos una especie nueva de Stenanona durante trabajo de campo en una zona de bosques kársticos poco estudiada y ubicada en las tierras altas de Chiapas, México. El reconocimiento de la especie nueva se basó en la correlación de varios caracteres morfológicos, a través de comparaciones con especies morfológicamente similares y revisión de literatura. Con base en las localidades conocidas para la nueva especie, calculamos su extensión de ocurrencia (EOO) y su área de ocupación (AOO) en GeoCAT, aplicando las categorías y criterios de la Lista Roja de la UICN, determinamos su estado de conservación.

Resultados clave:

Se describe e ilustra a Stenanona morenoi, una especie nueva de Annonaceae endémica de los bosques kársticos del sur de México. Con base en los criterios establecidos por la UICN, es posible determinar, de manera tentativa, que la especie está en peligro crítico (CR B1ab (iii)).

Conclusiones:

Dentro del clado Desmopsis-Stenanona, las características morfológicas que distinguen a S. morenoi sugieren una cercana relación filogenética con los miembros del subclado A. Dentro de este linaje, S. morenoi comparte varias características morfológicas con S. migueliana, S. stenopetala y S. zoque.

Palabras clave: bosque tropical perennifolio; caulifloría; Miliuseae; Neotrópico

Introduction

Tropical karst forests are very diverse biomes characterized by the high number of endemic species (Bystriakova et al., 2019). This huge diversity has been associated with their naturally fragmented distribution (archipelago-like), soil characteristics (shallow and poor in nutrients) and climatic oscillations of the past (Wendt, 1989). These characteristics have promoted the development of communities rich in species, with high levels of endemism and a unique physiognomy, structure and floristic composition (Brewer et al., 2003).

In Mexico, the Neotropical genus Stenanona Standl. of the family Annonaceae is particularly diverse and half of its species are restricted to the karst forests of this country, specifically to the Uxpanapa-Chimalapas region in Veracruz, the Sierra el Madrigal in Tabasco, and the Ocote area in Chiapas (Schatz and Wendt, 2004; Schatz and Maas, 2010; Ortiz-Rodríguez et al., 2014, 2018b). This greater diversity of the genus in karst forests could be the result of numerous events of allopatric speciation, where the naturally fragmented distribution of these forests and the dynamics in the time of isolation between islands of vegetation has promoted the disjunction between populations with different levels of morphological and genetic divergence (Wendt, 1989; Ortiz-Rodriguez et al., 2018b).

Here we describe a new species of Stenanona endemic to the karst forests of Chiapas, Mexico. The species can be distinguished from the other species of Stenanona based on its vegetative and reproductive characteristics, even exhibiting morphological characteristics not previously described for the genus. Like the other Mexican species of Stenanona, the new species presented here has a very restricted and allopatric distribution range. This discovery arises as a result of recent botanical explorations in little known karst regions in the highlands of northern Chiapas.

Material and Methods

The new species was recognized using the unique combination of features criteria (Donoghue, 1985) through comparisons with morphologically similar species and literature review. We visited and examined the specimens of Desmopsis Saff. and Stenanona deposited in the CHIP, HEM, MEXU and XAL herbaria (acronyms follow Thiers, 2019). Additionally, we consulted the digitized type specimens available at JSTOR Global Plants (JSTOR, 2019).

Based on the only known localities for the species, we assessed its conservation status by calculating its extent of occurrence (EOO) and its area of occupancy (AOO) using the GeoCAT tool (Bachman et al., 2011) and applying the IUCN Red List Categories and criteria (IUCN, 2011).

Results

Taxonomy

Stenanona morenoi Ortíz-Rodr. & Moreno-Méndez, sp. nov., Figs. 1-3.

Figure 1: Stenanona morenoi Ortíz-Rodr. & Moreno-Méndez. A. branchlet; B. inflorescences borne on leafless portions of branches; C. velvety fruit Surface; D. fruit inside; E. seed. Drawn by Lizbeth Pérez Lucas from the type (A) and from G. Moreno Méndez 177 (B-E). 

Figure 2: Photos of Stenanona morenoi Ortíz-Rodr. & Moreno-Méndez in vivo. A. habit; B. bark; C. branchlet; D. inflorescences and flowers (note the red blotch at the base inside); E. inflorescences borne on leafless portions of branches; F. young fruits borne on leafless portions of branches; G. velvety fruit. Photos by Gaspar Moreno-Méndez. 

Figure 3: Distribution of Stenanona morenoi Ortíz-Rodr. & Moreno-Méndez, Stenanona migueliana Ortíz-Rodr. & G.E. Schatz, Stenanona stenopetala (Donn. Sm.) G.E. Schatz and Stenanona zoque Ortíz-Rodr. & Gómez-Domínguez, based on georeferenced localities available at the Global Biodiversity Information Facility (GBIF. 2019a; GBIF. 2019b) and supplemented with field records. 

TYPE: MEXICO. Chiapas, municipio Chilón, ejido San Jerónimo, 1.42 km al sur de la comunidad Jol Cacuala, camino al predio de Don Jerónimo Moreno, 1520 m, 17°03'04"N, 92°04'35"W, 03.VII.2019, G. Moreno Méndez 87 (holotype: HEM!, isotypes: MEXU!, MO!, NY!).

Stenanona morenoi is similar to S. migueliana Ortíz-Rodr. & G.E. Schatz, S. stenopetala (Donn. Sm.) G.E. Schatz and S. zoque Ortíz-Rodr. & Gómez-Domínguez, but it can be distinguished from these three species by the combination of 2 or 4-flowered inflorescences, partially fused sepals, cream to light yellow flowers with a red blotch at the base of the inner petals, numerous ovules per carpel and surface of the monocarps completely covered with short, golden-brown, erect hairs, resulting in a velvety texture.

Trees 10-20 m tall, 28 cm diameter; young twigs, buds and petiole densely covered with appressed, golden-brown hairs; leaves distichous, oblong-elliptic, chartaceous, punctate with minute lens-like warts, 8-24 cm long, 3-8 cm broad, base obtuse to acute, apex acute to short acuminate, margins slightly revolute, upper side of leaves shiny and glabrous, lower side of leaves very sparsely covered with appressed, golden-brown hairs to glabrous; venation weakly brochidodromous with 8-14 lateral veins/side, midrib impressed above, raised below, densely covered with appressed hairs; petiole 5-10 mm long, ~2 mm diameter, canaliculate; inflorescence borne on leafless portions of old branches (ramiflory), 2 or 4-flowered, pedicels and outer side of bracts densely to rather densely covered with appressed and erect, golden-brown hairs; peduncles minute; pedicels arise from a condensed short shoot, 18-45 mm long, 2-2.5 mm diameter in vivo (1-1.5 in sicco, up to 3 mm diameter in fruit), pendent, with a tiny basal bract; sepals 3, partially fused at the base, broadly ovate, 2-3 mm long, 2-3 mm broad, base truncate, apex acute, externally densely covered with golden-brown appressed hairs, sparsely covered with golden-brown appressed hairs inside, sepals persistent in young fruits; petals 6, free, linear to linear-triangular, in two sub-equal whorls, cream to light yellow at anthesis with a red blotch at the base of the inner petals, 23-60 mm long, 1-3 mm broad, base rounded to truncate, apex acute to aristate, densely covered with golden-brown appressed hairs externally, sparsely covered with golden-brown appressed hairs to glabrous inside; stamens ~80, 1.2-1.8 mm long, apical part of connective expanded above the thecae, truncate discoid or slightly prolonged toward the gynoecium, sparsely covered with erect golden-brown hairs; carpels 3-6, ~2.5 mm long, stigma globose to reniform, ovary prismatic to pear-shaped, densely covered with appressed and erect golden-brown appressed hairs, ovules 9-12, uniseriate; monocarps 1-4, globose to ellipsoid, 55-60 mm long, 45-50 mm broad, surface completely covered with short golden-brown erect hairs (velvety), stipes 4-6 mm long, ca. 10 mm diameter, fleshy mesocarp, granular when dry; seeds 6-8, wedge-shaped to depressed globose, 22-25 × 12-14 ×7-11 mm.

Etymology: the specific epithet honors Manuel Moreno Demeza for his extraordinary work in favor of forest conservation in northern Chiapas.

Distribution and ecology: the species is only known from the karstic type locality in the highlands of northern Chiapas (more than 1000 m a.s.l., Fig. 3), where contrary to other karstic regions of southern Mexico, organic matter in the soil is very abundant and covers large part of the limestone rocks. Stenanona morenoi is part of the upper strata and is associated with species as Quercus paxtalensis C.H. Mull., Garcinia intermedia (Pittier) Hammel, Quararibea funebris (La Llave) Vischer, and Guarea glabra Vahl. Frequently the stems of S. morenoi are so long that they lie on other trees for support (also observed in S. stenopetala but not in other species of Stenanona). During the morning, the flowers of S. morenoi release a fruity aroma, but no flower visitors were observed.

Conservation status: We currently lack the necessary information to assess definitively the conservation status of Stenanona morenoi. However, according to the criteria established by the IUCN (2011), it is possible to tentatively determine that the species is Critically Endangered (CR B1ab (iii)). Its estimated area of occupancy (AOO) is 8 km² and extent of occurrence (EOO) is 0 km². Although it is likely that the small number of georeferenced data results in an underestimation of its EOO, at the type locality the species was found into two nearby patches of forest isolated from each other by corn crops. Furthermore, the species appears to be extremely rare. In one of the patches only five individuals were counted, while in the other site only eight were observed.

Additional specimens examined: MEXICO. Chiapas, municipio Chilón, ejido San Jerónimo, 1.42 km al sur de la comunidad Jol Cacuala, camino al predio de Don Jerónimo Moreno, 1360 m, 17°03'35"N, 92°06'09"W, 09.VII.2019, G. Moreno Méndez 177 (HEM, MEXU).

Discussion

Extraordinary plants and where to find them

Based on its general floral morphology, Stenanona morenoi is placed within subclade A of the Desmopsis-Stenanona clade (Ortiz-Rodriguez et al., 2018a). Within this lineage, S. morenoi is related to Stenanona migueliana, S. stenopetala and S. zoque (here named the Stenanona stenopetala group, Table 1). The four species are medium to large sized trees (7-25 m tall) and share the cauliflorous/ramiflorous inflorescences and the long-pedicellate flowers with six free, sub-equal, linear to linear-triangular petals (Ortiz-Rodriguez et al., 2014; 2018b). These shared characteristics (synapomorphies) among the members of the Stenanona stenopetala group contrast with those present in the type species of the genus (Standley, 1929; Fries, 1931), with which they are not phylogenetically related (Ortiz-Rodriguez et al., 2016; 2018a). The type species, Stenanona panamensis Standl., is a small sized tree with short pedicellate flowers, partially fused petals and long sepals with obvious venation in vivo, none of these features shared with members of the Stenanona stenopetala group (Schatz and Maas, 2010; Ortiz-Rodriguez et al., 2014; 2018b). Members of this group are distributed in the north of Mesoamerica and are restricted to the karst areas of the region. The four species have a very restricted distribution range and occur allopatrically (Ortiz-Rodriguez et al., 2018b, Fig. 3). Within the genus Stenanona the species distributed in Guatemala and Mexico occur within this biome and tend to be phylogenetically related (Ortiz-Rodriguez et al., 2016; 2018a), and based on their different levels of morphological and genetic variation, it is possible to hypothesize that karst areas have played a very important role in the evolutionary history of this genus in Mesoamerica.

Table 1: Morphological features of Stenanona morenoi Ortiz-Rodr. & Moreno-Méndez compared with its close relatives. 

Species
Features Stenanona migueliana Ortíz-Rodr. & G.E. Schatz Stenanona morenoi Ortíz-Rodr. & Moreno-Méndez Stenanona stenopetala (Donn. Sm.) G.E. Schatz Stenanona zoqueOrtíz-Rodr. & Gómez-Domínguez
Inflorescence Cauliflory Ramiflory Cauliflory Cauliflory
Number of flowers per inflorescence 1 or 2 2 to 4 1 or 2 1 or 2
Color of petals Salmon-pink Cream to light yellow Salmon-pink Yellow
Inner sepals surface Glabrous Sparsely pubescent inside Glabrous Glabrous
Sepals fused No Yes No No
Number of carpels 9-11 3-6 6-16 6-10
Ovules per carpel 8-11 9-12 6-8 6-9
Ovule arrangement Biseriate Uniseriate Uniseriate Biseriate
Fruit surface Verrucate, sparsely covered with golden brown, erect and appressed hairs Smooth, completely covered with short golden-brown erect hairs (velvety) Smooth, sparsely covered with golden brown, erect and appressed hairs Not seen

Among the members of the group, S. morenoi is well differentiated based on its vegetative and reproductive characteristics (Ortiz-Rodriguez et al., 2018b; Figs. 1, 2, Table 1). The partially fused sepals of S. morenoi are not shared with other species of the Stenanona stenopetala group, but are common in other species of Stenanona such as S. carrillensis G.E. Schatz & Maas, S. cauliflora (J.W. Walker) G.E. Schatz and S. hondurensis G.E. Schatz, F.G. Coe & Maas (here named the Stenanona cauliflora group). However, members of the Stenanona cauliflora group are invariably tetramerous and have many carpels with few ovules each (Schatz and Maas, 2010). Interestingly, fruits characteristics of S. morenoi (Figs. 1, 2) are absent in the other species of Stenanona (Schatz and Maas, 2010). Its velvety fruits are rather similar to those present in some species of Sapranthus Seem. (Schatz et al., 2018) and in Tridimeris hahniana Baill., but its floral characteristics are very different from those of these genera.

Besides the features mentioned, another attribute that distinguishes S. morenoi from its congeners is its distribution at higher altitudes. The new species inhabits within a tropical karst forest between 1300 and 1500 m a.s.l., while most species of Stenanona occur between 200 and 1000 m a.s.l. (Schatz and Maas, 2010; Ortiz-Rodriguez et al., 2014, 2018b).

Acknowledgements

We extend our sincere gratitude to Lizbeth Pérez Lucas for the illustration, Yuyini Licona Vera and Julio César Montero Rojas for the map and Juan Francisco Ornelas for preparing figures 1 and 2. We thank Marie-Stéphanie Samain and two anonymous reviewers for helpful comments on previous versions of the manuscript.

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Author contributions

GMM led the fieldwork and collected the species, AEOR reviewed the literature and herbarium specimens, conducted the species description and wrote the manuscript. Both authors reviewed the manuscript and prepared the final version.

Funding

This study was carried out using personal/private funds.

Recebido: 15 de Outubro de 2019; Revisado: 14 de Novembro de 2019; Aceito: 29 de Novembro de 2019

3Author for correspondence: ortizrodriguez.ae@gmail.com

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