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Research Article
A new species of Heliconia (Heliconiaceae) with pendent inflorescence, from Chucantí Private Nature Reserve, eastern Panama
expand article infoRodolfo Flores, Carla Black§, Alicia Ibáñez|
‡ Universidad Autónoma de Chiriquí, Chiriquí, Panama
§ Unaffiliated, Chiriquí, Panama
| Unaffiliated, Balboa, Panama
Open Access

Abstract

Heliconia berguidoi (Heliconiaceae), a new species from premontane forest of eastern Panama, is described, illustrated and its conservation status evaluated. H. berguidoi bears pink flowers, an uncommon color in this group. It differs from the Colombian species Heliconia rhodantha and Heliconia sanctae-theresae, the most similar taxa, by the combination of a petiole glabrous except for the woolly base, a very long peduncle, the perianth pubescent at the apex and staminode with cuspidate apex. H. berguidoi is also similar to Heliconia pogonantha in all four of its varieties and to Heliconia ramonensis in two of its four varieties, but differs by a combination of the long peduncle, pink flowers and staminode with cuspidate apex. Fifty-six Heliconia species have been found in Panama, eighteen of them endemic.

Resumen

Heliconia berguidoi (Heliconiaceae), una nueva especie de bosque premontano del este de Panamá, es descrita, ilustrada y su estado de conservación evaluado. H. berguidoi tiene flores rosadas, color poco común en este grupo. Difiere de las especies de Colombia Heliconia rhodantha y Heliconia sanctae-theresae, taxones más similares, por la combinación de un pecíolo glabro aunque lanudo en la base, pedúnculo muy largo, ápice del perianto pubescente y estaminoide con el ápice cuspidado. H. berguidoi es también similar a Heliconia pogonantha en sus cuatro variedades y a Heliconia ramonensis en dos de sus cuatro variedades, pero difiere por la combinación de su largo pedúnculo, el color rosado de las flores y el estaminoide con ápice cuspidado. En Panamá se han encontrado cincuenta y seis especies de Heliconia, dieciocho de ellas endémicas.

Keywords

Barbatae, Cerro Chucantí, Griggsia, Heliconia, Heliconiaceae, Serranía de Majé, Zingiberales

Palabras claves

Barbatae, Cerro Chucantí, Griggsia, Heliconia, Heliconiaceae, Serranía de Majé, Zingiberales

Introduction

Heliconia L. is the only genus in the plant family Heliconiaceae, which is included in the order Zingiberales (Berry and Kress 1991, APG IV 2016). This family is native to tropical America (Caribbean islands, Mexico, Central America and South America) with a small number of species in the Old World tropics, distributed from Samoa, westward to the central Indonesian island of Sulawesi (Kress 1984, Kress 1990b, Berry and Kress 1991). Heliconia has been formally and informally divided into five subgenera: Taeniostrobus (Kuntze) Griggs, Heliconia, Stenochlamys Baker, Griggsia L.Andersson and Heliconiopsis (Miq.) Kress (Andersson 1985, 1992; Kress 1984, 1990a).

The total number of Heliconia species is still unclear, although in a recent account Ferreira de Castro et al. (2007) registered 176 for the Neotropical region and 6 in the Pacific islands, for a total of 182 species distributed in five (5) subgenera and twenty-three (23) sections. Kress and Betancur (2009) recently described one more new species from Colombia which makes a total of 183 recognized species. In Panama, 55 Heliconia species and infraspecific taxa have been reported and the country has the third largest number of endemics (17), after Colombia (36) and Ecuador (21) (Kress 2003, Correa et al. 2004, Ferreira de Castro et al. 2007, Tropicos 2016).

The new Heliconia berguidoi has been found in the premontane forests of Chucantí Private Nature Reserve, at around 800 m, in disturbed and mature forest. Seven other Heliconia species occur in the area: H. latispatha Benth., H. pogonantha Cufod., H. metallica Planch. & Linden ex Hook., H. nutans Woodson, H. wagneriana Petersen, H. platystachys Baker and H. spathocircinata Aristeg.

Chucantí Private Nature Reserve (404 hectares) is located on the border of Panama and Darién Provinces, on the eastern edge of Serranía de Majé, an isolated mountain range about 60 km long. It is 30 km south of the continental divide across the valley of the Bayano River and 15 km inland from the Pacific (Figure 1). The range rises gradually towards the east, with the highest point, Cerro Chucantí (1,439 m) at the eastern end (BirdLife International 2016). The reserve, which extends from around 800 m to the highest summit, harbors premontane and lower montane rain forests (Holdridge et al. 1971). According to the ecoregion classification system (WWF 2016), Chucantí is part of the Eastern Panamanian montane forests ecoregion. It has been designated an Important Bird Area (IBA) in Danger (Angehr 2003), as the extensive loss of forests due to cattle ranching activities is putting in peril the existence of several endemic bird species.

Figure 1.

Elevation map of Panama with location of Chucantí Private Forest Reserve.

As part of a floristic inventory of the region carried out by two of the authors (Flores and Ibáñez, unpublished), ca. 250 species have been identified from more than 500 collections. At least 6 of them have been recognized as species new to science (Ortiz et al. 2016; Flores et al., submitted; Valdespino et al. in prep.), including the new Heliconia described here. Endemic species of fauna have also been recently described from the area (Batista et al. 2014, Bezark et al. 2013, Miranda and Bermúdez 2010). All of these novelties highlight the importance for conservation of this undercollected region of Panama. Discovering, describing and conserving biodiversity is the purpose of the Asociación Adopta el Bosque Panamá, owner of the Chucantí Private Nature reserve.

Materials and methods

One live plant of H. berguidoi was collected in Chucantí Private Nature Reserve (2006) and was grown at Finca las Chichicas (Chiriquí Province). Ten years later, a specimen from the original plant was photographed, studied under cultivation, collected, illustrated and deposited at the Herbarium of the University of Panama (PMA). Some flowers and fruits were stored in 70% ethanol and studied using a stereomicroscope.

In March 2011, a specimen of H. berguidoi was collected in Chucantí Private Nature Reserve as part of a general floristic inventory of the area.

Each type specimen of subgenus Griggsia L.Andersson was reviewed in the JSTOR Global Plants webpage (JSTOR 2016). Some specimens of those species deposited in PMA Herbarium were also reviewed. Maps were made with the program ArcGIS version 10.1. The IUCN Red List Categories and Criteria (IUCN 2012) was used to determine the conservation status of the new species.

Taxonomic treatment

Heliconia berguidoi R.Flores, C.Black & A.Ibáñez, sp. nov.

Figs 2, 3, 4

Diagnosis

This species is distinguished from other species of Heliconia by the combination of the long petioles (up to 180 cm), glabrous but woolly at the base; blade splitting into narrow lateral segments; peduncle red, woolly with golden hairs, very long (125-150 cm); slightly flexuous rachis; bracts spirally arranged; pink flowers, perianth pubescent at the apex and staminode with cuspidate apex.

Type

PANAMÁ. Provincia de Darién: Reserva privada Chucantí, Sendero al filo (roca grande). Bosque premontano. 900 m. 8°47'33.46"N, 78°27'6.72"W, 26 agosto 2006, individuo colectado por Carla Black. Floreció en cultivo el 12 de marzo de 2016, Finca las Chichicas, corregimiento de Volcán, distrito de Bugaba, Provincia de Chiriquí. Col. R. Flores, O. Ortiz y C. Black, 3855 RF (Holotype PMA!, Isotype, MO!, SEL!, UCH!, US!).

Description

Herb with Musa-like habit, 4.5–5 m tall, leafy shoots to 5 stems per group. Pseudostem green with brown lenticular spots, 160–180 cm tall, 6.5–7.5 cm in diameter; sheath glabrous but woolly on the margin. Leaves 4 per shoot, held more or less in horizontal position; petiole green, glabrous, woolly at the base, ca. 180 cm long, 2 cm in diameter; symmetrical blades splitting into narrow lateral segments with the base truncate, unequal, splitting into narrow lateral segments, apex acuminate, the upper surface green, midrib light green and glabrous, the lower surface light green, midrib green-reddish, glabrous, the largest blades up to 160 cm long and ca. 48 cm wide (Figures 2A, 4A, C).

Figure 2.

A Habit of Heliconia berguidoi B Inflorescences touching the ground C Plant with two of the authors (R. Flores and C. Black). Photos: A, C – R. Flores; B – C. Black.

Inflorescence pendent, up to 220 cm long; peduncle red, woolly with golden hairs, 125–150 cm long, 2 cm in diameter; rachis red, slightly flexuous, velutinous with golden hairs, 1.5 cm in diameter at the base (Figures 2, 4B).

Cincinnal bracts spirally arranged, ca. 25 per inflorescence, oriented ca. 120° to axis of the inflorescence, normally a sterile bract inserted in the peduncle, basal bracts separated ca. 3 cm and 1.5 cm between terminal bracts, the basal bract more elongated, outer surface pink at the base, turning red at the apex, totally velutinous with golden hairs, inner surface whitish, glabrous at the base with a few grouped hairs on both sides of the base, pink and hirsutulous with golden hairs at the margins and in the middle of the bract, ca. 12 cm long, ca. 5 cm wide at the base, l/w= 2.4 (Figures 3A, 4D).

Figure 3.

A Inflorescence segment of H. berguidoi B Cincinnal bracts opened, showing floral bracts C Flower. Photos: A – R. Flores; B, C – C. Black.

Floral bracts persistent, 4.2–5.5 cm long, 1.5–2.6 cm wide at the base, pink, carinate, base of the abaxial surface glabrous to slightly tomentose at the apex, adaxial surface slightly tomentose at the base, inner surface glabrous (Figures 3B, 4F).

Flowers (5-)11–21 per cincinnus; pedicel pink, white at the base, pubescent, 12–20 mm long; ovary 10–11 mm long, 5 mm in diameter, lavender, glabrous; perianth 4.5–5.5 cm long, 0.6-0.8 cm in diameter, at anthesis curved 80° and sigmoid, slightly pink at the base, dark pink at the apex, glabrous except for pubescence at the apex of the perianth; free sepal reflexed, fused sepals with apices reflexed (Figures 3C, 4E); staminode 7.0–7.5 by 2.5–3.0 mm, white, fused to the perianth tube 12 mm above the base, elliptic with cuspidate apex (Figure 4G); stamens with anthers connivent and inside corolla apex. Drupes glabrous, bright blue 10–14 mm long, 9 mm wide.

Figure 4.

Heliconia berguidoi R.Flores, C.Black & A.Ibáñez. A Habit B Inflorescence C Leaf D Cincinnal bract open and flowers E Flower F Flower bract G Staminode.

Distribution, habitat and ecology

Heliconia berguidoi is endemic to the Serranía de Majé, eastern Panama. It is known only from the Chucantí Private Nature Reserve (Figure 1), where it inhabits premontane forest at ca. 800 m. The canopy in this area attains a height of 20–35 m; some common canopy species are Oreomunnea pterocarpa, Ocotea sp. nov. ined., Magnolia sp. nov. ined., Quercus humboldtii, Podocarpus guatemalensis and Peltogyne purpurea. One population of H. berguidoi has been found growing in early secondary forest regenerating from previous clearance or treefall gaps. It also appears in mature forest. Mature flowers were collected in situ in March, while ex situ the species seems to flower all year round. Mature fruits have not been collected in situ. Ex situ they appear all year round.

Conservation status

Heliconia berguidoi is known only from one population in the type locality, Chucantí Private Nature Reserve. Human activities such as agriculture, cattle ranching and logging are the main threats to other populations of this species that probably exist in the forests around the reserve. These areas belong to farmers engaged in the activities mentioned above or else are public lands prone to colonization. Because of the restricted area of occupancy (AOO) estimated at 4 sq. km, and the severe threats, we consider that H. berguidoi fits the category of Critically Endangered [CR B2ab (ii, iii, iv)] of the IUCN Red List and criteria (IUCN 2012).

Etymology

The specific epithet, berguidoi, honors the Panamanian biologist Guido Cesar Berguido F., who first brought national attention to Cerro Chucantí after witnessing not only its natural splendor, but the rampant ongoing deforestation. He mustered support from family and friends to purchase a property and set it aside for conservation before the previous owners could burn the forest to ashes. He received further private support and acquired more lands to create the Chucantí Private Nature Reserve. Mr. Berguido continues to invite fellow biologists to study the flora and fauna of Cerro Chucantí, which has resulted in the discovery of various species new to science. He recently founded the Asociación Adopta el Bosque Panamá, Adopt a Panama Rainforest, ADOPTA (www.chucanti.org) to further his conservation mission. It is an honor to thus recognize Mr. Berguido´s contributions to increased biological knowledge and his great efforts to conserve the unique forests of Cerro Chucantí. His generous logistical assistance to the authors was invaluable.

Paratypes

PANAMÁ. Provincia de Darién. Cerro Chucantí, 800 m, 8°47'15.84"N, 78°27'13.57"W, 3 marzo 2011, fl., R. Flores & K. Morales. 595 RF (PMA!).

Discussion

The new species of Heliconia described here belongs to the section Barbatae J.Kress ined., characterized by having the inflorescence, parts of it and/or the flowers densely pubescent with colored hairs (Kress et al. 1999, Kress and Betancur 2009) and to subgenus Griggsia L.Andersson characterized by a pendent inflorescence (Kress 1990a). It is the first species of both subgenus and section found in Panama with pink flowers and very long peduncle, which occasionally makes the inflorescence touch the ground. Very few species in the genus Heliconia have pink flowers.

It resembles the Colombian species Heliconia rhodantha and Heliconia sanctae-theresae in the pink flowers. Also, H. rhodantha is similar to H. berguidoi in the length and width of the leaf and the truncate and unequal leaf base. Nevertheless, the three species differ in several ways. H. berguidoi has petioles up to 180 cm long with a woolly base vs. petioles that do not exceed 110 cm long and totally glabrous in H. rhodantha, and up to 220 cm and totally glabrous in H. sanctae-theresae. Inflorescences of H. berguidoi reach 220 cm long with a wooly peduncle and a slightly flexuous, velutinous rachis; the cincinnal bracts are spirally arranged and velutinous with apex not early necrotic vs. inflorescences up to 135 cm long, pubescent, velvety peduncle and a flexuous, finely pubescent rachis; cincinnal bracts distichous and finely pubescent with apex early necrotic in H. rhodantha, and inflorescences up to 67 cm long, velvety peduncle, flexuous rachis and cincinnal bracts distichous in H. sanctae-theresae. The perianth of H. berguidoi is pubescent at the apex and the elliptic staminode has a cuspidate apex vs. perianth glabrous and staminode completely linear in H. rhodantha, and perianth finely pubescent and staminode ovolanceolate in H. sanctae-theresae.

H. berguidoi is similar to H. pogonantha in its four varieties, mainly in the habit: leaves held more or less in horizontal position, leaves with unequal bases, blade splitting in segments, cincinnal bracts spirally arranged and the apex of the perianth pubescent. Additionally, it is similar to one of the varieties of H. pogonantha (H. pogonantha var. pubescens) in the combination of usually woolly peduncles and the rachises and cincinnal bracts velutinous.

H. berguidoi differs clearly from H. pogonantha in its four varieties by the petioles woolly towards the base, leaf with acuminate apex, long peduncle (125–150 cm), slightly flexuous rachis, pink flowers and staminode with cuspidate apex vs. petioles glabrous, leaf with acute apex, shorter peduncle (10–60 cm), flexuous rachis, yellow flowers and staminode with acuminate apex in H. pogonantha. Additionally, the inflorescence is one-colored in H. berguidoi vs. two-colored in three of the four varieties of H. pogonantha.

With the combination of similar habit, blade splitting in segments, woolly peduncle, monochromatic cincinnal bracts and pubescent sepal apexes, H. berguidoi is very close to two of the four varieties of H. ramonensis (H. ramonensis var. ramonensis and H. ramonensis var. xanthotricha) but it is clearly differentiated by the longer peduncle (125–150 cm), slightly flexuous rachis and pink flowers vs. shorter peduncle (10–60 cm), flexuous rachis and yellow flowers.

With the description of H. berguidoi, fifty-six native Heliconia species grow in Panama, eighteen of them endemic. This new species adds to a total of 178 species in the Neotropical region and 184 worldwide.

Key to Panamanian Heliconia sect. Barbatae ined. with inclusion of H. rhodantha and H. sanctae-theresae, Colombian species. Based on Kress (1984) with modifications

1 Flowers pink, staminode totally linear, ovolanceolate or apex of staminode cuspidate.
2 Peduncle absent or to up 14 cm, staminode ovolanceoate H. sanctae-theresae
2' Peduncle 50–150 cm long, staminode linear or apex of staminode cuspidate.
3 Perianth pubescent at the apex, staminode with the apex cuspidate H. berguidoi
3' Perianth glabrous, staminode linear H. rhodantha
1' Flowers yellow, apex of staminode acuminate or cuspidate
4 Peduncle, rachis, and cincinnal bracts essentially glabrous.
4' Peduncle and rachis red or yellow, cincinnal bracts entirely red or red and yellow; floral bracts and perianth with golden hairs H. pogonantha
5 Peduncle, rachis, and cincinnal bracts rose-red; floral bracts and perianth with bright yellow hairs H. ramonensis
5' Peduncle, rachis, and/or cincinnal bracts densely velutinous to woolly.
6 Cincinnal bracts two-colored, red and yellow, velutinous H. pogonantha
6' Cincinnal bracts one-colored, not red and yellow, velutinous to woolly.
7 Inflorescence orange to rose-red, with orange hairs; perianth with orange or buff to rusty orange hairs.
8 Inflorescence pink to rose-red, with rusty orange hairs; perianth with rusty orange hairs H. ramonensis
8' Inflorescence orange-red with orange (fresh) or buff (dried) hairs H. danielsiana
7' lnflorescence burgundy with golden to burgundy hairs or yellow with yellow hairs; perianth with golden or yellow hairs.
9 Inflorescence deep red to burgundy, with golden to burgundy hairs; perianth with golden hairs H. magnifica
9' Inflorescence bright yellow-green with yellow hairs; perianth with bright yellow hairs H. xanthovillosa

Acknowledgements

The authors wish to thank the Ministerio de Ambiente (Ministry of Environment) for facilitating this research through issuing the collecting permits (SE/P-42-09, SC/P-20-12) and to Guido Berguido, who invited us to carry out a botanical survey in Chucantí. Thanks are due also to the Smithsonian Tropical Research Institute (STRI) for supporting logistical aspects of this work; to the US National Institutes of Health (NIH) for funding two of the authors (Flores & Ibáñez) through the International Cooperative Biodiversity Groups (ICBG) program, and to the staff of the University of Panama Herbarium (PMA). We would also like to thank Fermín Hernández, José Gudiño, Kelvin Morales, Melisa Ayala, Ángela Celis and Salvador Peris, who participated in the several field trips to the Chucantí Private Nature Reserve. Thanks to the artist Ruben Lozano for his excellent drawing of the specimen used for this article. Roy Maduro, Asociación Adopta el Bosque Panamá (ADOPTA)-Adopt a Panama Rainforest and Programa de Maestría en Biología Vegetal (UNACHI), generously provided funds for publication. We are very grateful to Gordon McPherson, Paul Maas, Gustavo Morales and W. J. Kress for their useful comments and suggestions.

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