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Drymonia squamosa (Gesneriaceae), una especie nueva del Parque Nacional Natural Las Orquideas (Antioquia, Colombia).

DRYMONIA SQUAMOSA (GESNERIACEAE), A NEW SPECIES FROM LAS ORQUIDEAS NATIONAL NATURAL PARK (ANTIOQUIA, COLOMBIA)

INTRODUCTION

The northern Andes is one of the most diverse regions on Earth (Mittermeier et al. 2005), and harbors the highest species richness of Gesneriaceae in the world. Colombia has the largest number of species of Gesneriaceae in the Neotropics (Kvist et al. 1998, Clavijo et al. 2015), and the largest number of species of Drymonia, which are especially diverse in the Andes with 28 of the 37 species found in the country (Clavijo et al. 2015). However, the Andes have suffered some of the highest deforestation rates because of anthropogenic pressures such as the conversion of forest to farmland (Mittermeier et al. 2005, Suarez et al. 2011). In Colombia, the deforestation rate in the Andes is high, with 0.67% of the native forest disappearing every year as a result, primarily, of the expansion of agriculture and pasture frontiers (Armenteras et al. 2011, Rodriguez et al. 2013). The declaration of protected areas in regions suffering rapid deforestation is important for the conservation of native flora, and has been successful in preserving natural ecosystems in the northern Andes where biological diversity is greatest (Joppa et al. 2008, Armenteras et al. 2009, Rodriguez et al. 2013). Additionally, research intended to document the diversity in these protected areas is urgently needed and fundamental for ongoing conservation efforts. Las Orquideas National Natural Park, located in the northwestern department of Antioquia, was created in 1974 with an area of 29.784 ha to preserve the forests in the Andean and Choco Biogegraphic region, which are two of the most diverse regions in the world. The inventory of the flora in Las Orquideas (Pedraza-Penalosa & Betancur 2014) has resulted in the discovery of several new species, some of them already published (Garzon & Gonzalez 2012, Garzon et al. 2012, Giraldo & Dalstrom, 2012, Szlachetko & Klonowska 2013, Smith et al. 2013, Amaya-Marquez 2014, Clavijo & Clark 2015, Croat et al. 2015, Pedraza-Penalosa 2015), and many others still in preparation (Pedraza-Penalosa pers. comm.).

Drymonia, with 74 species, is the third largest genus in the Neotropics, and one of the most morphologically diverse among the neotropical genera of the family Gesneriaceae (Weber 2004, Clark et al. 2006, 2015, Clavijo & Clark 2009). Extensive fieldwork, revision of herbarium collections, and molecular phylogenetic analyses have contributed to our current knowledge of the diversity and morphological variation of the genus. However, documenting the diversity of Drymonia is a task that is far from complete. There are numerous species that are new to science and many others that are only known from limited (i.e., one to few) localities that need to be studied and included in ongoing phylogenetic studies. Here, we describe a new species of Drymonia from Las Orquideas National Natural Park, increasing the number of species found in Colombia to 39 and the total number to 75. The description of D. squamosa is based on the study of herbarium specimens, and the terminology used in the description follows Harris & Harris (2001).

Drymonia squamosa Clavijo & J.L. Clark, sp. nov. (Figs. 1 & 2)

Type: COLOMBIA. Antioquia: Urrao, Parque Nacional Natural Las Orquideas, sector Calles, cerca de la Cabana de Parques, margen izquierdo del rio Calles, 6[grados] 31' 7.5" N, 76[grados] 15' 58.5" W, 1340 m, 7 Apr 2011 (fl, fr), J. Betancur et al. 15045 (holotype COL!, isotype NY!).

Drymonia squamosa differs from other species of Drymonia by dense clusters of scales on the petioles, glabrate leaf blades with minute punctations on the lower surface, calyx appearing swollen at base with lanceolate lobes, corolla villous to lanate, and style with glandular trichomes.

Hemiepiphytic, scandent or terrestrial shrub, 2.5-4.5 m tall. Stem erect to decumbent, branched, adventitious roots absent, subquadrangular in cross-section, 3.7-7.4 mm in diameter, surface papyraceous, glabrous, lenticels present, internodes 4.4-6.8 cm long. Leaves opposite, decussate, equal in a pair, evenly spaced; petiole 0.6-2.2 cm long, terete in cross-section, with a pair of glands at base of petiole, glabrous, covered with a dense clusters of scales (more evident when dry); blade ovate to elliptic, 9-27 x 5-12 cm, coriaceous, green adaxially, light green abaxially, apex acuminate, base cuneate to rounded, sometimes oblique, margin with scattered small teeth, glabrous adaxially, glabrate and with minute punctations abaxially, 4-5 pairs of main lateral veins, higher order of venation only evident abaxially. Inflorescence a reduced pair-flowered axillary cyme with 1-4 flowers; peduncle absent; bracts 3.5-6.5 x 0.5-1 mm, green to maroon, linear, apex acute, base truncate, margin entire, glabrate to strigillose. Pedicel erect or oblique relative to the stem, 10-23 mm long, green, rugose, scarcely pilose to pilose, with glands toward the apex. Calyx green during anthesis, then becoming green with pink margins and apex in fruit, swollen basally, membranous apically, only mid-vein conspicuous, with a pair of conspicuous glands at base, lobes fused at base for 3-14.5 mm; calyx lobes 5, 4 nearly equal and dorsal lobe slightly reduced, 26-40 x 8.4-16 mm, lanceolate, apex acuminate, margin serrate and recurved, abaxial surface punctate, strigose basally, strigillose apically, adaxial surface pubescent basally. Corolla zygomorphic, 4.5-5 cm long, oblique relative to calyx, protandrous, infundibuliform; base gibbous, 6-7 mm in diameter, gibbosity 4-5.5 mm long; tube 3.5-4 cm long, 0.8-1.6 cm wide, outer surface white, sometimes pink ventrally, villous to lanate, inner surface white to yellow, glabrate; throat 9.5-16 mm in diameter, inner surface with dark red or purple spots, glandular trichomes dorsally; corolla lobes 5, subequal, spreading, white, apex rounded, ventral lobe 16-17 x 12-14 mm, oblong, margin slightly erose, glabrous, lateral lobes 8-13 x 9-10 mm, ovate to oblong, margin slightly erose, lanate abaxially, glabrous adaxially, dorsal lobes 8-10 x 8-11 mm, ovate, margin entire. Androecium of 4 stamens, didynamous, filaments 30-32 mm long, adnate to the corolla tube for 15-17 mm, white, glabrous, coiling after anthesis; staminode absent; anthers sagittate, 5-6 x 2-3 mm, coherent by the lateral walls, dehiscence by basal pores that develop into longitudinal slits. Gynoecium with a single bilobed dorsal nectary gland, oblong, apex emarginate, 3-4 mm long, whitish, glabrous; ovary superior, 5-7 x 3-4 mm, ovate, strigillose; style 20-22 mm long, pilose, with regular and glandular trichomes, stigma stomatomorphic. Fruit a bivalved fleshy capsule, ovate, valves reflexed up to 90[grados], 19-25 x 10-15 mm, strigose and light green to yellow with pink margins abaxially, glabrous and purple adaxially; seeds numerous, immersed in a mass of fleshy funicular tissue forming a central cone, 1.2-1.7 mm long, 0.5-0.8 mm wide, black, elliptic, surface smooth.

Etymology. The species epithet refers to the squamate or densely clustered scalelike indument present in the petioles that is especially conspicuous when dry.

Distribution and habitat. Drymonia squamosa is endemic to Colombia and only known from Las Orquideas National Natural Park along the Pacific slopes of the Cordillera Occidental in the department of Antioquia, between 980 and 1340 m of elevation. D. squamosa has been collected only in well-preserved cloud forests.

Phenology. Flowers recorded from April to July, and fruit recorded in July.

Taxonomic affinities. Drymonia squamosa can be distinguished from the other species in the genus by the densely clustered scale-like indument on the petiole that is especially conspicuous when dry, the glabrate leaf blades with minute punctuations on the lower surface, the villous to lanate corolla, and the style with glandular trichomes. Drymonia squamosa and D. glandulosa Kriebel are similar in their habit, foliage, scale-like indument on the petiole, and the style with glandular trichomes. However, these two species can be differentiated by the following characters in Drymonia squamosa: petiole 0.6-2.2 cm long (vs. 3.5-6 cm long); blade with 4-5 pairs of main lateral veins (vs. 7-9), with minute punctuations abaxially (vs. absence of punctuations); calyx lobes lanceolate, 2.6-4 cm long (vs. oblong to ovate, 1.5-2.5 cm long); corolla villous to lanate, 4.5-5 cm long (vs. glabrate, 5.5-7 cm long), and throat white to yellow, suffused with dark red or purple spots (vs. purple). Drymonia glandulosa is endemic to northern Costa Rica and D. squamosa is endemic to the Pacific slopes of the Colombian Andes in the department of Antioquia.

[FIGURE 1 OMITTED]

[FIGURE 2 OMITTED]

Drymonia squamosa and D. alloplectoides Hanst. have similar flowers. However, D. squamosa is differentiated by the following characters: petiole with clustered scale-like indumentum (vs. smooth); blades 9-27 x 5-12 cm (vs. 3.8-11.3 x 1.8-5.4 cm); blade glabrate and with minute punctuations abaxially (vs. villous); stigma stomatomorphic (vs. bifid); fruit with valves reflexed up to 90[grados] (vs. 180[grados]), and seed surface smooth (vs. striated).

Conservation status. The only known populations of Drymonia squamosa are located in the protected area of Las Orquideas National Natural Park. The species has a restricted geographic distribution, small area of occupancy, and has only been collected from the type locality. Therefore, according to the IUCN Red List criteria (IUCN 2012) for restricted area of occupancy and number of locations (D2, area of occupancy less than 20 [km.sup.2], and known to exist at only a single location), D. squamosa should be listed in the category VU (Vulnerable).

Additional specimens examined: COLOMBIA. Antioquia: Frontino, Parque Nacional Natural Las Orquideas, sector Venados, vereda Venados Abajo, sitio La Miquera, 6[grados] 32' 23"- 6[grados] 32' 28" N, 76[grados] 17' 59"-76[grados] 18' 5" W, 1000-1030 m, 27 Jul 2011 (fl, fr), J. Betancur et al. 15465 (COL!, NY!); Urrao, Parque Nacional Natural Las Orquideas, vereda Cruces, sitio Pinares, camino a Perdidas, poco despues de la escuela La Esperanza, orilla izquierda del rio Calles, 6[grados] 28' 35.5" N, 76[grados] 19' 39.5" W, 980 m, 3 May 2013 (fl), S.E. Hoyos-Gomez et al. 2278 (COL!, NY!, UNA!).

doi: http://dx.doi.org/10.15446/caldasia.v37n2.54374

LAURA CLAVIJO

Department of Biological Sciences, The University of Alabama, Box 870345, Tuscaloosa, Alabama 35487 USA. lauriclav@gmail.com

JOHN L. CLARK

Science Department, The Lawrenceville School, 2500Main Street, Lawrenceville, New Jersey, 08648 USA. jlc@lawrenceville.org

ACKNOWLEDGMENTS

We thank Paola Pedraza-Penalosa (NY), Julio Betancur (COL) and Mateo Jaimes (COL) for providing access to the collections, Sue Blackshear for the illustration, and Julio Betancur for suggesting the specific epithet. Images were provided by Julio Betancur (Fig. 2A) and Saul Hoyos-Gomez (Fig. 2D). We are grateful to four anonymous reviewers for their useful comments that improved the manuscript. Drymonia squamosa was collected as part of the project "Flora of Las Orquideas National Park" funded by the National Science Foundation (DEB 1020623) to Paola Pedraza-Penalosa.

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Recibido: 13/07/2015

Aceptado: 22/11/2015
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Author:Clavijo, Laura; Clark, John L.
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Date:Jul 1, 2015
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