Andinia tingomariana A.Diaz & MarkWilson, 2018

Hernández, Alex Gustavo Diaz, Horna, Luis Antonio Ocupa, Godo, Luis Enrique Yupanqui & Wilson, Mark, 2018, A new species of Andinia (Orchidaceae, Pleurothallidinae) from Huánuco, Peru, and the first Peruvian locality for Andinia schizopogon, Phytotaxa 361 (2), pp. 222-232 : 223-227

Andinia tingomariana A.Diaz & MarkWilson , sp. nov. ( Figs. 1 – 5 )

Type: — PERU. Huánuco: Tingo María National Park, districts of Mariano Dámaso Beraun and Rupa Rupa of the Province of Leoncio Prado of the Huánuco Region, Peru, S9.34238° W76.00451°, 1285 m, 12 March 2017, Diaz, Ocupa & Yupanqui (holotype: HUT!).

Andinia tingomariana is distinguished from the most closely related species, A. dielsii , by a number of attributes, including a smooth ovary versus echinate in A. dielsii , unguiculate, reniform, ciliate petals versus narrowly linear, non-ciliate in A. dielsii ; a longer column ~ 2.5 mm versus ~ 2 mm in A. dielsii , an undilated column apex versus dilated into a flattened, ovate extension in A. dielsii and attachment to the lip on terminal third of the column versus half-way in A. dielsii .

Epiphytic herbs, 4.0 – 7.5 cm tall. Rhizome 2 – 3 mm between ramicauls. Ramicaul abbreviated, 12 – 21 × 2 – 4 mm, enclosed by 1 or 2 tubular, ribbed sheaths. Leaf conduplicate, erect, oblong to subacute, smooth, the base cuneate, trinervate, and apex minutely tridentate, petiole 2 – 3 mm long. Inflorescence successively several 1 – 6-flowered, arching, raceme to 3 cm long, floral bracts oblique, acuminate, 1 mm long; pedicels 2 mm long. Ovary smooth, furrowed, 1.20 × 0.65 mm; sepals yellow to orange, intensifying towards apices becoming violet, margins irregularly ciliate, carinate, triveined, dorsal sepal elliptic, concave, slightly acuminate, 5.0 × 1.5 mm, lateral sepals free, oblique, flat, 5.0 × 1.4 mm, apices acute, acuminate; petals yellow to orange, bilobed, reniform, unguiculate, obtuse, long cilia, 1.2 × 1.0 mm; lip violaceous reddish, trilobed, reniform, triveined, 4.0 × 1.5 mm, finely ciliate, slightly expanded in the centre, geniculate, apex rounded, surrounding the column, to which it joins adaxially in the outer third with a thin ciliate claw. Column orange-purple, terete, minutely ciliate, 2.5 mm long, slightly dilated apically, anther subapical, stigma subapical, bilobed; capsule not observed.

Etymology:— Named for the type locality in Parque Nacional Tingo María, Huánuco, Peru ( Fig. 5 ).

Distribution and habitat:— To date, A. tingomariana has only been observed in this one location, a mountain range running longitudinally north-south through Tingo María National Park. Andinia tingomariana was observed growing epiphytically among mosses and Selaginella on tree trunks and vines ( Figs. 3–4 ). in a humid forest exposed to moisture-laden winds at an elevation of 1285 m in the same habitat as Cranichis muscosa Swartz (1788: 120) and Masdevallia concinna Königer (1982: 101) .

Conservation status:— Although the type locality of Andinia tingomariana is in a protected area, Tingo María National Park, the limited number of plants observed and distribution suggest that it may be vulnerable. However, until further information on distribution and abundance can be collected it should be listed as Data Deficient according to IUCN criteria.

Figures

FIGURE 1. Andinia tingomariana. A. Ovary, column and labellum. B. Whole flower (partial side view). C. Whole plant. D. Corolla. E. Labellum. Drawn from material used to prepare the holotype by Alex Diaz.

FIGURE 2. Andinia tingomariana. A. Partial side view. B. Lateral view. C. Rear view. Photographs by Alex Diaz.

FIGURE 3. Andinia tingomariana in situ on a liana. Photograph by Alex Diaz.

FIGURE 4. Andinia tingomariana in situ with mosses and Selaginella. Photographs by Alex Diaz.

FIGURE 5. Type locality of Andinia tingomariana (red star) in Tingo María National Park (hatched), Huánuco, Peru.