Pachyptera linearis Francisco & L.G.Lohmann, 2018

Francisco, Jessica Nayara Carvalho & Lohmann, Lucia G., 2018, Taxonomic revision of Pachyptera (Bignonieae, Bignoniaceae), PhytoKeys 92, pp. 89-131 : 112-114

5. Pachyptera linearis Francisco & L.G.Lohmann sp. nov. Fig. 13

Type.

Colombia. Meta: Parque Nacional Natural Tinigua, Serrania Chamusa Centro de Investigación Primatologicas La Macarena, 120 m, Apr 1992, fr., P. Stevenson 403 (holotype: MO088944!; isotypes, COL000349706!, COAH21210, not seen).

Diagnosis.

Pachyptera linearis is similar to Pachyptera kerere , but can be distinguished by the linear and flattened capsule (vs. the fusiform and inflated capsule of P. kerere ), inconspicuous longitudinal midline on each valve (vs. conspicuous and raised longitudinal midline on each valve of P. kerere ) and thin, oblong and wingless seeds (vs. corky, irregularly circular, obcordate and wingless seeds of P. kerere ).

Description.

Liana; stems solid, tetragonal (cylindrical in younger portions), with greyish striations, lenticellate; prophylls of axillary buds 3-seriated, flattened and ensiform. Leaves with blades discolorous or concolor, membranaceous to chartaceous, elliptic, obovate-lanceolate, asymmetric, apex acute, acuminate, base cordate, lateral blades 6.0-12.4 × 3.0-4.9 cm, apical blades 8.0-14.7 × 3.4-6.0 cm; petiole semi-cylindrical, 1.0-4.2 cm long, petiolules not puvinated, lateral petiolules 0.5-1.6 cm long, apical petiolules 1.5-3.5 cm long. Inflorescence a congested raceme, 0.6-1.2 cm long; pedicel ca. 0.8 cm long; bracts ca. 0.7 mm long; bracteoles cymbiform, ca. 0.7 mm. Calyx green, tubular, minutely 5-lobed, 0.9 × 0.8 cm. Corolla white, infundibuliform, ca. 6.7 cm long, ca. 1.4 cm of diameter at the tube mouth; lobes rounded, 0.8 × 0.9 cm. Androecium with the longer stamens ca. 32.0 mm long, the shorter stamens ca. 10.9 mm long, glabrous; anthers villous, included, thecae curved forward, 2.5 × 0.9 mm; pollen 3-colpate, microreticulate. Gynoecium 5.0-5.2 cm long; ovary 2.9-4.0 × 1.2 mm, cylindrical, not-sulcate, smooth, sparsely to moderately pubescent, with simple trichomes, sparsely lepidote, with glandular peltate trichomes, without patelliform glandular trichomes; stigma capitate or ovate, 1.7-2.8 × 1.7-2.8 mm; nectar disc 1.8 × 2.0 mm. Capsule linear, flattened, 19.0-35.0 × 2.2-2.4 cm, each valve with an inconspicuous longitudinal midline; seeds oblong, 4.0-7.0 × 1.5-1.8 cm, thin, not-corky, coriaceous to woody, striated, secondary sculpture regularly interrupted by lateral rays, wingless, with short membranaceous or chartaceous and hyaline wings.

Distribution.

Pachyptera linearis is only known from wet forests of Venezuela (Apure, Bolívar) and Colombia (Meta). Fig. 14 .

Phenology.

Pachyptera linearis flowers in January and fruits in April.

Etymology.

The epithet linearis makes reference to the linear fruit.

Nomenclatural note.

Pachyptera linearis is a new species described here based on new morphological and molecular phylogenetic data (Fig. 1 ; Francisco and Lohmann submitted). The best quality material was selected as the holotype.

Taxonomic comments.

Pachyptera linearis is characterised by white and infundibuliform corollas, with a sparsely pubescent and sparsely lepidote ovary. Furthermore, the capsule is linear, flattened, coriaceous to woody, with an inconspicuous longitudinal midline on the valves. The seeds are oblong, thin, coriaceous to woody, winged, with short membranaceous or coriaceous and hyaline wings. Pachyptera linearis shares the white infundibuliform flowers with its sister species P. kerere (Fig. 1 ). Nevertheless, P. linearis is easily distinguible from P. kerere by the fruit morphology.

Paratypes.

VENEZUELA. Apure: galeras del Cinaruco, Rio Cinaruco, 29 km above Las Galeras de Cinaruco, 80 m, 24 Jan 1956, fl., J.J. Wurdack 41357 (K, MO, RB, S, VEN). Bolívar: Moitaco, rebalse del Orinoco, Hato Curumutopo, 8°00'00.0"N, 64°21'36.0"W, 24 Apr 1991, fr., G. Martino 22 (MO).

Figures

Figure 1. Schematic diagram summarising phylogenetic relationships within Pachyptera, with morphological characters mapped on the diagram. Names of the terminal taxa indicate the taxon in which these species were previously included. The taxonomic updates proposed here are also indicated. Relationships depicted follow Francisco and Lohmann (submitted).

Figure 13. Pachyptera linearis. A Flowering branch B Interpetiolar region with ENFs and prophylls of axillary buds 3 - seriated, flattened and ensiform C Branchlets with terminal leaflet replaced by trifid tendril (leaflet fells) D Trifid tentril E Flower F Calyx external view G Open flower showing the androecium with anthers united H Stamen with villous and curved thecae I Gynoecium J Ovary surface pubescent (J. J. Wurdack 41357, K) K Fruit flattened, with an inconspicuous longitudinal midline L Seeds wingless (P. Stevenson 403, MO).

Figure 14. Distribution of Pachyptera linearis.