Miconia pagnolensis Majure & Judd

Majure, Lucas C., Becquer, Eldis R. & Judd, Walter S., 2016, Revision of the Lima clade (Miconia sect. Lima, Miconieae, Melastomataceae) of the Greater Antilles, PhytoKeys 72, pp. 1-99: 71-73

publication ID

http://dx.doi.org/10.3897/phytokeys.72.9355

persistent identifier

http://treatment.plazi.org/id/CF6F4408-BFB1-9A32-5309-329154862586

treatment provided by

PhytoKeys by Pensoft

scientific name

Miconia pagnolensis Majure & Judd
status

sp. nov.

19. Miconia pagnolensis Majure & Judd  sp. nov. Fig. 20FView Figure 20

Diagnosis.

Species differing from Miconia lima  in its smaller size (shrub 0.5-0.9 m tall vs. 1.5-5 m tall), smaller leaves (0.9-2.3 × 0.5-1.2 cm vs. 0.7-5.7 × 0.42-3.2 cm) and leaf apex (obtuse to acute in Miconia pagnolensis  vs. acute to acuminate in Miconia lima  ).

Type.

HAITI. Dept. du Sud. Massif de la Hotte, near Morne Bois Pagnol, 12.7 km NE of Duchity, 18.41664°N, - 73.77299°W, 1184 m, 20 Jun 2012, J. Timyan 27 (holotype FLAS! [FLAS260449]).

Description.

Evergreen shrub, 0.5-0.9 m tall, stems round in cross section, not ridged, the internodes 0.3-0.67 cm long, stem indumentum of ascending, appressed bulla-based hairs, the longest to 0.6 mm long, nodal line present. Leaves oppostie, decussate, elliptic, small, 0.9-2.3 × 0.5-1.2 cm, base acute, apex obtuse to acute, venation acrodromous, 5-veined, the midvein and two pairs of arching secondary veins, outermost pair of secondary veins basal, intramarginal, innermost pair suprabasal to basal, produced 0.4-1.4 mm from the base, 1.1-2 mm in from the margin at widest point of leaf blade, tertiary veins percurrent, more or less perpendicular to the primary vein, 0.9-1.7 mm apart at midleaf, intertertiary veins obscure but present, tertiary veins often joined by obscure quaternary veins; adaxial leaf surface covered in well developed bulla-based hairs, these completely covering the leaf areoles, the largest 1.6 mm wide at the base, clavate-dendritic hairs prominent in young leaves along the primary, secondary, tertiary and quaternary veins, especially toward the base, abaxial leaf surface covered in bulla-based hairs, those along the primary and secondary veins larger than those along the epidermis and tertiary veins, mostly ascending to appressed, prominent pits formed from the adaxial surface hairs, sessile, glandular hairs throughout the lamina; petioles 1.5-4.5 mm long, covered in ascending, appressed bulla-based hairs. Inflorescences terminal, structure indiscernable (only immature inflorescence seen).

Phenology.

Immature inflorescences can be seen on the type specimen collected in late June.

Distribution

(Fig. 21View Figure 21). This species is restricted to the Massif de la Hotte, Haiti, and is only known from the type locality.

Etymology. The specific epithet, pagnolensis  , refers to the type locality, Morne Bois Pagnol, and the only place that this species has been collected. It should be noted that there are differing spellings for the type locality. The word is derived from the French, Espagnol (meaning Spanish). The Haitian Creole spelling for the site is Panyòl, although it is also spelled Pangnol and Pagnol (J. Timyan, pers. comm.). We have chosen to use the spelling Pagnol for the site and thus the specific epithet, pagnolensis  .

Ecology.

This species has been collected in a moist, broadleaved forest on karst limestone at around 1200 m in elevation and is associated with Abarema  sp. ( Fabaceae  ), Brunellia comocladifolia Bonpl. subsp. domingensis  Cuatrec. ( Brunelliaceae  ), Byrsonima  sp. ( Malpighiaceae  ), Cyathea  sp. ( Cyatheaceae  ), Schefflera tremulua  (Krug & Urb.) Alain ( Araliaceae  ), Garrya faydenii  Hook. ( Garryaceae  ), Prestoea montana  (Graham) G.Nicholson ( Arecaceae  ), and Wercklea hottensis  (Urb.) Fryxell ( Malvaceae  ).

Conservation status.

The conservation status of this species is unknown, however, the location of this collection is surrounded by degraded, remnant moist tropical forest, most of which has been cleared for subsistence farming. Thus, Miconia pagnolensis  is likely endangered by habitat loss. However, we suggest a preliminary status of data defficient until future fieldwork can further illuminate population sizes of the species.

Discussion.

Material of this new species has been collected only once by Joel Timyan (i.e., Timyan 27, FLAS). According to phylogenetic analyses ( Majure et al. 2015), this species is phylogenetically distinctive and most closely related to members of the Acuminata  subclade of the Lima  clade (Fig. 2View Figure 2). Miconia hybophylla  is the only other putative member of the Acuminata  subclade in Haiti. Additionally, vegetative morphology certainly places Miconia pagnolensis  within the Lima  clade (Fig. 26FView Figure 26). The type specimen shows phenetic similarity with Miconia lima  , but the shrubs are smaller than Miconia lima  (0.5-0.9 vs. 1.5-5 m tall), with mostly smaller leaves (0.9-2.3 × 0.5-1.2 cm vs. 0.7-5.7 × 0.42-3.2 cm), with obtuse to acute (vs. acute or acuminate) apices. Miconia pagnolensis  also occurs outside of the range of Miconia lima  , which, in the southern peninsula of Haiti, is only known from the Massif de la Selle. We formally name this species, despite its being known only from an essentially vegetative specimen, because our analysis of molecular data clearly indicates the phylogenetic distinctiveness of the taxon, and because its vegetative morphology is diagnostic (allowing it to be distinguished from the phenetically similar Miconia lima  ). The specific epithet refers to the type locality - which is quite inacessable. We think it is important to have a formal name for this rare taxon, as it may be years before it is re-collected (unfortunately, like several other species of sect. Lima  , which are only known from the type gathering), and knowledge of its existence will stimulate searches.