Virola alvaroperezii D. Santam., 2022
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|Virola alvaroperezii D. Santam.|
2. Virola alvaroperezii D. Santam. sp. nov.
Ecuador. Carchi: Tulcan Cantón, Parroquia Tobar Donoso, Reserva Indigena Awa , Centro El Baboso , 00°53'N, 078°25'W, 1800 m, 17-27 Aug 1992 (♀ fl and fr), G. Tipaz, M. Tirado, C. Aulestia, N. Gale & P. Ortiz 1789 (holotype: MO-2 sheets! [flowers: accession 05005569, barcode MO-1528199; fruits: accession 05005570, barcode MO-1528198]; isotypes: QCNE [n.v.]). Fig. 7 View Figure 7 GoogleMaps
Virola alvaroperezii is more similar to V. macrocarpa and V. otobifolia from Colombia, Panama, respectively. All these species have relatively large leaf blades and fruits, with lateral veins that are well separated and the abaxial leaf surface covered with stellate, sessile trichomes. Morphologically, it differs from V. macrocarpa and V. otobifolia by the abaxial leaf surface densely pubescent (vs. sparsely pubescent). Additionally, it differs from V. macrocarpa in having lateral veins that are more separated ([2-] 2.4-2.7 cm apart vs. 0.8-1.5 cm apart), and large fruits (4.3-4.5 × 3-3.6 cm vs. 2.7-3.3 × 2-2.3 cm). It differs from V. otobifolia by its wide fruit (3-3.6 cm vs. [1.9-] 2.3-2.9) and thin pericarp (2.8 mm vs. [2.7-] 3-4.7 mm).
Tree 30-40 m × 60-70 cm diameter, inner bark and exudate not described. Twigs 0.37-0.4 cm thick, terete to slightly compressed, inconspicuously pubescent, trichomes dendritic, sessile, ferruginous, without lenticels. Leaves young terminal bud not seen; petiole 1.5-2 × 0.34-0.5 cm, terete to slightly canaliculate, sometimes slightly winged, tomentose to tomentulose, the trichomes dendritic; leaf blades 26-28.5 × 12.1-14 cm, widely elliptic; adaxial surface of mature leaves drying brown to brown-olivaceous, the surface smooth, sometimes shiny, glabrous; abaxial surface drying dark brown-reddish to brown-whitish, densely pubescent, the trichomes stellate, ca. 0.1 mm diameter, sessile, the central part of the trichome dark reddish or colorless, the branches brown-reddish or colorless; lateral veins ca. 15, ca. 3 veins per 5 cm, spaced (2-) 2.4-2.7 cm, adaxially the same color as the leaf surface or slightly darker, flat to slightly raised, abaxially brown to blackish, raised, glabrescent above, densely pubescent to the sides, arcuate-ascending distally, slightly anastomosing near the margin and without forming a marked intramarginal vein; tertiary veins lightly visible on both sides, but especially below; midvein adaxially flat to slightly elevated, abaxially raised, rounded, glabrescent to tomentose; base obtuse, not revolute, flat; margin flat; apex absent. Staminate inflorescence and flowers unknown. Pistillate inflorescence ca. 4.2 cm long, axes flattened, tomentose, with trichomes dendritic, ferruginous; peduncle ca. 1.2-1.7 × 0.3-0.35 cm; main axes with 5 ramifications; bracts not seen. Pistillate flowers in terminal fascicles of 2-3 flowers, on a receptacle ca. 6 mm wide; perianth ca. 6 mm long, lanceolate, fleshy, brown when fresh, connate by ca. 3-3.2 mm long, external surface densely pubescent with ferruginous and dendritic trichomes, internal surface pubescent (especially on the lobes); lobes 3, ca. 2.8 × 1.2-1.5 mm and ca. 0.5-0.6 mm thick, without resinous punctuations when rehydrated; gynoecium ca. 2.5-3.1 × 1.5-1.6 mm, conical to subglobose, densely pubescent, the trichomes ferruginous; stigma 2-lobed, ca. 0.5 × 0.3 mm, erect, flat seen from above, drying blackish, slightly wavy at the margins. Infructescence ca. 4.5 cm long, with 1 or 4 fruits in immature infructescence, peduncle ca. 1.5 × 0.8 cm. Fruits 4.3-4.5 × 3-3.6 cm, brown when fresh (probably by the indument), ellipsoid, shortly stipitate, densely tomentose, the trichomes dendritic, sessile, ferruginous, not falling to the touch like dust, the surface rugose, the line of dehiscence smooth to faintly carinate, the base obtuse to truncate, the apex obtuse; pericarp 2.8 mm thick; pedicel 0.6-1 cm long. Seed ca. 2.7 × 1.6 cm, the testa dark brown to blackish when dry, sulcate; aril described once as red when fresh, dark brown when dry, the texture dry and thin, laciniate almost to the base, in narrow bands distally.
Virola alvaroperezii is a distinctive species characterized by generally large, wide leaf blades with well-separated lateral veins that are abaxially covered with dense pubescence of stellate, sessile trichomes (Fig. 4B View Figure 4 ) and large fruits (4.3-4.5 × 3-3.6 cm) with thick pericarp (2.8 mm) (Fig. 6B View Figure 6 ). It is also distinctive for being a large tree (30-40 m tall).
It is a great pleasure to dedicate this new species to the Ecuadoran botanist Álvaro Javier Pérez Castañeda. He is an excellent botanist, collector and expert of the flora of Ecuador, especially the flora of Yasuní. Among other contributions, he has described at least 26 from different angiosperm families (e.g., Pérez et al. 2013; Torke and Pérez 2013; Kawasaki and Pérez 2015, 2016) and is coauthor of Árboles emblemáticos de Yasuní, Ecuador ( Pérez et al. 2014) and the treatment of Myrtaceae for the Flora of Ecuador ( Kawasaki et al. 2019). Pérez Castañeda collected specimens of some of the Virola species described here.
Only a single studied specimen of Virola alvaroperezii has pistillate flowers; it was collected in August. Staminate flowers were not observed in the studied material. Fruits were collected in August and September.
Common name and uses.
Guangare macho (Ecuador; C. Aulestia & M. Aulestia 1017).
Preliminary conservation status.
Virola alvaroperezii is Endangered following IUCN criteria B1a and B2a. It is known from three localities, has an EOO of 966 km2, and an AOO of 12 km2. Further justifying this status, this new species occurs in a region of very high rates of deforestation due to agricultural pressures ( Kleemann et al. 2022). The only specimens of V. alvaroperezii that we were able to verify were collected on the Awá Reserve, and this species may be locally protected by sustainable forestry practices by the Awá indigenous community ( Oviedo 2006).
Herbarium specimens of Virola alvaroperezii have been confused with another montane species, V. macrocarpa from Colombia (1100 m elevation). It could be confused with another Colombian species, V. cogolloi (840-1500 m elevation), which is formally described here, as well with V. otobifolia D. Santam., recently described from Panama (50-850 m elevation) ( Santamaría-Aguilar et al. 2019). All these species have relatively large leaf blades and fruits, with lateral veins that are well separated and the abaxial leaf surface covered with stellate, sessile trichomes. Differences among the three species are summarized in Table 2 View Table 2 .
The holotype deposited at Missouri Botanical Garden (MO) represents a single collection mounted on two sheets that are clearly labeled (i.e., "Sheet 1 of 2" and "Sheet 2 of 2") as being parts of the same specimen (ICN Art. 8.3; Turland et al. 2018); one of the sheets carries pistillate flowers (MO-05005569) and the other, fruits (MO-05005570).
Leaf size and the number of lateral veins may be higher than presented here, as most of the material examined had broken leaves.
The collection C. Aulestia & M. Aulestia 1017 (MO) from Esmeraldas Province, Ecuador bears a fruit (possibly immature) that is smaller (ca. 3.7 × 2.6 cm) with thinner pericarp (ca. 2 mm) than other specimens of V. alvaroperezii . However, it otherwise matches very well including in its leaf morphology, tall tree habit, and occurrence Río Mira basin; for this reason, it is included in the concept we have adopted, although the fruit measurement is not included in the description.
The fruit specimen H. Vargas et al. 4603 (MO, QCNE [image!]), also from Esmeraldas Province, Ecuador, could not be confirmed to the species. It is similar to V. alvaroperezii in its leaf morphology (e.g. size, pubescence and trichomes, lateral vein spacing); however, its fruits are rounded and smaller (ca. 3.2-3.3 × 2.6-2.7 mm) with a conspicuous carina.
The two collections of V. macrocarpa from Carchi Province that are cited in Flora of Ecuador ( Jaramillo et al. 2004) correspond to this new species.
Ecuador. Carchi: Tulcán cantón, Reserva Indígena Awá, Comunidad El Baboso , 12 km al norte de Lita, 00°53'N, 078°20'W, 1600 m, 20 Sep 1991 (fr), D. Rubio et al. 2205 (MO!, QCNE [n.v.]) GoogleMaps . Esmeraldas: Reserva Etnica Awá, Parroquia Ricaurte, Centro Pambilar , 01°08'N, 078°36'W, 500 m, 21 Jan 1993 (fr), C. Aulestia & M. Aulestia 1017 (MO!, QCNE [n.v.]) GoogleMaps .
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