Guatteria oblongifolia Rusby — Plate

107. Guatteria oblongifolia Rusby — Plate View in CoL 5i, 6a View Plate 6 ; Map 23

Guatteria oblongifolia Rusby (1907) View in CoL 320; R.E. Fr. (1939) 391. — Type: Bang 2232 (holo NY; iso F, G, GH, K, MO, US 2 sheets), Bolivia, without locality .

Tree 4–28 m tall, to c. 35 cm diam; young twigs densely cov- ered with erect, brown, long-persisting hairs, finally glabrous. Leaves: petiole 4–10 mm long, 1–2 mm diam; lamina narrowly elliptic to narrowly oblong-elliptic, sometimes elliptic, rarely narrowly obovate, (6–)9–24 by 2–9 cm (leaf index 2.2–5), coriaceous, not or very rarely verruculose, dull, greyish black, brownish, or greyish above, mostly brown below, rather densely to sparsely covered with appressed to erect hairs to glabrous above, densely to rather densely covered with erect to sometimes appressed, brown hairs below, primary vein keeled or not, permanently densely covered with erect, curly, brown hairs, base acute to obtuse, slightly attenuate, apex acute to acuminate (acumen 5–15 mm long), primary vein impressed to flat above, secondary veins distinct, 10–15 on either side of primary vein, raised above, smallest distance between loops and margin 1–5 mm, tertiary veins raised above, reticulate. Flowers in 1(–4)-flowered inflorescences in axils of leaves; flowering and fruiting pedicels 5–40 mm long, 1–3 mm diam, densely to rather densely covered with erect, brown hairs, becoming subglabrous in fruit, articulated at 0.2–0.5 from the base, bracts 5–7, soon falling, broadly to transversely broadly ovate, basal bracts 1–2 mm long, upper ones elliptic to broadly elliptic, 3–8 mm long; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 4–10 by 4–8 mm, reflexed, outer side densely covered with appressed hairs; petals greenish yellow, yellow, cream or red-purple (Van der Werff 8279) in vivo, narrowly el- liptic, oblong-ovate or ovate, 12– 20 by 5 –10 mm, outer side densely covered with erect, curly, greyish white to brown hairs; stamens 1.5–2 mm long, connective shield papillate, hairy, or glabrous. Monocarps 15– 60, green, maturing, brownish red to blackish in vivo, brown to black in sicco, ellipsoid, rarely subglobose, 9 –15 by 5–10 mm, rather densely to sparsely covered with appressed and erect hairs, soon glabrous, apex rounded to apiculate (apiculum <0.5 mm long), wall 0.3–0.7 mm thick, stipes 1–12 by 1–2 mm or absent. Seed ellipsoid, rarely subglobose, 10–16 by 5–8 mm, mostly dark, shiny brown, pitted to rugulose, raphe not distinct from rest of seed.

Distribution — Ecuador (Chimborazo, Zamora-Chinchipe), Peru (Cajamarca, Cusco, Pasco, San Martín ), Bolivia (La Paz).

Habitat & Ecology — In montane or premontane forest (‘bosque yungueño montano pluvial’, ‘bosque enano’, ‘bosque semichapparado’, low dense forest with sandstone-restricted trees and shrubs), with Alchornea sp. , Aniba muca , Beilschmiedia tovarensis , Clethra spp. , Clusia sp. , Cyathea spp. , Eleagia mariae , Graffenrieda emarginata , Hedyosmum sp. , Helicostylis tovarensis , Lauraceae spp., Miconia spp. , Nectandra cf. laurel and Weinmannia spp. , on sandstone soils. At elevations of 1000–2900 m. Flowering: throughout the year; fruiting: through- out the year.

Vernacular names — Not recorded.

Notes — Guatteria oblongifolia is one of the few species of Guatteria which is restricted to high elevations, namely montane and premontane forests of Ecuador, Peru and Bolivia. It is well recognizable by coriaceous leaves, a dense indument of rather long-persisting, erect, brown hairs on the young twigs and lower side of the lamina, and by shortly stipitate or sessile monocarps. The indument on the upper side of the lamina is variable, though, with specimens from the Northern part of the range with the upper side of the lamina being rather densely covered with erect hairs, and those of the Southern part sparsely so to glabrous. As all specimens examined match with each other in general, e.g., flower and fruit features, we favour the concept of one species. For some time we had provisionally indicated it as ‘hairy high elevation Guatteria ’, but upon closer look we have concluded that it is identical with Rusby’s albeit poorly known concept of G. oblongifolia . The type collection by Miguel Bang from Bolivia lacks any precise data. It seems safe to assume that it originated from the department of La Paz, like many recent collections of this species.

Several collections from the Peruvian department of Pasco have densely verruculose leaves, otherwise not known in G. oblongifolia . Most other collections from that region look very similar but lack the tiny warts. It is hardly conceivable that the verruculoseleaved specimens belong to a different species; they are best treated as an aberrant form of G. oblongifolia . It involves: PERU, Pasco, Oxapampa,Distr.Palcazú,Reserva Comunal Yanesha,Comunidad Nativa San Pedro de Pichanaz, Sector Azulis, 910 m, Monteagudo M. et al. 9816 (MO); Oxapampa, Distr. Huancabamba, Parque Na- cional Yanachaga-Chemillén, Río Chillcatambo, 1800 m, Monteagudo M. et al. 16588 (L, MO); Oxapampa, Distr. Huancabamba, Parque Nacional Yanachaga-Chemillén, Cajonpata-María Puñis, 1870 m, Monteagudo M. et al. 16864 (L, MO); Oxapampa, Distr. Huancabamba, Parque Nacional Yanachaga-Chemillén, near house of Orlando Quispe, 1894 m, Monteagudo M. et al. 16960 (L, MO); Oxapampa, Distr. Palcazú, comunidad Nativa Alto Lagarto, Reserva Comunal Yanesha, 584 m, Rojas & Ortiz 7029 (L, MO), 7101 (L,MO);Oxapampa,Distr.Huancabamba,Parque Nacional Yanachaga-Chemillén, Sector Tunqui, 1760–1857 m, Vásquez et al. 33241 (L, MO), 35115 (L, MO), 35125 (L, MO); Oxapampa, Distr. Villa Rica, Sector Ubiriqui, 1537 m, Vásquez et al. 36042 (L, MO)