Clusiaceae s. l. (Calophyllaceae, Clusiaceae s. s. and Hypericaceae) in the Viruá National Park, Roraima, Brazil Author Cabral, Fernanda Nunes Museu da Amazônia, MUSA, Avenida Margarida, s. n., Cidade de Deus, 69099 - 415, Manaus, Amazonas, Brazil. & Universidade do Estado do Amazonas, Pós-Graduação em Biotecnologia e Recursos Naturais, Av. Djalma Batista, 3586, Flores, Manaus, Amazonas, Brazil. Author Bittrich, Volker R. Mario de Nucci, 500, 13083 - 290 Campinas, São Paulo, Brazil. Author Hopkins, Michael John Gilbert Instituto Nacional de Pesquisas da Amazônia, Pós-Graduação em Botânica, Av. André Araújo, 2936, Petrópolis, 69060 - 001, Manaus, Amazonas, Brazil. text Phytotaxa 2017 2017-11-24 329 1 1 27 http://dx.doi.org/10.11646/phytotaxa.329.1.1 journal article 10.11646/phytotaxa.329.1.1 1179-3163 13721722 3.4 Clusia microstemon Planchon & Triana (1860: 331) ( Fig. 4A–C ) Type:— BRAZIL . Amazonas: Rio Uaupés, October 1852 , fl., Spruce 2511 ( holotype : P , barcode 01901205, isotypes : BR , barcode 0000008676702, C , barcode 10009454, E , barcode 00326699, G , barcode 00355089, GH , barcode 00026868, K , barcode 000820682, LD , barcode 1060294, NY , barcode 380975). = Clusia gaudichaudii Planchon & Triana (1860: 359) , nom. illeg . Shrubs, small trees up to 3 m or hemiepiphytes. Exudate yellowish to yellowish-brown. Lamina subcoriaceous to coriaceous, oboval or elliptical to oblanceolate, (3.5–)4.4–14 × 2.6–8.1 cm , apex obtuse, rounded to acute or subacute, base attenuate and acute; exudate channels conspicuous on both surfaces, distant 1.2–3.0 mm; secondary veins conspicuous on both surfaces, 13–38 pairs, distant 1.7–2.5 mm ; petiole (6.5–) 8.2–38.4 mm long. Inflorescence: staminate plants with clustered flowers; pistillate plants with clustered or solitary flowers; pedicels 0.8–1.0 cm long. Sepals 4, 7.0–10.6 × 7.2–10.3 mm , white to slightly pink. Petals 5–7, 13.7–19.6 × 12.1–15.4 mm , violet-pink or white and violet-pink adaxially, white-pinkish abaxially. Staminate flowers with stamens numerous, ca. 1600, densely compact, 1.8–2.2 mm long, forming a flattened synandrium with sessile anthers on top, 8–9 mm wide, the lateral side of the disk with anthers, covered with resin-pollen mix during anthesis. Pistillate flower with 2 series of staminodes around the base of the ovary, with resin at the apex; stigma 4–6, 2–4 mm long, covered with small rounded papilla. Fruit cylindrical to ovoid, 1.0–1.4 × 1.0– 1.4 cm ; sepals and stigmas persistent. Seeds with yellowish-orange aril. Phenology :—Flowering June to September; fruiting January. Distribution and habitat :— Brazil , Colombia and Venezuela . In Brazil , it occurs in the north region (states of Acre , Amapá , Amazonas, Pará, Rondônia and Roraima ), and in the northern central-west region (state of Mato Grosso ). In VNP, it is found in white-sand vegetation and at river margins. Specimens examined :— BRAZIL . Roraima : Caracaraí , Viruá National Park , elevation 11 m , 1º47’81’’N, 61º01’18’’W , 28 January 2010 , fr., Cabral et al. 190 ( INPA ) ; Ibid. , 24 July 2010 , fl., Cabral et al. 249 ( INPA ) ; Ibid. , 24 July 2010 , fl., Cabral et al. 251 A ( INPA ) ; Ibid. , 16 September 2010 , fl., Cabral et al. 287 ( INPA ) ; Ibid. , 15 January 2011 , fr., Cabral et al. 337 ( INPA ) . Additional specimens :— BRAZIL . Amazonas: Entre Paraná da Floresta e boca do rio Branco. Praia do Gavião, 26 June 1979 , fl., Maia et al. 57 (INPA) . Taxonomic notes :—For differences between Clusia microstemon and C. nitida see notes under C. nitida .