Guarea juglandiformis T.D.Penn.

  • Authority

    Pennington, Terence D. 1981. Meliaceae. Fl. Neotrop. Monogr. 28: 1-359, 418-449, 459-470. (Published by NYBG Press)

  • Family

    Meliaceae

  • Scientific Name

    Guarea juglandiformis T.D.Penn.

  • Type

    Type. Prance, Pena & Ramos 2837, Brazil, Acre, road Cruzeiro do Sul to Japiim, km 18, fl (holotype, INPA; isotypes, FHO, K, NY, S).

  • Description

    Latin Diagnosis - Rami novelli pilis crebris papillulis rubris commixtis adpresse puberuli, demum glabri, asperi, brunnei. Folia pinnata gemmula terminali coronata, usque ad 60 cm longa; petiolus semiteres; rhachis teres, pilis interdum papillis rubris commixtis puberula; petiolulus 4-12 mm longus. Foliola 5-7-juga, oblonga, elliptica vel lanceolata, apice acuminata vel anguste attenuata, basi (saltern superiorum) anguste attenuata, saepe in petiolulum decurrentia, chartacea, 17-22[19.6] cm longa, 5.5-6.5[5.8] cm lata, pagina superiori glabra vel secus costam sparse puberula, pagina inferiori sparse usque modice puberula, crebris papillulis rubris conspersa, interdum obscure pellucido-punctata; venatio eucamptodroma, costa plana vel paullum impressa; nervi secundarii 10-12 utroque costae latere, ad-scendentes, arcuati, convergentes, intersecundarii nulli, tertiarii ± obliqui. Inflorescentia axillaris, usque ad 35 cm longa, graciliter thyrsiformis, cymulas 3-floras distantes gerens vel ramulis lateralibus parte inferiore instructa, gemma congesta terminata (gemma incremento apicali intermittente et indeterminata), pubescens; pedicellus ca. 1 mm longus. Calyx patelliformis vel vadose cyathiformis, ca. 1.5 mm longus, irregulariter in 3-4 lobos ovatos, acutos, ad 1.25 mm longos fissus, adpresse puberulus. Petala 4, valvata, ca. 5.5 mm longa, ca. 1.5 mm lata, ligulata, apice acuta, extus dense strigosula, intus glabra. Tubus stamineus ca. 4 mm longus, ca. 1.25 mm latus, margine truncatus, glaber; antherae 8, ca. 1.25 mm longae. Nectarium stipitiforme, ca. 0.5 mm longum, glabrum, infra ovarium in annulum ampliatum. Ovarium 4-loculare, dense strigosum, loculis uniovulatis; stylus glaber. Capsula globosa, apice truncata, basi rotundata, ca. 12 alis longi-tudinalibus tenuibus, convolutis, anastomosantibus, 5-6 mm altis praedita, glabra vel papillulis rubris conspersa, 2.5-3 cm diam., 4-valvata, valvis monospermis; pericarpium (alis exclusis) ca. 1 mm crassum. Semen ellipsoideum, ca. 1.4 cm longum, 0.9-1 cm latum, tenui sarcotesta aurantiaca cinctum; testa tenuis, cartilaginea; hilum ca. 1 cm longum, 0.6 cm latum. Embryo cotyledonibus crassis, plano-convexis, superpositis; radicula abaxialis, superficiem attingens.

  • Discussion

    Relationships

    In structure of the fruit G. juglandiformis is similar to G. cristata but it differs from that species in many other characters, viz. indumentum, venation, size of flowers and number of floral parts.

    Field characters: Treelet to 5 m high with cream-coloured flowers. The mature fruit is dark red. The only flowering record is from October, and the fruiting specimens were collected in April, August and September. Its floral formula, K 3-4, C 4, A 8, G 4 (with uniovulate locules) is much closer to that of the smaller flowered G. velutina, with which it also shares the winged fruit. For a detailed discussion of the differences between these two species, see under G. velutina.

  • Distribution

    Lowland non-flooded forest in extreme western Amazonia.

    Peru South America| Loreto Peru South America| Acre Brazil South America|