Duguetia chrysea Maas

  • Authority

    Maas, Paulus J. M., et al. 2003. (Annonaceae). Fl. Neotrop. Monogr. 88: 1-274 pp. (Published by NYBG Press)

  • Family

    Annonaceae

  • Scientific Name

    Duguetia chrysea Maas

  • Type

    Type: Brazil. Amazonas: Distr. Agropecuário, km 41 of Manaus-Caracaraí Hwy., Reserva 1501, alt. 5-125 m, 5 Aug 1989 (fl), Mori et al 20697 (holotype, INPA; isotypes, K, MO, NY, U).

  • Description

    Species Description - Tree, 10-28 m tall, 15-30 cm in diam. Young twigs and petioles totally covered with brownish, entire to stellate scales 0.1-0.8 mm in diam. Petioles 5-8 mm long, 1-2 mm in diam. Lamina narrowly elliptic to elliptic, 5-12 cm long, 2.5-4 cm wide (up to 18 x 6 cm in vegetative collections), leaf index 2-3, chartaceous, greyish (to greyish brown), black when young above, golden brown below, glabrous above, totally covered with brownish entire to stellate scales 0.1-0.8 mm in diam. below, base acute, apex acute to shortly acuminate (acumen to 5 mm long, somewhat longer in vegetative material), primary vein impressed above, secondary veins straight (to curved), 10-13 on either side of primary vein, flat to slightly raised above, angles with primary vein 65-70°, loop-forming at right to obtuse angles, loops distinct, smallest distance between loops and margin 45 mm, tertiary veins flat to slightly raised above. Inflorescences among leaves, leaf-opposed, 1-4-flowered, to 7 flowers in succession. Indument: pedicels and outer side of bracts, sepals, and petals totally covered with brownish, entire scales 0.1-0.6 mm in diam., inner side of sepals and petals totally covered with stellate hairs 0.1-0.4 mm in diam., inner 1/5 of petals glabrous. Peduncle 0-3 mm long, 1-2 mm in diam. Sympodial rachis to 4 mm long. Pedicels 10-15 mm long, 1 mm in diam., fruiting pedicels to 5 mm in diam. Upper bract at 1/3 to 1/2 of base of pedicel, broadly ovate, ca. 1 mm long. Flower buds ovoid. Flowers green to cream in vivo, inner base of petals dark red. Sepals connate for 25-30%, triangular to deltate, soon reflexed, 6-8 mm long, 4-7 mm wide, acute to obtuse. Petals subequal, elliptic to obovate, older ones distinctly narrowed to the base, 10-23 mm long, 5-10 mm wide, obtuse (angle ca. 90°), inner base of inner petals callose, grooved. Stamens 0.8-1 mm long, pink to red, apex of connective discoid, 0.2 x 0.5 mm, papillate. Carpels 1.5-2 mm long, ovary totally covered with stellate hairs, stigma glabrous. Fruit brownish in sicco, globose, 3.5-5 cm in diam., basal collar composed of 7-10 connate, sterile carpels, 10-18 mm in diam., protruding below the fruit, fertile carpels 40-50, obtrulloid, 9-12 mm long, 6-15 mm in diam., free, areoles broadly to shallowly ovoid-pyramidal, 4-9 mm high, 4-5-ribbed, obtuse, apiculate (apicule to 2 mm long), rough, totally covered with brown, stellate scales 0.1-0.5 mm in diam. Seeds narrowly obovoid to obovoid, 16-17 mm long, 6-8 mm in diam., acute to rounded, dark brown, shiny.

  • Discussion

    Wood is used for house pools.

    Duguetia chrysea is one of the most distinctive species in the Amazon region and southern Guyana because of its golden brown, dense indument on many parts. It seems to be without close relatives, although in cluster analysis it ends up near D. stelechantha (Fig. 37, below 4th cluster).

    The collection Barbosa 901 represents a strongly-fasciated form. It was identified to this species mainly because of good resemblance of the leaf indument.

    In a large-scale tree inventory of upland rain forest in an area north of Manaus, much attention was given to, among others, Annonaceae (Rankin-de-Mérona et al., 1992). As far as preliminary results indicate, the family occupies the third place in species richness in the area of study. The distribution of the seven most common species of Annonaceae (including three Duguetia species) in the inventory area is given in table 4 of that paper (l.c.: 504). D. chrysea (as Duguetia sp. 59) appeared to be represented by no less than 105 trees in the 70 hectares surveyed. Within Duguetia, D. chrysea was surpassed in number only by D. manausensis. The third most-frequent species was D. echinophora (as Duguetia sp. 37) with 72 trees.

  • Common Names

    Xaxerany

  • Distribution

    Southern Guyana and central Amazonian Brazil. In non-inundated forest; on sandy soil (in Guyana). At elevations from sea level up to 300 m. Flowering from May to September, fruiting in September and October. Fruit is eaten by capuchin monkeys.

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