Guatteria maguirei R.E.Fr.

Maas, P. J. M., Westra, L. Y. T., Guerrero, S. Arias, Lobão, A. Q., Scharf, U., Zamora, N. A. & Erkens, R. H. J., 2015, Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae), Blumea 60 (1), pp. 1-219 : 105-107

93. Guatteria maguirei R.E.Fr. — Fig. 36f, g , 46 ; Map 21

Guatteria maguirei R.E.Fr. (1957a) 328; Steyerm. et al. (1995) 446; Murillo A. & Restrepo (2000) 103, f. 30. — Type: B. Maguire & C.K. Maguire 35657 (holo S; iso F, K, NY, US), Venezuela, Amazonas, Cerro Yutaje , Río Manapiare , Caño Yutaje , 1250 m, 12 Feb. 1953.

Tree or shrub 0.5–6 m tall, diam not recorded; young twigs sparsely covered with appressed hairs, soon glabrous. Leaves: petiole 2–5 mm long, 0.5–1 mm diam; lamina narrowly ovate, 5–9 by 2–3 cm (leaf index 2.4–3.1), coriaceous, not verrucu- lose, shiny above, blackish brown to dark brown above, brown below, glabrous above, sparsely covered with appressed hairs to almost glabrous below, base obtuse, apex acuminate (acu- men 5–15 mm long), primary vein impressed above, secondary veins distinct, 7–11 on either side of primary vein, raised above, smallest distance between loops and margin 1–2 mm, tertiary venation raised above, reticulate. Flowers solitary in axils of leaves; pedicels 10–30 mm long, 0.5–1 mm diam, fruiting pedicels to c. 35 mm long, sparsely covered with appressed or with some erect, curly hairs, articulated at 0.2–0.3 from the base, bracts c. 5, soon falling or sometimes present at flowering, broadly elliptic to elliptic, basal bracts c. 1 mm long, upper ones to c. 7 mm long; flower buds depressed ovoid; sepals free, broadly to shallowly ovate-triangular, 2–4 by 3–4 mm, appressed, but finally spreading to apically reflexed, outer side sparsely covered with appressed hairs; petals green, matur- ing yellow in vivo, ovate to elliptic or narrowly so, 10– 22 by 3–8 mm, outer side sparsely covered with appressed hairs, but basal part densely so; stamens c. 1 mm long, connective shield papillate. Monocarps 10–30, green, maturing black in vivo, black to dark brown in sicco, ellipsoid, 8–9 by 3–6 mm, sparsely covered with appressed hairs, soon glabrous, apex apiculate (apiculum 0.1–0.2 mm long), wall 0.1–0.2 mm thick, stipes 1–2 by 1–2 mm. Seed ellipsoid, 5–7 by 3–4 mm, dark brown, pitted to rugulose, raphe impressed.

Distribution — Amazonian Colombia (Amazonas, Caquetá), Venezuela (Amazonas), Brazil (Amazonas).

Habitat & Ecology — In shrub islands in savannas and in forest margins adjoining savannas, or in dwarf forest over sandstone with eroded crevices, mostly on white sands. At eleva- tions of 100–1200 m. Flowering: March, May, July, September, November, December; fruiting: March, November, December.

Vernacular name — Venezuela: Majagua (Velazco 1177a).

Note — Guatteria maguirei , one of the few savanna inhabiting species in the genus, is easily distinguished by its thick and tiny, ovate leaves, combined with relatively long pedicels (up to c. 35 mm long in fruit) and small stipes (up to c. 2 mm long). Like in the probably related G. atabapensis , there is a strongly reticulate venation on the upper side of the lamina.

Figures

Fig. 36 a. Guatteria elata R.E.Fr. Flower. – b. Guatteria fractiflexa Maas & Westra. Flower. – c. Guatteria herrerana N.Zamora & Maas. Fruit on stem. – d, e. Guatteria hirsuta Ruiz & Pav. d. Flowers; e. fruit. – f, g. Guatteria maguirei R.E.Fr. f. Flowers; g. fruit. – h. Guatteria maypurensis Kunth. Fruit (a: Daly et al. 5797, U; b: Vásquez 27596, U; c: G. Herrera C. 8401, holotype part CR; d: Killeen 2802, U; e: W. Palacios 7526, U; f: O. Huber 5130, U; g: Huber & Tillett 2888, U; h: Zarucchi & Barbosa 3828, U).

Fig. 46 Guatteria maguirei R.E.Fr. Flowering branch (Huber & Tillett 2967, U).