Guatteria amapaensis Maas & Westra, 2015

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 : 31

9. Guatteria amapaensis Maas & Westra , sp. nov. — Fig. 12 , 13a ; Map 3

Species praecipue monocarpiis dense lanatis et seminibus rugosis bene distincta. — Typus: Rabelo et al. 3132 (holo U; iso K, MO, NY), Brazil, Amapá, Mun. Macapá, 13 km SE of Riozinho on highway ‘ Perimetral Norte’ ( BR 210 ), 1 Jan. 1985 .

Tree 4–12 m tall, c. 16 cm diam; young twigs densely covered with erect hairs, soon glabrous. Leaves: petiole 10 –15 mm long, 1–2 mm diam; lamina narrowly elliptic, 15–26 by 4.5–9 cm (leaf index 2.9–3.9), chartaceous, not verruculose, dull, dark brown above, brown below, glabrous above, rather densely covered with erect hairs below, base long-attenuate, apex acuminate (acumen 10–20 mm long), primary vein impressed above, secondary veins distinct, c. 15 on either side of primary vein, impressed above, smallest distance between loops and margin 2–3 mm, tertiary veins flat to slightly raised above, percurrent. Flowers in 1–2-flowered inflorescences, in axils of leaves or (fruiting) on leafless branchlets; flowering and fruiting pedicels 5–10 mm long, c. 2 mm diam, densely covered with erect and appressed, woolly hairs, articulated at 0.2–0.4 from the base, bracts 4–5, soon falling, the basal ones to c. 2 mm long, the 2 upper ones ovate-traingular, c. 4 mm long; flower buds conical, pointed; sepals free, broadly ovate-triangular, 3–6 by 4–5 mm with markedly acuminate apex, appressed, outer side densely covered with erect and appressed, wooly hairs; petals greenish in vivo, narrowly ovate-triangular, 11–13 by 4–5 mm, outer side densely covered with erect and appressed, wooly hairs; sta- mens c. 2 mm long, connective shield densely hairy. Monocarps c. 20, red in vivo, greyish brown in sicco, ellipsoid, 13–15 by 7–9 mm, densely covered with erect hairs, apex rounded, wall c. 0.5 mm thick, stipes 5–11 by 2 mm. Seed ellipsoid, 7–12 by 6–7 mm, brown, rugose, raphe not distinct from rest of seed.

Distribution — Brazil (Amapá).

Habitat & Ecology — In non-inundated, moist forest, on steep slope. At about sea level. Flowering: January; fruiting: January.

Vernacular names — Not recorded.

Other specimens examined. BRAZIL, Amapá, Mun. Macapá, Perimetral

Norte , 122 km NW of Porto Grande, 1 Jan. 1985, Daly et al. 4028 ( NY, U) .

Note — Guatteria amapaensis , only known from the type locality, has previously been considered to be an extreme form of G. blepharophylla by Maas & Westra (2011) and was included in that species. It is different from it, however, by the total lack of verruculae on the leaves and by the densely hairy monocarps, and also by the rugose seeds.

Figures

Fig. 12 Guatteria amapaensis Maas & Westra. Flowering branch (Rabelo 3132; isotype K).

Fig. 13 a. Guatteria amapaensis Maas & Westra. Fruit. – b. Guatteria antioquensis Maas & Westra.Fruit. – c. Guatteria atabapensis Aristeg. ex D.M.Johnson & N.A.Murray. Fruiting branch, detail. – d. Guatteria auyantepuiensis Maas & Westra. Detail of flower. – e, f. Guatteria beckii Maas & Westra. e. Flower; f. fruit. – g. Guatteria beniensis Maas & Westra. Young fruit, also note densely erect hairy juvenile parts in upper left. – h. Guatteria blainii (Griseb.) Urb. Detail of flower (a: Daly et al. 4028, U; b: E. Correa et al. 93, U; c: Wurdack & Adderley 42759, isotype US; d: F. Cardona 2619, holotype US; e, f: Beck & Haase 9895, holotype U; g: Nee 34593, holotype NY; h: Ekman 5920, S).