Guatteria tenera 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 : 174

161. Guatteria tenera R.E.Fr. — Map 35

Guatteria tenera R.E.Fr.(1939) 359,f.8c,d. — Type: Stork 2598 (holo F; iso S fragment), Costa Rica, San José, Santa Clara Hills , 1500 m, 16 June 1928.

Tree 3–8 m tall, diam not recorded; young twigs rather densely to sparsely covered with appressed hairs, soon glabrous. Leaves: petiole 2–5 mm long, 0.5–1 mm diam; lamina narrowly elliptic, 7–12 by 2–3 cm (leaf index 3.5–4), chartaceous, sparsely verruculose or not on both sides, shiny or dull, brownish grey above, brown below, glabrous above, sparsely covered with appressed hairs below, base acute, apex acuminate (acumen 5–10 mm long), primary vein impressed above, secondary veins distinct, 11–15 on either side of primary vein, impressed to slightly raised above, smallest distance between loops and margin c. 1 mm, tertiary veins flat or slightly raised above, reticulate to percurrent. Flowers solitary in axils of leaves; pedicels 10–20 mm long, rather densely to sparsely covered with appressed to less often erect hairs, articulated at 0.1–0.3 from the base, bracts 4–6, soon falling, not seen; flower buds broadly ovoid, shortly pointed, sepals broadly ovate-triangular, 3–4 by 3–4 mm, re- flexed, outer side densely covered with appressed hairs; petals greenish yellow in vivo, ovate, 7–12 by 3–5 mm, outer side densely covered with appressed hairs; stamens 1–1.5 mm long, connective shield papillate. Monocarps and seed unknown.

Distribution — Costa Rica.

Habitat & Ecology — In non-inundated forest. At elevations of 1500–1600 m. Flowering:April, June, July; fruiting: unknown.

Vernacular names — Not recorded.

Note — Guatteria tenera has only been collected twice so far. It is characterized by very narrow leaves with the veins impressed on the upper side. It possibly represents a narrow-leaved form of G. amplifolia .