[449] Sloanea acutiflora Uittien (Fig. 22A) Recueil Trav. Bot. Néerl. 22: 357 [“1925” publ. Jan. 1926] (Uittien 1926). NOTES. — Known only from the Guiana Shield. Pennington & Wise (2017: 77) placed S. acutiflora in synonymy under S. latifolia (Rich.) K.Schum., arguing that they have the same floral morphology, and that there are intermediate states throughout the range of the species (i.e. most of Amazonia) in fruit spine development and leaf shape; the typical form of S. latifolia has long petiole and large broad leaves with rounded bases while other “forms”, typified by S. acutiflora in the Guiana Shield and S. inermis Ducke in Southern and Western Amazonia, have smaller leaves with acute or cuneate base and short petioles. Our observations contradict these statements. In French Guiana, all specimens that correspond to the Pennington and Wise concept of S. latifolia can easily be separated into two very distinct groups. In the first group, which includes the original material (see Notes under S. latifolia ), trees have both buttresses and stilt roots, petioles of very variable length on the same branchlet, the longest 3-15 cm, and large leaves drying yellowish brown, of variable size but frequently 20 cm long, with rounded to obtuse, rarely cuneate base and a densely reticulate venation. Inflorescences are large, well-developed many-flowered corymbs, flower buds are slender, the base gradually attenuated on the pedicel, and covered with a dense yellow tomentum. Fruit is up to 4.5 cm long, brown, smooth, and seeds are surrounded by a white to pink aril (Fig. 22D). Trees of the second group have buttresses but no stilt roots. Petioles are shorter (usually <1 cm, rarely 1-1.5 cm). Leaves dry to a light green, and are much smaller (rarely up to 15 cm long), with an acute-attenuated base, never round or obtuse, and a much looser reticulum. Inflorescences are short, more or less cymose, bearing 1-3 (-5) flowers. Buds are subglobose to ovoid, the base abruptly reduced at the junction with the pedicel, the ...