| (fig. 3) | | | (fig. 8) | (fig. 9) |
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| Geographical distribution (Amazonian phytogeographical provinces according to Prance 1973, 1977) | Eastern Amazonia (Jari-Trombetas) | Panama, Nicaragua and Costa Rica | Venezuela | Western Amazonia (Northwestern Sector) | Central Amazonia (Xingu-Madeira) |
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| Habit | Treelets to trees 5–10 m tall | Trees 10–40 m tall | Shrubs to treelets 3–8 m tall | Trees ca. 33 m tall | Trees 10–12 m tall |
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| Petiolar extrafloral nectary (size, shape and position) | 3.5–4 × 1–1.5 mm; conical (with 3 distinct levels); basal | 1.5–2.2 × 1–1.5 mm; verruciform with an elongated base; basal | ca. 2 × 1 mm; verruciform with an elongated base; apical | 1.5–3 × 1–1.5 mm; conical; basal | 2 × 1–1.5 mm; conical; basal |
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| Number of pairs of pinnae | (8–)9–11(–13) | 8–11 | 3–4 | 4–8 | 4–7 |
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| Extrafloral nectaries of the rachis (number, size and shape) | 1–3(–4); ca.1.5 × 1.5 mm; conical to verruciform with an elongated base | 1–2(–3); 1 × 1–1.5 mm; conical | 1; ca. 1 × 0.5 mm; verruciform | 1–4; ca.1 × 1 mm; conical | 1–3; ca. 0.5 × 1 mm; verruciform to verruciform with an elongated base |
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| Number of pairs of leaflets | (6–)9–14 | (8–)10–16(–18) | (5–)6–10 | (5–)7–14 | 5–10 |
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| Extrafloral nectaries of the rachillae (number, size and shape) | 1–3; ca.1 × 1 mm; conical (usually present only at the 2–3 proximal pairs of pinnae) | 1–3; 0.5–0.8 × 0.2 mm; verruciform | 1(2–); 1–2 × 0.5 mm; ellipsoid | 2–9; ca.0.5 × 0.5 mm; verruciform | 2–9; ca. 0.5 × 0.5 mm; verruciform |
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| 2nd degree petiolule indumentum | Yellow-puberule | Sparsely puberule to rarely puberule | Glabrous to sparsely puberule | Yellow-pubescent | Yellow-pubescent |
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| Size of leaflets | (5–)7–13 × (4–)5–8 mm | (8–)10–22(–37) × (7–)10–15(–19) mm | (8–)11–18 × (6–)9–11 mm | (5–)6–16 × 4–9 mm | (7–)10–21(–25) × (5–)6–13 mm |
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| Indumentum of leaflets | Upper surface sparsely puberule, lower surface puberule | Upper surface sparsely puberule, puberule to sparsely pubescent; lower surface sparsely puberule, puberule to pubescent | Glabrous on both surfaces | Upper surface subglabrous to sparsely puberule, lower surface subglabrous, sparsely puberule to puberule | Upper surface subglabrous, lower surface subglabrous to sometimes sparsely puberule |
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| (fig. 3) | | | (fig. 8) | (fig. 9) |
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| Tuft of trichomes on the lower surface | Absent | Present, unilateral | Present to very rarely absent, unilateral, usually prolonged up to the 3rd basal pair of secondary nerves | Usually absent, inconspicuous when present | Usually present, unilateral, usually prolonged up to the 3rd pair of secondary nerves, sometimes inconspicuous |
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| Spike length and indumentum of rachis | (8–)12–14 cm; sparsely ferruginous-pulverulent, densely yellow-pubescent, rarely yellow-pubescent | 11–15 cm; rachis sparsely ferruginous-pulverulent and pubescent | (5–)6.5–8 cm; rachis sparsely ferruginous-pulverulent and pubescent | 8–14 cm; rachis sparsely ferruginous-pulverulent and yellow-pubescent to densely yellowpubescent | 6.5–7 cm; rachis nigrescent covered by a yellow-pubescent indumentum |
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| Calyx (lobes and indumentum) | Yellow-pubescent, lobes apiculate | Yellow-pubescent, lobes apiculate | Yellow-pubescent, lobes apiculate | Yellow-pubescent, lobes shortly apiculate | Yellow-pubescent and ciliate; lobes apiculate |
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| Corolla (shape, size and indumentum) | Campanulate, ca. 2 mm, 2/3 connate, | Tubular– campanulate, 2–2.5 mm, 2/3 | Campanulate, ca. 3 mm, 1/2 connate, tube sparsely | Tubular, ca. 2 mm, 2/3 connate, glabrous to | Tubular, ca. 2.5 mm, 2/3 connate, glabrous to |
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| subglabrous to sparsely pubescent at the tube, the central part of the lobes pubescent (the indumentum usually does not reach the edge) | connate, glabrous to subglabrous at the tube, yellow-pubescent near the apex of the lobes | pubescent, lobes yellow-pubescent | subglabrous at the tube, puberule to pubescent at the lobes | subglabrous at the tube, puberule at the lobes |
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| Stamens (length) | 3.5–4 mm | 3–5 mm | 4.5–6 mm | 3–5 mm | 3.5–4 mm |
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| Ovary indumentum | Sparsely puberule to glabrous | Glabrous | Not seen | Sparsely white-tomentose to white-tomentose, sometimes white-pubescent, rarely glabrous | Usually white-tomentose, sometimes sparsely white-tomentose |
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| Prophylls | Deciduous, yellow-pubescent | Late deciduous, pubescent | Deciduous, yellow-pubescent | Deciduous, yellow-pubescent | Deciduous, yellow-pubescent |
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| Fruit | Straight to very slightly curved, flat-compressed with prominent seeds, (6–)7–11 × 1–1.5 cm, valves not conspicuously nerved | Straight to slightly curved, subturgid with the seeds slightly prominent when ripe, 7–10 × 1.1–2.3 cm, valves not conspicuously nerved | Swollen at the base; straight to slightly curved, flat-compressed, usually with tenuous constrictions between the seeds, seeds slightly prominent, 4.2–8.5 × 1.2–1.5 cm, valves not conspicuously nerved | Not seen | Straight to slightly curved, flat-compressed with slightly prominent seeds, 5–8 × 1.2–1.5 cm, valves not conspicuously nerved |
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