Iguanura Blume (1838: 66)

Henderson, Andrew, 2025, A revision of Iguanura (Arecaceae, Arecoideae, Areceae), Phytotaxa 690 (2), pp. 135-188 : 144

Iguanura Blume (1838: 66) . Type:— Iguanura leucocarpa Blume

Slackia Griffith (1845: 468) . Type:— Slackia geonomiformis (Martius) Griffith

Stems 1.2(0.01–4.0) m long, 1.0(0.4–3.0) cm diameter, solitary or clustered. Leaf sheaths 11.2(4.0–31.0) cm long, open and more or less persistent, not cleanly falling, or tubular, mostly closed opposite the petiole, cleanly falling, or swollen, mostly open opposite the petiole, cleanly falling, initially covered with dense, woolly indumentum or covered with a thin layer of indumentum; ocreas well-developed, separating early into fibers and disintegrating, or scarcely developed; petioles 16.5(1.0–150.0) cm long; rachises 43.9(13.5–160.0) cm long; leaf blades divided or undivided, not rounded at the apex, with a deep split, or rounded at the apex, with a shallow or absent split; leaf veins parallel or diverging; adaxial leaf veins prominent, rectangular in cross-section or not prominent, triangular in cross-section; pinnae 4(1–27) per side of rachis; middle pinna 23.1(10.0–49.0) cm long, 4.8(0.7–12.0) cm wide. Inflorescences spicate or branched to 1 or 2 orders; prophylls and peduncular bracts inserted close together at base of peduncle and both early deciduous before anthesis, or inserted some distance apart, more or less persistent; peduncles 22.5(1.0– 104.0) cm long, densely reddish-brown, wooly tomentose or not wooly tomentose; rachises 3.1(0.0–25.0) cm long; rachillae 4(1–35), 19.0(4.0–66.0) cm long, 2.1(0.5–5.4) mm diameter, on branched inflorescences not diverging from rachis, the proximal, adaxial rachilla surfaces flat, lying close to the flat rachis surface or widely diverging from the rachis, proximal part of rachillae with markedly distantly spaced triads or not with distantly spaced triads, glabrous or sparsely to densely tomentose, filiform with superficial, distantly spaced triads or not filiform with triads sunken in shallow, more or less closely spaced pits; rachilla bracts elongate, acuminate, densely tomentose at apex or not elongate; distal triad bracteoles well-developed or scarcely developed or absent; distal part of flower pits densely tomentose or glabrous; staminate flowers 2.0– 2.5 mm long with blunt apices or 4.0–5.0 mm long with pointed apices; anther margins undulate or not undulate; fruits 12.3(7.7–20.1) mm long, 6.7(3.6–11.3) mm diameter, ellipsoid, or oblong, apiculate, or obovoid, bilobed at apex, or narrowly ovoid, often curved, sometimes curved over at apex, ridged or not ridged, the surfaces drying smooth or pebbled, cream, white, whitish-yellow, yellow, yellowish, light yellow, pink, powder pink, pinkish, rose-pink, pinkish-red, red, reddish, light red, bright red, dark red, red-orange, reddish-orange, crimson, orange, purplish, purplish-red, or black; endocarp circular, or polygonal, or semicircular in cross-section; endosperm homogeneous or ruminate.