Leopoldinia Mart., Hist. Nat. Palm. 2: 58 (1824)

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  • Moderate, solitary or clustered, unarmed, pleonanthic, monoecious (Leopoldinia pulchra) rarely dioecious according to Spruce [1871] palms. Stems erect, covered with marcescent leaf sheath fibres, eventually becoming bare, internodes short, at the base of the stem with abundant adventitious roots. Leaves pinnate, marcescent; sheath with a triangular ligule-like projection opposite the petiole, densely tomentose, the whole expanding and drying into an elegant interwoven mesh of broad flattened fibres, the margins remaining entire, or the whole disintegrating into extremely long black fibre bundles (‘piassava’) which hang down and obscure the stem; petiole well developed, adaxially flattened or convex, abaxially rounded or ± angled, bearing abundant, caducous scales; rachis longer than the petiole, adaxially angled, abaxially rounded or flattened, scaly as the petiole; leaflets single-fold, linear, acuminate or minutely bifid, numerous, regularly arranged, somewhat plicate, concolourous or discolourous, adaxially glabrous, abaxially bearing ramenta along the midrib, particularly near the base, transverse veinlets conspicuous. Inflorescences interfoliar, solitary, much shorter than the leaves, branching to 4 orders, the whole densely brown-tomentose, staminate inflorescences alternating with pistillate, or proximal rachillae pistillate and the distal staminate, or each rachilla pistillate at base, staminate at the tip or, rarely, plants apparently dioecious; peduncle elongate, partially obscured by subtending leaf sheaths, narrow-crescentic in cross-section; prophyll borne considerably above the base, tubular, narrowly elliptical in outline, 2-winged, ± membranous, splitting down its entire length early in development, circumscissile near the base, leaving a low membranous collar; peduncular bract 1, like the prophyll, also early caducous; rachis usually much shorter than the peduncle; first-order branches rather slender, each subtended by a very small, low, membranous, triangular bract; second, third, and fourth-order branches slender, tending to be somewhat divaricate or sinuous; rachillae rather slender, very densely tomentose, the flowers partially immersed in tomentum, where pistillate flowers borne on separate rachillae, the rachillae more robust than the staminate, pistillate flowers apparently solitary or in triads, staminate flowers usually paired or solitary. Staminate flowers very small, ± globular, bearing a striate chaffy bracteole; sepals 3, distinct, rounded, imbricate, ± striate; petals 3, distinct, valvate, ± triangular-ovate, marked on adaxial face by impressions of anthers; stamens 6, very small, filaments very short, connate only at the very base, rather broad, ± inflexed at the tip, anthers ± oval in outline, latrorse; pistillode barrel-shaped. Pollen ellipsoidal, slightly asymmetric; aperture a distal sulcus; ectexine tectate, surface very finely granular, finely perforate, or perforate and slightly rugulate, aperture margin similar; infratectum columellate; longest axis 21–26 µm [1/3]. Pistillate flowers larger than the staminate; sepals 3, distinct, imbricate, rounded, ± hooded, the margins ± toothed; petals 3, distinct, valvate; staminodes 6, distinct, very small, short, flat and ± truncate; gynoecium trilocular, triovulate, ± pyramidal, stigmas 3, rather obscure, sessile, ovule form unknown. Fruit dull red at maturity, ovoid, slightly flattened laterally, or strongly lenticular or disciform, 1-seeded, developing from 1 carpel, perianth whorls persisting, stigmatic and sterile carpellary remains basal; epicarp smooth, mesocarp composed of several complex reticulate systems of thick anastomosing fibres, embedded in fleshy parenchyma, the fibres becoming more numerous and closer towards the centre of the fruit, endocarp thin, smooth internally. Seed rounded or lenticular, attached opposite the stigmatic remains, with a vertical hilum running across one of the lateral faces, endosperm homogeneous; embryo subbasal. Germination adjacent-ligular; eophyll bifid, the segments very slender. Cytology not studied. (J. Dransfield & N. Uhl & C. Asmussen & W.J. Baker & M. Harley & C. Lewis, Genera Palmarum. The evolution and classification of palms. 2008)A

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