Nephrosperma Balf.f., Fl. Mauritius : 386 (1877)

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Number of Taxa

  • 1 species

Discussion

Biology And Ecology

Etymology

Diagnosis

Description

  • Moderate, solitary, spiny when young, unarmed or only very sparsely armed when mature, pleonanthic, monoecious palm. Stem erect, becoming bare, conspicuously ringed with leaf scars, unarmed. Leaves pinnate, neatly abscising; sheaths tubular, becoming open, not forming a well-defined crownshaft, densely tomentose, bearing abundant, black spines in juveniles, ± unarmed or very sparsely armed in mature individuals, sheath margin irregularly ligule-like, tattering; petiole well developed, adaxially channelled, abaxially rounded, bearing white indumentum and scattered scales, and few bristles near the base; rachis curved; leaflets rather regularly arranged, neatly curved, distant, composed usually of 2–3 folds, acute or acuminate, adaxially glabrous, abaxially with numerous, minute, dot-like scales and abundant ramenta along the adaxial ribs, transverse veinlets obscure; expanding leaf flushed red. Inflorescences solitary, interfoliar, branching to 1 order only, protandrous; peduncle very long (± 1/2 the length of the leaves or more), erect at first, becoming curved, winged at the base, ± oval in cross-section, unarmed, scaly; prophyll inserted near the base of the peduncle, persistent, coriaceous, tubular, 2-keeled, the wings tending to be irregularly split or toothed, splitting apically for a short distance, covered with rather dense scales and scattered white wax, armed with short weak bristles and spines or rarely unarmed; peduncular bract, inserted a short distance from the prophyll, elongate, with a conspicuous long beak, tubular at first, then splitting along its length, deciduous, scaly and spiny as the prophyll; rachis shorter than the peduncle, scaly, bearing rather lax, spirally arranged rachillae; rachis bracts minute; rachillae scaly, with a pronounced swelling and bare section at the base, very long, spreading, slender, bearing distant, spirally arranged, superficial triads throughout, except at the tip where bearing solitary or paired staminate flowers; floral bracteoles minute. Staminate flowers symmetrical; sepals 3, distinct, imbricate, rounded, irregularly splitting, keeled; petals about 3–4 times as long as the sepals, 3, distinct, valvate, ± boat-shaped; stamens ca. 40–50, filaments elongate, anthers very small, rounded, with a broad connective, not versatile, latrorse; pistillode ovoid, conspicuous, minutely but clearly trifid at its tip. Pollen ellipsoidal asymmetric, occasionally elongate or pyriform; aperture a distal sulcus; ectexine tectate, finely perforate-rugulate, aperture margin similar; infratectum columellate; longest axis 35–43 µm [1/1]. Pistillate flowers globular; sepals 3, distinct, imbricate, low, ± rounded, thick, tending to split irregularly; petals 3, distinct, imbricate, ± rounded, with short triangular, valvate tips; staminodes 6, small, tooth-like; gynoecium ± obpyriform, unilocular, uniovulate, with minute apical stigmas, ovule laterally attached, form unknown. Fruit relatively small, spherical to somewhat kidney-shaped, red, perianth whorls persistent, stigmatic remains lateral; epicarp shiny, smooth, mesocarp thinly fleshy with a layer of slender fibres next to the endocarp, endocarp very thin, cartilaginous, with a thin, ± rounded operculum. Seed ±globose, somewhat kidney-shaped, attached laterally near the base, with an oblong hilum, raphe branches distant, slightly embedded in the endosperm, endosperm deeply ruminate; embryo basal. Germination adjacent-ligular; eophyll bifid. Cytology: 2n = 32. (J. Dransfield, N. Uhl, C. Asmussen, W.J. Baker, M. Harley and C. Lewis. 2008)

Anatomy

Relationships

Uses

Bibliography

  • Dransfield, J. , Uhl, N. , Asmussen, C. , Baker, W.J. , Harley, M. & Lewis, C. 2008. Genera Palmarum. The evolution and classification of palms. Kew Publishing, Royal Botanic Gardens Kew.