Nannorrhops H.Wendl., Bot. Zeitung (Berlin) 37: 147 (1879)

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Number of Taxa

  • 1 species

Discussion

  • Distinguished vegetatively by the dichotomously branching stems and large bluish-grey leaves that lack a hastula. Developmental studies of the flowers (Uhl 1969a) have shown that connation of carpels begins in the styles at a relatively late stage in ontogeny, suggesting parallels with members of the Livistoninae in which carpels are connate by styles only. (J. Dransfield, N. Uhl, C. Asmussen, W.J. Baker, M. Harley and C. Lewis. 2008)

Biology And Ecology

Etymology

Diagnosis

Description

  • Moderate, shrubby, clustered, unarmed, hapaxanthic, hermaphroditic palm. Stems branched, prostrate or erect, branching in prostrate stems axillary, in erect stems dichotomous. Leaves induplicate, briefly costapalmate, marcescent; sheath splitting both below and opposite the petiole, brown, woolly tomentose and margins becoming frayed; petiole elongate, shallowly channelled adaxially, rounded abaxially; hastulae absent; blade regularly divided into stiff, glaucous, single-fold segments, further divided by abaxial splits, intersegmental filaments conspicuous, midribs prominent abaxially, transverse veinlets obscure. Inflorescences above the leaves, compound, composed of branches equivalent to the axillary inflorescences of pleonanthic palms, each branch subtended by a leaf with reduced blade or by a tubular bract, and branched to the fourth order; prophyll tubular, 2-keeled; peduncular bracts 0 to several, similiar; bracts subtending first-order branches tubular, tips pointed, each first-order branch with a basal, tubular, 2-keeled, empty prophyll; bracts subtending second-order branches tubular; rachillae bearing conspicuous tubular bracts, variously tomentose, each subtending a flower group. Flowers very short pedicellate, in a condensed cincinnus of 1–3(–7) flowers, each flower bearing a minute tubular bracteole; calyx thin, tubular at the base with 3 triangular lobes; corolla with a short stalk-like base and 3 distinct lobes, imbricate in the proximal 2/3, valvate in the distal 1/3; stamens 6, distinct, the antesepalous with free filaments, and the antepetalous with filaments adnate at the base to the petals, filaments awl-shaped, inflexed at the tip, anthers elongate, versatile, latrorse; carpels 3, connate except at the very base, ovary distinctly 3-grooved, style single, stigma scarcely differentiated, ovule anatropous, attached ventrally and basally. Pollen ellipsoidal, usually slightly asymmetric; aperture a distal sulcus; ectexine tectate, reticulate or foveolate-reticulate, aperture margin psilate or scabrate; infratectum columellate; longest axis 30–39 µm [1/1]. Fruit subglobose to ellipsoidal, 1-seeded, stigmatic remains basal; epicarp smooth, mesocarp fleshy, endocarp thin. Seed globose to ovoid, with very shallow grooves corresponding to the rapheal bundles, hilum basal, endosperm homogeneous, usually with a small central hollow; embryo basal. Germination remote-ligular; eophyll undivided. Cytology: 2n = 36. (J. Dransfield, N. Uhl, C. Asmussen, W.J. Baker, M. Harley and C. Lewis. 2008)

Anatomy

Relationships

Fossil record

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.