Hyospathe Mart., Hist. Nat. Palm. 2: 1 (1823)

Primary tabs

Discussion

Diagnosis

Biology And Ecology

Etymology

Description

  • Small or rarely moderate, solitary or clustering, graceful, unarmed, pleonanthic, monoecious palms. Stem slender, ringed with conspicuous, sometimes oblique, rather distant leaf scars. Leaves regularly pinnate, entire and bifid, or bi- or trijugate; sheath usually forming a short to long crownshaft, not splitting opposite the petiole until shed, margin irregular, chartaceous, striate, adaxially grooved, glabrous, abaxially with scattered scales; petiole moderate, slender, abaxially rounded, with hairs or deciduous scales; rachis adaxially ridged, abaxially ridged or rounded, also scaly; leaflets lanceolate to falcate, pointed, often somewhat curved apically, alternate, single-fold, several-fold or many-fold, bearing scattered deciduous scales along abaxial ribs and sometimes basally on adaxial ribs, laterally, tapering to a rather blunt point, chartaceous, splitting surfaces similar or dissimilar in colour, midrib prominent, 1–2 pairs of dorsiventrally and apically to become bifid, inserted above the base of the parallel veins also conspicuous in some species, transverse veinlets peduncle; peduncular bracts 1–2, terete, much longer than or about as long conspicuous or obscure. Inflorescence solitary, branched to 1 order, branches as the prophyll, beaked, splitting abaxially, inserted somewhat above the stiff or pendulous; peduncle short or long, slender; prophyll 2-keeled prophyll; rachis much shorter to rarely longer than the peduncle; rachis bracts very short, obscure, subtending spirally inserted rachillae; rachillae slender, rather distant or crowded, moderate to short and stiff or long and pendulous, sometimes undulate apically, bearing spirally arranged triads of flowers nearly throughout and paired to solitary staminate flowers distally; floral bracteoles shallow, rounded. Staminate flowers lateral to the pistillate, sessile or stalked, narrow, elongate; sepals 3, united in a tube, adnate basally for at least 2/3 their length to the receptacle to form a stalk-like base, free tips short, broadly triangular; petals 3, distinct, narrowly ovate, asymmetical, curved basally, pointed distally; stamens 6, the 3 antesepalous with shorter filaments, free or shortly joined with the pistillode, the 3 antepetalous with filaments much longer, adnate to the pistillode nearly to its apex, filaments awl-shaped, anthers moderately long, dorsifixed near the base, latrorse, united throughout; pistillode narrowly ovoid with 2 stigmatic lobes. Pollen ellipsoidal, with slight or obvious asymmetry; aperture a distal sulcus; ectexine tectate, finely or coarsely perforate-rugulate, aperture margin finer; infratectum columellate; longest axis 34–39 µm [1/17]. Pistillate flower ovoid, shorter than the staminate; sepals 3, united in a cupule for ca. 2/3 their length, tips broad, pointed, striate; petals 3, distinct, ovate, moderately imbricate, striate, tips pointed; staminodes 6, small, strap-like; gynoecium ovoid, unilocular, uniovulate, narrowed to a short tubular style, stigmas 3, recurved at anthesis, ovule basal, laterally attached, form unknown. Fruit ovoid to cylindrical, pointed, asymmetrical, black at maturity, stigmatic remains basal; epicarp smooth, lightly mottled, mesocarp fibrous, endocarp thin, crustaceous. Seed narrow, ovoid, ± pointed, hilum basal, raphe branches anastomosing, endosperm homogeneous; embryo rather large, basal. Germination adjacent-ligular; eophyll bifid. 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

Relationships

Taxonomic accounts

Use Record

Uses