Burretiokentia Pic.Serm., Webbia 11: 122 (1955)

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Description

  • Moderate to large, solitary, slender, unarmed, pleonanthic, monoecious palms. Stem erect with prominent nodal scars, green or brown, often slightly expanded basally, prickly adventitious roots sometimes present. Leaves regularly pinnate, spreading; sheaths tubular, usually forming a prominent crownshaft, more rarely split opposite the petiole, covered with scales or tomentum, obliquely lined; petiole short, shallowly channelled adaxially, rounded abaxially, margins sharp, densely scaly or minutely dotted; rachis angled adaxially, rounded abaxially, scaly or minutely dotted on both surfaces; leaflets stiff, acute, single-fold, 1(–2) lateral veins on each side prominent adaxially, the midrib and numerous veins prominent abaxially, densely scaly when young, becoming dotted in age, ramenta usually abundant along ribs, transverse veinlets not evident. Inflorescences infrafoliar, branched to 1(–2) orders, protandrous; peduncle short; prophyll incompletely encircling the peduncle at insertion, open abaxially, caducous; peduncular bract thin, inserted close to and not much exceeding the prophyll, completely enclosing the inflorescence in bud, also caducous; rachis angled, longer than the peduncle, bearing low bracts subtending glabrous to densely tomentose branches and rachillae; rachillae appearing rather stout, arching and spreading, bearing spirally arranged, low, rounded, somewhat spreading bracts subtending triads in the lower 1/2–2/3 of each rachilla and paired or solitary staminate flowers distally; bracteoles surrounding the pistillate flower prominent, nearly equal, sepal-like, exceeding the subtending bract. Staminate flowers not at all or slightly to markedly asymmetrical, often developing well before the pistillate buds or these abortive and the inflorescence wholly staminate; sepals 3, distinct, imbricate, rounded, and the outer usually keeled dorsally; petals 3, distinct, valvate, about twice as long as the sepals, drying lined; stamens 6, filaments flattened, of uniform width or tapered distally from a broad base, inflexed at the apex in bud, anthers dorsifixed, briefly bifid at the apex, bifid nearly 1/2 their length basally, the connective dark, each locule with a central sterile connective-like area marked with included raphides; pistillode ca. 1/2 as long as the stamens or a little more to equalling them in bud, trilobed, sometimes deeply so, not much expanded at apex. Pollen ellipsoidal asymmetric; aperture a distal sulcus; ectexine tectate, psilate and sparsely perforate, aperture margin similar; infratectum columellate; longest axis 43–65 µm [2/2]. Pistillate flowers shorter than the staminate; sepals 3, distinct, broadly imbricate; petals 3, distinct, not much longer than the sepals, imbricate except for the briefly valvate apices; staminodes 3, tooth-like, borne at one side of the gynoecium; gynoecium unilocular, uniovulate, ovoid, stigmas 3, recurved, ovule pendulous, hemianatropous. Fruit globose to ellipsoidal, green when immature, becoming red at maturity, smooth when fresh, pebbled and usually irregularly shouldered and angled when dry, the stigmatic remains apical or eccentrically apical; epicarp thin, mesocarp with a dense layer of elongate, oblique sclereids over a densely tanniniferous layer and a few flat, longitudinal fibres against the endocarp, endocarp irregularly sculptured, with an adaxial keel and an abaxial groove between lateral ridges, operculum basal, rounded. Seed irregular, sculptured like the endocarp, hilum linear, lateral, endosperm homogeneous; embryo 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

Anatomy

Fossil record

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