Beccariophoenix alfredii Rakotoarin., Ranariv. & J.Dransf.

국표에 없다.

General DescriptionRobust, solitary, unarmed, pleonanthic, monoecious, tree palm. Stem erect, to ca. 15 m tall, 28-30 cm diam. at breast height, graybrown, eventually becoming bare and closely ringed with leaf scars, internodes ca. 2.5 em. Leaves 30-36 in crown, pinnate, marcescent in juvenile palms, abscising neatly in adults; sheath tubular at first, to at least 82 cm long, with two lateral, ± entire, triangular lobes to 30 em long, 10 em wide at the base, tapering to ca. 8 em, the abaxial surface of the sheath covered with thick caducous gray-brown indumentum, the body of the sheath disintegrating into a mass of robust sinuous gray fibers ca. 3 mm wide, adaxially the sheath glabrous, reddish-brown; petiole very short, ca. 4-5 em long, to 8 x 2.3 em wide and deep, with scattered caducous scales; rachis to at least 4.4 m long, to 7 x 2.3 em wide and deep at the base, tapering gradually distally, adaxially ridged near the base, abaxially rounded, distally with 2 lateral grooves; leaflets ca. 120 on each side of the rachis, ± regularly arranged, very slender and crowded at the base, ± rigid or somewhat pendulous, ca. 47 x 1 em at the base of the leaf, ca. 112 x 4 em in mid leaf, ca. 65 x 1.8 em at the tip, ± acute, easily splitting and becoming bifid, adaxially glabrous, abaxially lacking powdery white wax, transverse veinlets short, conspicuos, minute punctiform scales present on longitudinal veins. Inflorescences solitary, infrafoliar, branching to 1 order; peduncle moderate, 8--13 em long, elliptic in cross-section, 4 x 1.7 em, with caducous gray-brown indumentum, ± glabrescent in infructescence; prophyll not seen, presumably inserted at the base of the peduncle and included within the leaf sheaths; peduncular bract inserted at the apex of the peduncle, woody, with solid beak, the whole to 90 em long, 3-5 mm thick, abaxially with conspiCUOUS longitudinal grooves, at anthesis the peduncular bract splitting longitudinally and circumscissile at the insertion, leaving a collarlike scar, the bract curling up on drying after abscission, adaxially the bract smooth, shiny, yellOWish green abaxially tomentose and longitudinally shallowly grooved; rachis very short, to 8--9 em long, to ca. 4 x 2 em diam., tapering to ca. 0.7 em at the tip, bearing ca. 30-50 crowded, spirally arranged rachillae, each subtended by a short, triangular, acuminate, coriaceous bract 1.1-7.5 x 1.0-2.8 em; rachillae glabrous and lacking white wax, yellOWish, becoming crimson in ripe fruit, straight, rigid, held at a narrow acute angle to the rachis, 45-66 em long, ca. 5-8 mm diam. at the base, tapering distally, each with a poorly defined swelling at the very base, proXimally with a bare portion 15-18 em long, distally bearing distichous triads in the proximal 13-19 em, paired staminate flowers in the middle 11-17 em and solitary staminate flowers in the distal 13-18 em, rachilla bracts triangular 1-4 x 1-6 mm; floral bracteoles well developed, broad, rounded, striate, rather coriaceous, shorter than the rachilla bracts. Staminate flowers narrow ellipsoid, ca. 13 x 4 mm; sepals to 2 x 2 mm, joined in the basal 1 mm, distally triangular, free and imbricate, glabrous, not striate; petals coriaceous, ca. 12 x 3 mm, tapering to a short acute tip, basally very briefly joined, abaxial surface glabrous, lacking white wax, obscurely striate; stamens 15, filaments 2 mm, anthers elongate 8 x I mm, erect, ± basifixed; pistiIJode absent. Pollen not studied. Pistillate flowers in bud, irregularly globose to obscurely angled, 9 x 6 mm, perianths persistent and enlarging in frUit; sepals broadly imbricate, 8-9 x 5-6 mm; petals 8 x 7 mm, broadly imbricate with short valvate tips; staminodal ring membranous, ca. 1 mm high; gynoecium ellipsoid, 6 x 4 mm, stigmas pyramidal in bud, 2 mm high. Fnlit I-seeded, oblate, 16 x 24 mm, with a short triangular beak to 3 mm long, 4 mm wide at the base, dark purplish-black at maturity, smooth, becoming striate when dry, surface glabrous except the beak where minutely and obscurely scaly; mesocarp thin, fleshy 1 mm thick, with longitudinal fibers, endocarp 15 x 22 mm, very thin, scarcely lignified, pores rather obscure, just below the equator. Seed oblate 13 x 20 mm, attached near the base with a broad hilum, with numerous anastomosing raphe branches, endosperm deeply ruminate; embryo lateral below the equator. Germination: adjacent-ligular; eophyll entire, lanceolate.

Beccariophoenix alfredii Rakotoarin., Ranariv. & J.Dransf. | Plants of the World Online | Kew Science

 

Beccariophoenix alfredii Rakotoarin., Ranariv. & J.Dransf. | Plants of the World Online | Kew Science

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