Tropicos | Name - Pandanus halmaherensis Callm. & A.P. Keim

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Pandanus halmaherensis Callm. & A.P. Keim

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Project Name Data (Last Modified On 11/26/2013)

Acceptance : Accepted

References (Last Modified On 12/27/2021)

References:

Callmander, M. W., A.P. Keim, S. Buerki & P. B. Phillipson. 2015. The genus Pandanus Parkinson (Pandanaceae) on Halmahera Island (Moluccas, Indonesia) with descriptions of three new species and a key to the species on the island. Candollea 70(2): 179–195.

Taxonomy (Last Modified On 12/27/2021)

Taxonomy: Pandanus halmaherensis is notable in having a large and massive pendant infructescence and drupes with a prismatic-conic shallowly bullate pileus with a spinescent stigma, unlike any other known species of the genus.

Description (Last Modified On 12/27/2021)

Description: Tall tree to 10-20 m tall, trunk 15-25 cm in diam., with a large cone of proproots, 1-2(-5) m long, 6-7 cm in diam. Leaves linear-attenuate, mostly (180-)220-250(-300) cm long, 5-8 cm wide, apex gradually attenuate; sub-coriaceous to coriaceous, paler green abaxially shiny axially (especially when dry); longitudinal veins visible on both surfaces; marginal prickles borne 7-11(-15) cm above base to apex, antrorse, 1.5-2.5 mm long in the lower third, (1-)3-10 mm apart, (0.5-)1-2 mm long in the mid-third, 2-5 mm apart, to 0.5-1 mm long in the distal third, 0.2-0.5(-1) mm apart, subappressed to apressed in the distal third; midrib unarmed in the lower third, prickles < 0.5 mm long towards the apex, irregularly spaced but mostly 1-2 mm apart; prickles absent on apical ventral pleats; sheath (7-)11(-17) cm long, (7-)9-10 cm wide at apex, (8-)12-14(-19) cm at base. Infructescence terminal, pendant, red to purple, the solitary syncarp ovoid, (25-)30-35 cm long, 11-15 cm wide, peduncle (45-)50-80 cm long, c. 3 cm thick at apex, bearing foliaceous bracts, the proximal ones c. 60 cm long, the distal one 13 cm long, crowded at peduncle apex, spreading open at maturity. Drupes very numerous, crowded, (30-)35-40 mm long, 4-5 mm wide, 4-5 mm thick, 1-celled, 5-7-angled, linear, pileus prismatic-conic, 8-10 mm long, shiny, shallowly bullate. Stigma one, c. 6-8 mm long, spinescent, deflected toward the syncarp apex: stigmatic groove ventral (adaxial), running along the whole length of the stigma and extending in a groove on distal part of the pileus. Endocarp bony, basal, c. 8 mm long, flat at apex, lateral walls > 1 mm thick; proximal mesocarp 2-4 mm long, fibrous, distal mesocarp 15-25 mm long, sparsely fibrous, chambered, seed locule c. 5 x 3 mm, ellipsoid. Staminate inflorescence unkown

Distribution (Last Modified On 12/27/2021)

Notes: Pandanus halmaherensis is found at low to mid elevations (160-700 m) in primary and disturbed evergreen tropical forests. It grows on slopes and in open areas. The species is only known from the eastern and central part of Halmahera

Country: Indonesia

Regional: Moluccas

Provincial: North Moluccas