A A A A A

14. A

RECA MANDACANII H EATUBUN Areca mandacanii Heatubun, Palms 52: 199 2008. Type: I NDONESIA , West Papua Province, Sorong Selatan, Teminabuan, Sayal, Maampou Forest, ii.2003, Heatubun 423 holotype: BO; isotypes: K, MAN. Distribution: New Guinea Bird’s head peninsula in western New Guinea.

15. A

RECA MONTANA R IDL . Areca montana Ridl., Mat. Fl. Malay. Penins. 2: 136 1907. Type: M ALAY P ENINSULA , Selangor, Semangkok pass, 1.iii.1905, Burn-Murdoch s.n. holotype: SING. Areca latiloba Ridl., J. Straits Branch Roy. Asiat. Soc. 86: 310 1922. Type: M ALAY P ENINSULA , Negeri Sembilan, Bukit Tangga, Mountain forest, 800 m, Ridley s.n. holotype: K. Areca recurvata Hodel, Palm J. 134: 28 1997. Type: T HAILAND , SW of Narathiwat, 800 m, Hodel Vatcharakorn 1634 holotype: BK. Distribution: Thailand, Malay Peninsula, Sumatra and Java.

16. A

RECA OXYCARPA M IQ . Areca oxycarpa Miq., Verh. Kon. Ned. Akad. Wetensch. Afd. Natuurk. 11: 1 1868. Type: C ELEBES , Menado, Mt. Pisah, Riedel s.n. holotype: L. Areca celebica Burret, Repert. Spec. Nov. Regni Veg. 32: 115 1933. Type: C ELEBES , Tomohon, Sarasin s.n. holotype: B. Distribution: Celebes Sulawesi.

17. A

RECA PARENS B ECC . Areca parens Becc., Philipp. J. Sci. 14: 307 1919. Type: T HE P HILIPPHINES , Luzon, Camarines, iv.1914, Penas, Soriano Abellanosa F.B. 21712 holotype: FI. Distribution: The Philippines.

18. A

RECA RHEOPHYTICA J. D RANSF . Areca rheophytica

J. Dransf., Kew Bull. 39: 18 1984.

Type: B ORNEO , Sabah, Telupid, 23.x.1979, Dransfield et al. JD 5780 holotype: K; isotypes: L, SAN. Distribution: Borneo.

19. A

RECA RIPARIA H EATUBUN SP . NOV . F IG . 3 Type: C AMBODIA , Province Koh Kong, Tatai Chveng waterfall, less than 20 m, 27.ix.2008, Evans 174 holotype: K. Diagnosis: Ad subgenerum Arecam pertinens, a ceteris speciebus Cambodianis distinctissima; A. rheophytica J. Dransf. Borneensi similis, sed palma caespitosa et staminibus 3 differt. Description: Clustering, unarmed, monoecious, pleonanthic, small tree palm. S TEM to 2.5 m tall, 1 −1.5 cm diam.; internodes 2.5−3 cm long, green near the crown, shiny, brown near the base, nodal scars conspicuous, white to whitish brown. L EAVES about 7 in the crown, pinnate, to 80 cm long including petiole; sheath tubular, c. 19 × 4 cm long, smooth, greenish cream; crownshaft well defined, 28 −30 cm long and 1−2 cm diam.; petiole short, 12 −13 cm long, 5 × 5 mm at the base, channelled adaxially, rounded abaxially; rachis somewhat arching, very slender with adaxial longitudinal ridge, rounded abaxially; blade with regularly arranged leaflets, about 25 leaflets on each side; leaflets somewhat arching, single fold, linear, 20 −30 cm long, acuminate, with pointed tips, papery, green adaxially and light green abaxially, slightly discolorous when dried; continuous white woolly ramenta present along the mid-ribs on abaxial surface. I NFLORESCENCE infrafoliar, erect, small and slender, 13 −15 cm long and 6−8 cm wide, protandrous, branching to 1 order and sometimes the basalmost rachilla branches to 2 order; peduncle 1 −1.5 cm long; prophyll c. 14 × 4.5 cm, lanceolate, 2-keeled, papery, cream coloured, entirely enclosing the inflorescence, then splitting longitudinally and falling before staminate flower anthesis; rachis cream to greenish; rachillae numerous, divaricate, elongate, yellowish, usually with a basal triad, rarely with several triads, otherwise bearing paired staminate flowers in a single row on one side. S TAMINATE FLOWERS