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