R E I N W A R D T I A

Published by Herbarium Bogoriense, Kebun Raya Indonesia
Volume 1, Part 4, pp. 459-461 (1952)

NOTES ON NEW GUINEA PLANTS—IV*
Saccopetalum koolsii Kostermans, sp. nov. (Annonaceae)

A. J. G. H. KOSTERMANS**

During the exploration of the Momi-Ransiki region, about 80 km
south of Manokwari on the west coast of the Geelvink Bay in Netherlands
New Guinea in 1948, our party collected several specimens of a rather
common, although scattered Annonaceous tree, which was locally called
mies (pronounce: meece). I was lucky to find one tree in flower in the
neighbourhood of the Warnapi (war = river), north of Ransiki. After
examination the species appeared to belong to the genus Saccopetalum
Benn., hitherto unknown from New Guinea.

In honour of Dr. J. Kools,'at that time in charge of the Division of
Planning (nowadays Professor at the State Agricultural University
of Wageningen, The Netherlands), who took a lively interest in the
exploration of this area, this species is called:

Saccopetalum koolsii Kostermans, spec. nov.—Fig. 1.
Simillima est S. longipes Vidal, species Philippinarum Insularum, sed

nova species basi acuta folii, apice acuminato haud submucronulato, nervis
primariis paucioribus et foliis ramulisque glabris differt. Petala paenis-
sime glabra, alabastra autem pilosa.

Tree up to 32 m high with straight, up to 25 m long, clear bole of
40 cm diameter. Bark brown; living bark yellowish in cross section. But-
tresses wanting. Branches grey, rough, ridged longitudinally; branchlets
glossy, sulcate, slender, glabrous (in newly developed branchlets scattered,
minute hairs are present), grey-brown. Leaf bud acute, silky-pilose. Leaves
alternate, papery, glossy, concolorous, lanceolate to lanceolate-elliptical,
4—18 X 1.5—7cm, usually about 9 X 3cm; top acute; base acutish.
Midrib flattened above, prominent below; primary nerves (6—7 on each
side) slender, arcuate, slightly elevated on both surfaces; secondary veins
laxly reticulate, prominulous. Petioles thick, 2—4 mm long, transversally
fissured. Inflorescences on youngest, newly developed branchlets or on
those of the preceding period, 1—2-flowered; peduncles filiform, usually

*Part I-III of this series appeared in Bull. Bot. Gdns Buitenzorg III 18: 435-448.
1950.

**Botanist, Division of Planning, Forest Service of Indonesia. Published with
the permission of the Director, Division of Planning.

• — 459 —



460 REINWARDT1A [VOL. 1

FIG. 1

1952] KOSTERMANS: New Guinea plants—IV 461

not more than 5 mm long, minutely pilose. Pedicels up to 40 mm long,
filiform, glabrous or nearly so. Flower buds pilose. Flowers about 7 mm
long. Sepals ovate, 1 mm long, pilose, obtusish. Outer petals lanceolate,
acute, 2—3 mm long, patent, pilose; inner petals about 7 mm long, fleshy,
erect, ovate-obtusish, glabrous inside, the margin papillose-hairy, the
outside glabrous or with a few scattered, minute hairs, the base pocket-
shaped. Anthers many, sessile, oblong, 0.5—0.75 mm long. Carpels many,
pilose, with sessile stigma. Fruit unknown.

TYPE. — Kostermans 430.
DISTRIBUTION. — Thus for only known from the Momi-Ransiki region,

New Guinea, growing on rather dry and stony hills.
SPECIMENS EXAMINED. — NEW GUINEA. N e t h e r l a n d s N e w G u i n e a .

"Vogelkop": Momi, about 80 km south of Manokwari, alt. 10 m, sandy, stony soil,
ster., Aug., tree of 30 m with 21 m clear bole of 40 cm diam., Kostermans 227 =
bb.33432; Ransiki, 10 km north of Momi, ster., July, tree of 32 m with 25 m clear
bole of 40 cm diam., Suhanda & Ilham 17 = bb.33265; Warnapi, 8 km north of Ransiki,
flowers pale green, Sept., tree of 22 m with 14 m clear bole of 30 cm diam., Kostermans
U30 {type).

The genus is now represented in the Indonesian Archipelago by two
species. It may be easily distinguished from Saccopetalum horsfieldii Benn.
by its long and slender pedicels and its smaller flowers.

The timber is not very durable (class 4—5) ; its specific gravity varies
between 0.83 and 0.89 (data communicated by Mr. Oey Djoeng Seng of
the Forest Research Institute, Bogor).

EXPLANATION TO FIGURE 1

FIG. 1. Saccopetalum koolsii Kosterm.; a, branchlet with inflorescens and young
leaves, X 0.7; 6, branchlet with mature leaves, X 0,7; c, flower with foremost petal

removed, X 4.2. — Drawing after the collection Kostermans 430.


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