R E I N W A R D T I A
Published by Herbarium Bogoriense, Kebun Raya Indonesia

Volume 5, Part 3, p.p. 319 - 321

JARANDERSONIA* Kosterm.
A new Bornean Genus of Tiliaceae — Brownlowieae.

A. J. G. H. KOSTERMANS**

Jarandersonia paludosa Kosterm., nov. gen., nov. spec. — Fig. 1.
Arbor mediocris foliis alternantibus petiolatis subtus lepidotis stipulis

conspicuis, inflorescentiis subterminalibus paniculatis lepidotis bracteatis,
floribus pedicellatis, calycis tubo 5 lobato, petalis 5 glabris calycem super-
antibus, staminibus numerosis liberis, antheris bilocellatis, thecis supra con-
fluentibus, staminodiis 5 ligulatis, ovario lepidoto, stylo distincto, stigmate
inconspicuo.

Small tree, 5 m high, 5 cm in diameter in peat swamp forest; branches
cylindrical, grey brown, covered by tiny non-fimbriate scales. Leaves alter-
nate, stiffly chartaceous or subcoriaceous, elliptical, up to 11 x 32 cm (those
near the inflorescence 6 x 15 cm); top acuminate, base rounded, above
glossy, smooth, main nerves impressed; lower surface densely covered by
coppery, non-fimbriate, tiny scales, midrib strongly prominent, lateral nerves
up to 20 pairs, rather patent, prominent, near margin arcuately anasto-
mosing; in between two lateral nerves a parallel one which runs out; the
lowest pair slightly ascendant; secondary nerves lax, prominulous. Petiole
stout, up to 2 cm. Stipules lanceolate, lepidote, acute, 1 cm long.

Inflorescences axillary near apex of branchlets, broadly paniculate,
coppery, roughly (loosely) lepidote, much branched, up to 13 cm long;
bracts large, the lower ones ovate, acute, 8 mm long, the upper ones at
base of the pedicel carinate, narrow, 4 mm long. Pedicel 3—4 mm. Calyx
lepidote (scales non fimbriate), tube shallow, lobes erect, ovate, acute, 6—7
mm long.

Petals pale pink, glabrous, spathulate, up to 12 mm long. Stamens
free, numerous; filaments slender, 8 mm, anther versatile with two separate
pollen sacks, spreading at base, confluent near apex, lengthwise dehiscent.
Between stamens and ovary a row of 5 ligulate, 5 mm long staminodes.
Ovary sessile, ovoid, densely lepidote; style glabrous, 3 mm, stigma inconspi-
cuous. Young fruit covered with a dense layer of slender spines.

TYPUS. — J. A. R. Anderson 6554 (K).
DISTRIBUTION. — Only known from type locality.

The genus belongs to the tribe Brownlowieae by its spreading and
at apex confluent anther cells and presence of a calyx tube. Because of

*) Named in honour of Mr. J. A. R. Anderson, Forestry Service, Sarawak, a well-
known student of the vegetation of peat swamps in Borneo.

**) D. Sc, Advisor Central Forest Research Institute, Bogor; Cooperator Herbarium
Bogoriense, Bogor; Professor of Botany, Institute of Technology, Bandung.

— 319 —



S20 REINWARDTIA vOL. 5

its 5 staminodia it comes near the Brownlowia group and nearest to Diplo-
discus, from which it differs by its spiny fruit.

The leaves resemble strongly those of Broivnlowia purseglovei.

BORNEO, S a r a w a k , Distr. Lundu, 3 miles up river from Lundu in peat swamp
forest, alt. ca 3 m , Aug., fl., young fr., J. A. R. Anderson G55U (BO, K, L, SING).



1960] A. J. G. H. KOSTERMANS: Jarandersonia 321

Fig. 1. — Jarandersonia paludosa Kosterm


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