xi, c, 2 Merrill: Notes on the Flora of Borneo 69 
fascicles occur. The specimens appear to be different from Javan material 
supposed to represent the same species, but the differences may be due 
mostly, if not entirely, to the abnormal inflorescences, probably caused by 
insects. 
MACARANGA Thouars 
MACARANGA INSIGNIS sp. nov. § Caladiifoliae. 
Arbor parva, glabra, ramulis teretibus, crassis, laevis, pruino- 
sis, cavis; foliis longe petiolatis, glabris, usque ad 40 cm longis, 
basi late peltatis, 7- vel 9-nerviis, late rotundatis ve! truncatis, 
profunde palmatim 5-lobatis, lobis oblongis ad oblongo-lanceola- 
tis, caudato-acuminatis, integris; inflorescentiis $ axillaribus, 
pedunculatis, subcapitatis, bracteis magnis pruinosis persisten- 
tibus suffultis, floribus dense confertis, staminibus 5 vel 6; 
floribus $ dense confertis, ovario cupreo- vel ferrugineo-furfura- 
ceo ; capsulis 5-locularis, extus laevis. 
A small glabrous tree, the branchlets cylindric, smooth, prui- 
nose, 6 to 10 mm in diameter, hollow, perforated, and inhabited 
by ants. Leaves coriaceous, glabrous, broadly ovate in outline, 
very deeply palmately 5-lobed, up to 40 cm in length, shining, 
peltate ; base very broadly rounded or truncate, sometimes 
slightly undulate, sometimes with a very few minute teeth, the 
basal lobes spreading or slightly falcate, 8 to 11 cm long, much 
shorter than the three central lobes, the petiole inserted 6 to 7 
cm from the margin ; upper three lobes oblong to oblong-lanceo- 
late, 5 to 10 cm wide, caudate-acuminate, entire or distantly and 
minutely denticulate, the sinuses extending to within 3 to 7 cm 
of the insertion of the petiole ; nerves 7 or 9, palmate, very pro- 
minent ; petioles pruinose, 25 to 40 cm long. Male inflorescences 
axillary, solitary, their pruinose peduncles up to 7 cm in length, 
the inflorescence dense, subcapitate, 2 to 3 cm in diameter, 
ovoid ; bracts coriaceous, ovate to ovate-lanceolate, concave, 
curved, acuminate, 1.5 to 2.5 m long, pruinose, persistent. Male 
flowers very numerous, very densely crowded on the short 
branches, subtended, and more or less covered, by the bracts. 
Calyx externally slightly puberulent. Stamens 5 or 6; anthers 
3- and 4-celled. Female inflorescence similar to the male, but 
the bracts apparently not persistent. Flowers crowded. Ovary 
cupreous- or ferrugineous-furfuraceous, smooth, ovoid, mostly 
5-celled. Capsules depressed-globose, pedicelled, when dry about 
1 cm in diameter, the valves longitudinally sulcate when dry, not 
appendaged, glabrous or somewhat furfuraceous. 
Sarawak, Native collector 169 (type), 171, 1156, 1509 (Bur. Sci.). 
A remarkable species on account of its leaf characters, its dense 
inflorescences, and its symbiosis with ants. It is intermediate between 
the sections Pachystemon and Caladiifoliae, but on account of its anthers 
