Horsfieldia tristis
Content
Description
Tree 10-15 m.
Leaves membranous to thinly chartaceous, elliptic-oblong to lanceolate, 14-32 by 4-8.5 cm, base attenuate, apex acute-acuminate;
Inflorescences glabrous or with few scattered hairs up to 0.1 mm;
Fruits 4-8 per infructescence, ellipsoid, apex subacute, 1.5 by 1.2 cm, glabrous, drying blackish, without lenticels or tubercles;
Distribution
Asia-Tropical: Borneo present (Sarawak present); Sumatera (Sumatera present), E Coast of Tapanuli present, Lingga Arch present, S Kalimantan present, Singkep I present
Malesia: Sumatra (E Coast of Tapanuli), Lingga Arch. (Singkep I.), Borneo (Sarawak, S Kalimantan).
Taxonomy
1Horsfieldia tristis seems related to H.fulva, with similarly elongate male flowers; in H. fulva the leaves dry brown instead of olivaceous, the twigs brown (not pale brown), bark not cracking, inflorescences pubescent, and pedicels articulated. Dried specimens of H. tristis have yellowish twigs and pale, olivaceous leaves; twigs, leaves and inflorescences are almost completely glabrous.
2 Bunnemeijer 7100 (Singkep I.) differs in its thin leaves, not distinctly dull and wrinkled on upper surface, and in the broadly ellipsoid, almost globose, male buds; its androecium has a very broad apical cavity with a broad, almost flat base.