KEY TO THE SUBSPECIES

1	Twigs towards the apex 2.5-4.5 mm diam. Leaf blades 8-18 by 3.5-7 cm. Male inflorescences 2-5 cm long, the flowers often with ± reflexed pedicel; thecae 6-12.a. Horsfieldia xanthina subsp. xanthina
1'	Twigs stouter, towards apex 3.5-6 mm diam. Leaf blades 22-35 by 7-13 cm. Male inflorescences 10-20 cm, flowers erect; thecae 14 or 16. Horsfieldia xanthina subsp. macrophylla