Much resembling plants of B. grandiceps Jacq. except young branches glabrous or subglabrous, variable as regards size (e.g. stipules 7-16.5 cm long; racemes 14-20 cm in diam. during anthesis, the peduncle and rachis 3-6 cm) and tinge of petals from crimson to cherry-red.
Asia-Tropical: Jawa (Jawa cultivated); Philippines (Philippines cultivated); Sumatera (Sumatera cultivated)
This hybrid is of unknown origin and uncertain descent. Cultivated in some places in Sumatra, Java, and the Philippines.
Backer (l.c.) described and validly published this hybrid species of uncertain descent. Later he and Bakhuizen van den Brink f. (l.c.) stated that "B. grandiceps is probably one of the ancestors."