From the Phytotaxa publication, “Three new species, one new record and an updated checklist of Begonia (Begoniaceae) from Kalimantan, Indonesia” by AGUSTI RANDI , WISNU H. ARDI, DEDEN GIRMANSYAH, BINA SWASTA SITEPU & MARK HUGHES. 

“Endemic to Borneo, widespread in the western part of the Muller Mountains… Humid areas near rivers or narrow valleys under a dense canopy of mixed dipterocarp forest at 100– 300 m elev…The epithet refers to the name of regency where this species was found, Kapuas Hulu. Provisional Conservation Status:—Near threatened (NT) (IUCN, 2019). This species is observed in seven localities and locally abundant in the western part of Muller Mountains…. Notes:—Unlike most other erect species of Begonia sect. Petermannia in Borneo, B. kapuashuluensis has a very short stem not exceeding 20 cm tall. Apart from its small size, B. kapuashuluensis is distinctive in having deep bluish green leaves which are light red to crimson beneath, often with a small cauline leaf at the first branch.”