C. ×batangkayensis Ipor, Ørgaard & N. Jacobsen

Already in 2004 Isa Ipor found an unknown Cryptocoryne in Western Sarawak what looked somewhat like C.×purpurea nothovar. purpurea from the Malay peninsula and gave it the working name "nothovar. sarawacensis" This latter plant proved to be a natural hybrid between C. cordata var. cordata and C. griffithii and is fully sterile. As var. cordata does not grow in Borneo at all, the close related C. cordata var.grabowskii could replace, but C. griffithii is only known from southern Borneo and is not reported from Sarawak.
so it could not be

polled defect - hybrid with ??
2n=85?

as a hybrid between C. cordata var. grabowskii and C. ferruginea var. ferruginea.

 

A stream near Bau with a big stand of C. ×batangkayensis
photo Jacobsen
A close up of the same stream
photo Jacobsen
Another close up
photo Ipor
Ipor standing at the stream. Note
photo Wongso
       
ass
coll. NJS04-07c, cult. Jacobsen
photo Jacobsen
ass
coll. NJS04-07c, cult. Jacobsen
photo Jacobsen

asa
as

photo Ipor

artificial hybrid between xxxxxx Jacobsen CyCy447 fer X gra

photo Jacobsen

       

Cultivated
coll. Ipor IBI06-1
photo Jacobsen

Cultivated
coll. Karlick Sara3, cult. SR396
photo Reitel
ass
coll. NJS04-07c, cult. Jacobsen
photo Jacobsen
C.×batangkayaensis known from one stream in Sarawak
       

Cultivating half submersed is relative simple on a bottom of Fagus leaves.

literature:

Ipor, I.B., Ørgaard, M & Jacobsen, N., 2015. Cryptocoryne ×batangkayensis (Araceae), a new hybrid from Sarawak. Willdenowia 45: 183 - 187. (Document service)
Jacobsen, N., J.D. Bastmeijer, I. Ipor, K.R. Munk, S. Wongso & M. Orgaard, 2016. Cryptocoryne ×batangkayaensis (Araceae) und Bemerkungen zu einigen anderen Hybriden. Aqua Planta 41:2: 54-66 (with English tranlation). (Document service)_

July 2017