Cryptocoryne ×purpurea Rideley nothovar. borneoensis N.Jacobsen, Bastmeijer & Y. Sasaki

Although the occurrence of a C. ×purpurea like plant in Kalimantan (Indonesia) was reported many years ago, it was not until 1999 that Yuji Sasaki (Japan) brought such a plant home alive. In 2002 the plant was described as a new hybrid variety.

Click on the picture to get the full image (ca 50 k)

Brownish green, smooth to bullate leaves and a striking red limb of the spatha.
coll. Sasaki I-SASL2 (=SP2)
photo Sasaki
The surface of the limb is rather rough and there is a distinct collar.
coll. Sasaki I-SASL2 (=SP2)
photo Sasaki
Locality where C. ×purpurea nothovar. borneoensis is found. Note the low water level (clear banks).
coll. Sasaki SP2
photo Sasaki
Another picture of the locality near Sampit in South Kalimantan.
coll. Sasaki SP2
photo Sasaki
       
Lower part of the tube (kettle) of C. ×purpurea nothovar. borneoensis. The top of the kettle is densely spotted with red dots.
coll. Sasaki SP2
photo Sasaki
The upper part of the spadix with the male flowers. Note the purple top (appendix), as also seen in C. cordata var. grabowskii.
coll. Sasaki SP2
photo Sasaki
Another collection of C. ×purpurea nothovar. borneoensis.
coll. Sasaki SP3a
photo Sasaki
Probably, this plant must be regarded as another hybrid, also growing in South Kalimantan.
coll. Sasaki I-SAKK1
photo Sasaki
       
The plant from the Malay peninsula C. ×purpurea nothovar. purpurea may also have a rough surface of the limb, but does not have a collar.
coll. hort., cult. M
photo Möhlmann
C. ×purpurea nothovar. purpurea with a smooth surface of the limb.
coll. hort. cult. B14
C. cordata var.grabowskii from the region near Sampit. The limb is very dark.
coll. Idei B-03
photo Sasaki
Distribution of C. ×purpurea nothovar. borneoensis. Probably the hybrid is more widespread in Kalimantan.
       
The occurrence of C. ×purpurea like plants from Kalimantan is known from 1975 when P.M. Driessen writes in a letter to Prof. de Wit in Wageningen that he found a 'purpurea-like' plant near Tamiang Layang. He also shipped plants, but no results are mentioned by De Wit. It was not until Mr. Sasaki from Japan from 1999 did intensive research in the whole area, collecting Cryptocoryne. Of much importance is in this case that he also collected C. griffithii (not documented with plants from Kalimantan before) and C. zonata (very common in Kalimantan). The most exiting result was that he collected all three plants in one stream!  The Kalimantan plant differs from the plants from the Malay peninsula in having a a pronounced collar, a more or less purple zone in the upper part of the kettle and a purple colored appendix of the spadix. The surface of the limb of the spathe is rather rough, but this is also known for some Malay plants. As known for C. ×purpurea nothovar. purpurea from W. Malaysia, this plant is regarded as a hybrid between C. griffithii and C. cordata var. cordata  (Jacobsen 1982) because of the defect pollen and the fact that never fruits were observed. The Kalimantan plants also do have defect pollen. The chromosome number for the Kalimantan plant turns out to be 2n=51. The parents of  C. ×purpurea nothovar. borneoensis will be C. griffithii (2n=34) and C. cordata var. grabowskii (2n=68).
C. ´purpurea nothovar. borneoensis is rather easy in cultivation and may be useful for the aquarium.

Note. The '×' without blank between the epithet, indicates the hybrid status according to the International Code of Botanical Nomenclature, as do the use of the word 'nothovar.' for hybrid plant varieties.

Updated January 2003

Literature

Jacobsen, N. 2002. Der Cryptocoryne cordata Griffith - Komplex (Araceae) in Malesien. Aqua-Planta 27 : 150-151.
Jacobsen, N., J.D. Bastmeijer & Y. Sasaki, 2002. Cryptocoryne ×purpurea Ridley nothovar. borneoensis N. Jacobsen, Bastmeijer & Y. Sasaki (Araceae), eine neue Hybridvarietät aus Kalimantan. Aqua-Planta 27 : 152-154.