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A new species, Cryptocoryne tirtadinatae, from the Schwaner mountains West Kalimantan, Indonesia is described and illustrated. It differs significantly from all other Cryptocoryne species by the short leathery leaves, with the leaf blades shining green–purple pinkish with green markings on the upper surface, and the short spathe with a reddish limb and red spotted tube opening. The chromosome number 2n = 24, is the first report of this number for the genus.

A new species, Cryptocoryne aura Wongso & Ipor, from West Kalimantan, Indonesia, is described and illustrated. It differs from other Cryptocoryne species primarily by having a transparent, ciliate membrane along the leaf margin and a short spathe with a yellow, forward-twisted limb. It has a chromosome number of 2n = 26, which has not hitherto been recorded within the genus. The morphology of the germinating seed is unique within the genus, the embryo emerging c. ⅓ from the distal end of the seed with 3(or 4) plumulary processes (prophylls). Citation: Wongso S., Ipor I. B., Tawan C. S., Budianto H., Bastmeijer J. D. & Jacobsen N. 2016: Cryptocoryne aura (Araceae), a new species from West Kalimantan, Indonesia. — Willdenowia 46: 275–282. doi: http://dx.doi.org/10.3372/wi.46.46209 Version of record first published online on 28 July 2016 ahead of inclusion in August 2016 issue.

The South-East Asian genus Cryptocoryne has been shown to hybridize more frequently than expected. Data are presented on the known naturally occurring hybrids including information on their discovery, naming, and recognition as hybrids. Many artificial hybrids produced over the years indicate that there are only relatively few barriers to crossing. A heterosis effect is prevalent in many encountered Cryptocoryne hybrids. Vegetative propagation is clearly an advantage in the establishment of hybrid populations and also in detecting the hybrids, since inferior hybrids have disappeared naturally. Our results on Cryptocoryne also suggest that when the South-East Asian floras become as well-known as temperate ones, the number of natural hybrids will be similar to those presently known from temperate regions.

Jacobsen N., Bastmeijer J. D., Edwards P. J., Johns R. J., Takahashi N. & Wongso S.: A new variety of Cryptocoryne versteegii (Araceae) from Irian Jaya Tengah, Indonesia. — Willdenowia 44: 385–391. 2014. — Version of record first published online on 10 November 2014 ahead of inclusion in December 2014 issue; ISSN 1868-6397; © 2014 BGBM Berlin-Dahlem. DOI: http://dx.doi.org/10.3372/wi.44.44308 A new variety, Cryptocoryne versteegii var. jayaensis N. Jacobsen, Bastm., P. J. Edwards, R. J. Johns, N. Takah. & Wongso, from the base of Mount Jaya, Irian Jaya, Indonesia, is described and illustrated. Cryptocoryne versteegii Engl. var. versteegii is a plant from the inner mangrove with short, almost triangular, stiff, rather upright leaves, whereas var. jayaensis from fresh water has rather flaccid leaves, which are 2–4 times as long as those of var. versteegii.

Five new species and one new variety of Cryptocoryne (Araceae) from the Schwaner mountains (W Kalimantan) and the Muller mountains (W and C Kalimantan) are described. These new taxa makes a very interesting and unique addition to the genus Cryptocoryne. Two of the species have surprisingly low chromosome numbers: C. bastmeijeri with 2n = 14 and C. isae with 2n = 10. A key to the Cryptocoryne taxa of Borneo is provided.Citation: Wongso S., Bastmeijer J. D., Budianto H., Ipor I. B., Rysbjerg Munk K., Orgaard M. & Jacobsen N. 2017: Six new Cryptocoryne taxa (Araceae) from Kalimantan, Borneo. — Willdenowia 47: 325–339. doi: https://doi.org/10.3372/wi.47.47314Version of record first published online on 23 November 2017 ahead of inclusion in December 2017 issue.