By dint of googling (only 9 hits for the word as printed) and my amazing linguistic truffle-hunting skills (I combined the "Malay" in the quoted passage with what appeared to be Malay text in some of the Google results and took out my Malay dictionary), I discovered that the word should be lengkuas, a Malay word for the spice whose Linnean name is Alpinia galanga.    From Wordnik.com.  [languagehat.com: LENGKUA/GALANGAL.] Reference

"Su'úd," an Alpinia with pungent rhizome like ginger; here used as a counter-odour.    From Wordnik.com.  [Arabian nights. English] Reference

Alpinia will assist you in planning and realizing gardens from modern to rocky and all that is in between.    From Wordnik.com.  [MyLinkVault Newest Links] Reference

True cardamon is Elettaria cardamomum; if you want to grow it don't confuse it with the ornamental cardamon-leaf ginger, Alpinia calcarata, which is often sold as Cardamon but doesn't produce pods.    From Wordnik.com.  [Towards Sustainability] Reference

“Su’úd,” an Alpinia with pungent rhizome like ginger; here used as a counter-odour.    From Wordnik.com.  [The Book of The Thousand Nights And A Night] Reference

(Alpinia galanca) (root).    From Wordnik.com.  [Chapter 25] Reference

Alpinia occurred near Wulloboom.    From Wordnik.com.  [Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries] Reference

1, 2, 3, 5) · Grind the fresh rhizome of Alpinia galanga.    From Wordnik.com.  [Chapter 18] Reference

1, 2, 3) · Mix 10-15 g of dried Alpinia galanga rhizome powder with a little brown sugar to make a paste.    From Wordnik.com.  [Chapter 7] Reference

7) Alpinia calcicola.    From Wordnik.com.  [The News is NowPublic.com - NowPublic.com: The News is Now Public] Reference