Lutea

Flowgrow has no page for Cryptocoryne lutea. Look the name up in its database and you land on a stub whose entire content reads: synonym of Cryptocoryne walkeri lutea. Follow that link and the target page lists Cryptocoryne lutea Alston in its own synonyms row, so the identification is confirmed from both directions. The plant traded as C. lutea is a form of Cryptocoryne walkeri, and this entry now carries that name. The trade name stays in the synonyms and the address of this page has not changed.

That target page is a data sheet with no description at all, just its numbers and two book citations, so what follows is what it publishes and nothing more. The plant is from Sri Lanka. The optimum is 22 to 26 °C at pH 5 to 8, and carbonate hardness runs from 1 all the way to 18 dKH, which is a wide window even by the standards of a genus known for tolerating hard water. Light is rated low to high, difficulty easy, growth slow, and the listed uses are the midground or a foreground group. It spreads by runners, and can also be divided at the rhizome or separated from its daughter plants.

The published CO2 range starts at 5 mg/l, which is roughly where an uninjected tank already sits, so this entry keeps its no-injection label. There is no height row, so the 15 cm is editorial. Anything about melt behaviour or leaf colour under strong light would be invention, because the source does not discuss this plant in prose at all.