Re: Cypella herbertii

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Central & South American irids are so rare in the trade that unusual ones are quite tough to identify.  I find "Brazil Plants" to be a good place to go for reference material.  Based on the species listed there, your flower looks like a yellow Trimezia rather than a yellow Neomarica.  It certainly does not match their photo for N. longifolia.   Then again, it doesn't exactly match anything on the site.

http://brazilplants.com/iridaceae/fotoiridaceae.htm.