Bonjour,
Il s'agit bien d'une célosie, en particulier celosia cristata. Du moins cela ressemble étrangement à la photo du lien ci-dessous (hormis peut être la partie apicale plus colorée chez vous).
http://wzeu.ask.com/r?t=p&d=eu&s=fr&c=p&l=dis&o=1180&sv=0a652829&ip=52eb8bf2&id=18C67ED6356A5A46F874F356533BF638&q=celosia+cristata&p=1&qs=1&ac=24&g=2961ILb3W2F58s&en=js&io=3&ep=&eo=&b=img&bc=&br=&tp=d&ec=5&pt=Source&ex=&url=http%253A%252F%252Fwww.intranet.csupomona.edu%252F%257Etbhfujimoto%252FHOR233%252FList6%252FCelosia_crista.html&u=http%3A%2F%2Fimages.fr.ask.com%2Ffr%3Fq%3Dcelosia%2Bcristata%26desturi%3Dhttp%253A%252F%252Fwww.intranet.csupomona.edu%252F%257Etbhfujimoto%252FHOR233%252FList6%252FCelosia_crista.html%26fm%3Di%26ac%3D24%26ftURI%3Dhttp%253A%252F%252Fimages.fr.ask.com%252Ffr%253Fq%253Dcelosia%252Bcristata%2526desturi%253Dhttp%25253A%25252F%25252Fwww.intranet.csupomona.edu%25252F%25257Etbhfujimoto%25252FHOR233%25252FList6%25252FCelosia_crista.html%2526imagesrc%253Dhttp%25253A%25252F%25252Fwww.intranet.csupomona.edu%25252F%25257Etbhfujimoto%25252FHOR233%25252FList6%25252FCelosia_cristata.jpg%2526thumbsrc%253Dhttp%25253A%25252F%25252F65.214.37.88%25252Fts%25253Ft%25253D14485269252140185985%2526thumbuselocalisedstatic%253Dfalse%2526fn%253DCelosia_cristata.jpg%2526imagewidth%253D640%2526imageheight%253D480%2526fs%253D41%2526f%253D2%2526fm%253Di%2526ftbURI%253Dhttp%25253A%25252F%25252Fimages.fr.ask.com%25252Fpictures%25253Fq%25253Dcelosia%25252Bcristata%252526page%25253D1%26qt%3D0
http://www.intranet.csupomona.edu/~tbhfujimoto/HOR233/List6/Celosia_cristata.jpg

ça aide !