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Madvigia is a synonym of:

genus Cryptanthus Otto & A.Dietr.  (non Osbeck, 1757)

(subfam. Bromelioideae)

Publ: Allg. Gartenz. 4: 298 (1836)

Status: nom.cons.

Type: Cryptanthus bromelioides Otto & Dietrich

Number of species: 67
   and 5 infraspecific taxa
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Genus Notes:

Allg. Gartenzeitung 4: 298. 17 Sep 1836, nom. cons., non Cryptanthus Osbeck, Dagb. Ostind. Resa: 215. 1757 (phan.-incertae sedis).
Type Cryptanthus bromelioides Otto & A. Dietr., Allg. Gartenzeitung 4: 298. 17 Sep 1836. Currently recognized in the subfam. Bromelioideae. From the Greek krypto, hide, and anthos, flower, as to the sometimes inconspicuous inflorescence.
(from Grant & Zijlstra 1998)