Francisco Freire Allemão e Cysneiro

Francisco Freire Allemão e Cysneiro (24 June 1797 – 11 November 1874) was a Brazilian botanist who collected in northeast Brazil and along the Rio de Janeiro. His association with the Brazilian National Museum in Rio de Janeiro took place at a time when Brazilian botany was dominated by foreigners.

Among his many duties as physician of the Brazilian court was to fetch the Emperor's bride from Italy.

Some genera and species named by him:
 * Astronium urundeuva
 * Myracrodruon urundeuva
 * Acanthinophyllum strepitans (Moraceae)
 * Amburana cearensis (Fabaceae) (synonym: Torresea cearensis )
 * Andradea (Nyctaginaceae)
 * Andradea floribunda
 * Azeredia (Cochlospermaceae)
 * Bumella sartarum (Sapotaceae)
 * Azeredia pernambucana
 * Chrysophyllum arenarium (Sapotaceae)
 * Chrysophyllum cearaense = Chrysophyllum gonocarpum
 * Chrysophyllum cysneiri = Chrysophyllum gonocarpum
 * Chrysophyllum obtusifolium = Chrysophyllum gonocarpum
 * Chrysophyllum perfidum
 * Chrysophyllum tomentosum
 * Cordia oncocalyx (Boraginaceae)
 * Dalbergia nigra (Fabaceae)
 * Echyrospermum balthazarii (Fabaceae)
 * Hyeronima (Euphorbiaceae)
 * Hyeronima alchorneoides
 * Jussiaea fluctuans (Onagraceae)
 * Lucuma meruocana (Sapotaceae)
 * Lucuma minutiflora
 * Lucuma montana
 * Luetzelburgia auriculata (Fabaceae)
 * Manilkara elata (synonym: Mimusops elata )
 * Mezia navalium (Lauraceae) (synonyms: Mezilaurus navalium ; Silvia navalium )
 * Mimusops triflora (Sapotaceae)
 * Miscolobium nigrum (Fabaceae)
 * Moldenhawera speciosa (Fabaceae)
 * Myrocarpus
 * Ophthalmoblapton macrophyllum (Euphorbiaceae)
 * Pinckneya viridiflora (Rubiaceae) (synonym: Simira viridiflora ; Sickingia viridiflora )
 * Pterygota brasiliensis (Sterculiaceae)
 * Ribeirea (Santalaceae)
 * Ribeirea calophylla
 * Ribeirea calva
 * Ribeirea cupulata
 * Ribeirea elliptica
 * Tipuana auriculata (Fabaceae)
 * Vatairea heteroptera
 * Vazea (Olacaceae)
 * Zollernia mocitayba (Caesalpiniaceae)