''Rafflesia lobata'' is a parasitic plant species of the genus '' Rafflesia''. It is endemic to the Philippine island of

Panay Panay is the sixth-largest and fourth-most populous island in the Philippines, with a total land area of and has a total population of 4,542,926 as of 2020 census. Panay comprises 4.4 percent of the entire population of the country. The City o ...

, particularly the mountains of

Antique An antique ( la, antiquus; 'old', 'ancient') is an item perceived as having value because of its aesthetic or historical significance, and often defined as at least 100 years old (or some other limit), although the term is often used loosely ...

and Iloilo provinces. This is the second species recorded from the island of Panay. One of the most distinctive features of Rafflesia lobata is that some populations have flowers with a lobed diaphragm that opens outward. Nearly all other Rafflesia (and Sapria) species have diaphragms that curve inward. This feature is polymorphic in R. lobata (at least as the species is currently defined). As shown in the photos below, in some populations the diaphragm curves inward and may be 3- or 6-lobed. Note the 6-lobed flower also has 6 perigone lobes. It remains to be seen whether flower merousity has phylogenetic significance that should be taxonomically recognized. Some populations of R. manillana, such as one at Bolos Point, Cagayan Valley, Luzon, also have flowers with lobed, outwardly curving diaphragms. The name of the species was derived from its distinctive lobed diaphragm. The first population of ''R. lobata'' was discovered by the local conservation group studying

Philippine Spotted Deer The Visayan spotted deer (''Rusa alfredi''), also known as the Visayan deer, the Philippine spotted deer or Prince Alfred's deer, is a nocturnal and endangered species of deer located primarily in the rainforests of the Visayan islands of P ...

(''Cervus alfredi'').

References

lobata Lobata is an order of Ctenophora in the class Tentaculata with smaller tentacles than other ctenophores, and distinctive flattened lobes extending outwards from their bodies. They grow up to about long. Anatomy The lobates have a pair of lo ...

Endemic flora of the Philippines Flora of the Visayas {{Malpighiales-stub