Rafflesia lobata Galang and Madulid

The specific epithet derives from the morphology of the lobed diaphragm.   

This species was described and named in the following:

Galang, R. and D. A. Madulid. 2006.  A second new species of Rafflesia (Rafflesiaceae) from Panay Island, Philippines.  Folia Malaysiana 7: 1-8.

This species was discovered by Renee Galang during his expedition to Mt. Igtuog and Mt. Sakpaw in the Central Panay mountain range during the course of his study of the Philippine Spotted Deer (Cervus alfredi).   An Australian ecotourist group (PSDCF = Philippine Spotted Deer Conservation Foundation) has a web page with numerous photographs and videos of this species that can be seen HERE.

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. That said, it is interesting to note that 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. It should also be noted that some populations of R. manillana, such as one at Bolos Point, Cagayan Valley, Luzon, also have flowers with lobed, outwardly curving diaphragms.  See photo HERE.

For more information about this species, see:

Galang, R. 2007. Population study of Rafflesia lobata in the northern section of the central Panay Island mountain ranges, Philippines. Folia Malaysiana Vol 8(2) 87-98.
 
Galang, R. 2009. The distribution of Rafflesia lobata in the northern section of the central Panay mountain ranges, Panay Island Philippines. Folia Malaysiana Vol 10 (2) 99-108.




A five-lobed flower. Mt. Igtuog, Antique Province, Panay Island, Philippines. Photo by Renee Galang.



A three-lobed flower. Mt. Igtuog, Antique Province, Panay Island, Philippines. Photo by Renee Galang.

Rafflesia lobata 6-merous flower
Rafflesia lobata 6-merous diaphragm

Above two photos: a 6-merous flower and close-up of the disk and diaphragm. Two hour hike north of Camandag on Mt. Agua Colonia, Mnp. Leon, Iloilo Prov., Panay Island, Philippines.  Photos by Ricky Brandie Martin.



A pair of slightly senescent flowers. Pandan, Antique Province, Panay Island, Philippines. Photo by Renee Galang.



Aerial buds on Tetrastigma host vine.  Sebaste, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



A heavily infected Tetrastigma host vine with lots of aerial buds and flowers. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Aerial bud and flower. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Aerial bud and flowers. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



A pair of simultaneously open flowers. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Open flower showing distinct lobing on diaphragm. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Close-up of top of disk. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Female flower, longitudinal section. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Male flower, longitudinal section. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.



Underside of disk (column removed) showing anthers with liquid pollen being released. Mt. Igtuog, Antique Province, Panay Island, Philippines.  Photo by Renee Galang.
SIUC / College of Science / Parasitic Plant Connection / Rafflesiaceae
URL: http://www.parasiticplants.siu.edu/Rafflesiaceae/Raff.lobata.page.html
Last updated: 30-Jul-10 / dln