1. Ramenta short, more or less pustulate, only a few mm long, sometimes clavate...................... 2
1. Ramenta slender, more than 5 mm long..................................................................... 5
2. Flowers at least 25 cm in diameter; anthers 20-40......................................................... 4
2. Flowers less than 25 cm in diameter; anthers 15-20....................................................... 3
3. Flower 15-20 cm in diameter; perigone warts of different color than than perigone; diaphragm relatively narrow, leaving most of the central disk of the flower exposed to view from above; ramenta 2-4 mm long, clavate; anthers ca. 15. Luzon (Philippines) ................................................................................................. 9. R. manillana
3. Flower ca. 20-23 cm in diameter, perigone warts same color (orange-red) as lobes; diaphragm aperture small; ramenta 3-5 mm long, simple, furcate and clavate as they progress up to the inner edge of the aperture; anthers 20. Trus Madi range and Gunong Lotung, Borneo..................................................................... 15. R. tengku-adlinii.
4. Flowers up to 30 cm in diameter; anthers ca. 20. NE Kalimantan (Indonesia)..... 2. R. borneensis
4. Flowers (15-) 30-60 cm in diameter; anthers (25-) 32-40. Java, S. Sumatra........... 11. R. patma
5. Diaphragm aperture relatively large compared to the size of the flower; all processes visible from the outside ...................................................................................... 6
5. Diaphram aperture angular, relatively very small compared to the size of the flower, 3-9 cm in diameter, too small to be able to count the ca. 15 processes. Ramenta often branched and apices of branches globular, swollen. Sumatra (Aceh)............ 10. R. micropylora
6. Apices of ramenta either more or less distinctly swollen or crateriform................................. 7
6. Apices of ramenta not distinctly swollen .................................................................. 11
7. Disk with 10 or more processes and with a raised rim; anthers 20-40................................... 8
7. Disk with 0 (-8) processes and with a flat rim; anthers 15-20. W. Java........... 13. R. rochussenii
8. Flowers 40-52 cm in diameter; white warts on the perigone lobes covering more space than the red colored part...................................................................................... 9
8. Flowers ca. 70 cm in diameter; white warts on the perigone lobes covering less space than the red colored part; anthers (20?-) 24-30. Peninsular Thailand...................... 8. R. kerrii
9. White warts across the base of the perigone lobes 7-12................................................. 10
9. White warts across the base of the perigone lobes very large, 4 or 5 only; ramenta slender, apices swollen; anthers ca. 20. Sumatra (W. coast)............................ 6. R. hasseltii
10. White warts across the base of the perigone lobes 10-12; some ramenta with swollen, others with crateriform apices; anthers ca. 30. Sumatra (W. coast).................. 5. R. gadutensis
10. White warts across the base of the perigone lobes 7-9; ramenta slender, all with swollen apices; anthers ca. 20-25. Malaya................................................. 3. R. cantleyi
11. White warts arranged tangentially across the middle of the perigone lobes and numbering more than 10.................................................................................... 12
11. White warts arranged tangentially across the middle of the perigone lobes and numbering 5 or 6 (to 10).................................................................................... 13
12. Larger white blots on perigone lobes not or very sparsely interspaced with numerous smaller ones. Sumatra (Benkulu to N. Sumatra), W. Kalimantan, Sarawak........... 1. R. arnoldii
12. Larger white blots on perigone lobes interspaced with numerous smaller ones. Sabah............... ..................................................................................................... 7. R. keithii
13. Flowers up to ca. 80 cm in diameter; lower face of the diaphragm with ramenta; anthers 26-38. Mindanao (Philippines)......................................... 14. R. schadenbergiana
13. Flowers 25-37 cm in diameter; lower face of the diaphragm without ramenta; anthers 20. Sabah. ..................................................................................... 12. R. pricei
Additional species
4. R. ciliata (including R. witkampii). N. Borneo. Likely extinct.
Section through a male flower of Rafflesia. Modified from Meijer (1985)
Ramentae of various species of Rafflesia. From Meijer (1985)
SIUC / College of Science / Parasitic Plant Connection / Rafflesiaceae
URL: http://www.parasiticplants.siu.edu/Rafflesiaceae/RafflesiaKey.html
Last updated: 15-Mar-02 / dln
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