Amorphophallus, (EXCL. A. LONGISPATHACEUS, A. LUZONIENSIS AND A. MERRILLII, SEE ABOVE)

KEY TO THE PHILIPPINE SPECIES OF AMORPHOPHALLUS (EXCL. A. LONGISPATHACEUS, A. LUZONIENSIS AND A. MERRILLII, SEE ABOVE) View in CoL

1. Inflorescence short pedunculate, spathe sessile on the soil or almost so................................... 2

1. Inflorescence long pedunculate; peduncle longer than spathe ............................................. 5

2. Spathe hooded (fornicate), hiding the spadix........................................... 1. A. fornicatus View in CoL

2. Spathe campanulate, opening widely exposing the spadix ............................................ 3

3. Spadix far exceeding the spathe, appendix narrowly elongate, smooth, style slender, stigma entire..... 5. A. yaoi View in CoL

3. Spadix as long as or at most 10 cm longer than spathe, appendix (broadly) conical or fusiform-conical, smooth or irregularly wrinkled/folded, style sturdy or slender, stigma shallowly or strongly lobed....................... 4

4. Spadix shorter than or slightly longer than spathe, appendix broadly conical-triangular, base cuneate or overarching, surface usually wrinkled/folded, spathe margin not rolled inwards, style slender, at least twice as long as ovary..................................... A. paeoniifolius View in CoL

4. Spadix as long as or at most 10 cm longer than spathe, more or less distinctly appendix fusiform-conical, base more or less constricted, surface inside smooth or very shallowly rugulose, spathe margin narrowly rolled inwards, style sturdy, almost as long as ovary or slightly longer. 4. A. urceolatus View in CoL

5. Spathe small, not longer than 10 cm, purple on both sides................................. A. palawanensis View in CoL

7. Sterile zone between female and male zone present, covered with broadly flattened, shield-like staminodes..... 8

7 Sterile zone between female and male zones absent. 9

8. Spadix shorter or only slightly longer than spathe; appendix surface heavily verrucose............. A. salmoneus View in CoL

8. Spadix far outreaching the spathe; appendix smooth or shallowly rugulose...................... 3. A. rayongii View in CoL

9. Spadix shorter than spathe; appendix fusiform; stigmas with 4–5 prominent, rod-like extensions... 2. A. cidarioides View in CoL

9. Spadix distinctly longer than spathe;appendix narrowly elongate conical, stigmas without extensions.......... 10

10. Style 1 mm or shorter......................... 11

10. Style 2 mm or longer.......................... 12

11. Stigma trilobed, lobes equal, tuber developing numerous small globose offsets each year, leaf blade without intercalary bulbils; spathe base inside heavily verrucate, sometimes slightly confluent forming shallow ridges.......................................... A. declinatus View in CoL

11. Stigma one- or trilobed and then one lobe much larger than the other two; tuber not developing offsets; mature leaf blade with a central half-intercalary bulbil at the junction of the petiole and the lamina and sometimes at the first major branching points of the main segments; spathe base inside heavily verrucate, verrucae often confluent forming very prominent ridges.................. A. rostratus View in CoL

12. Spathe broadly triangular, almost as broad as long; spadix at most twice as long as the spathe; leaflets more or less gradually narrowing to a short, acuminate tip............................................ A. dactylifer View in CoL

12. Spathe elongate triangular, twice longer than broad; spadix at least 2.5 times longer than spathe; leaflets abruptly narrowed into a long, narrow acuminate tip. A. adamsensis View in CoL