Amorphophallus

Naive, M. A. K., Hein, K. Z. & Hetterscheid, W., 2022, Taxonomic studies of Araceae in Myanmar IV: A new species, a new record and a new synonym for the genus Amorphophallus, Blumea 67 (2), pp. 123-128 : 128

KEY TO THE GENUS AMORPHOPHALLUS OF MYANMAR (EXCLUDING A. CHLOROSPATHUS, A. GLIRUROIDES AND A. PURPURASCENS )

Due to the lack of enough detail mainly because of their incomplete and brief description in the protologues, we excluded three species in the key which are A. chlorospathus, A. gliruroides and A. purpurascens .

1. Spadix without appendix,sterile zone between staminate and pistillate zones present and set with large, globose or elongate obovoid staminodes.......... A. margaritifer

1. Spadix with appendix.......................... 2

2. Sterile zone between staminate and pistillate zones present, set with flattened, gibbous staminodes.. A. krausei

2. Staminate and pistillate zones contiguous, sterile zone absent...................................... 3

3. Peduncle much shorter than spathe, inflorescence usually sessile on the ground.......................... 4

3. Peduncle distinctly longer than spathe............. 6

4. Spathe campanulate, appendix very broadly conical, usually strongly wrinkled/folded, style long, narrow, to 4 mm long................................. A. paeoniifolius

4. Spathe oval, erect, appendix narrowly conical or narrowly fusiform, style c. 1 mm long...................... 5

5. Peduncle dark green with white spots or lines, stigma large, to 4 mm diam.......................... A. bulbifer

5. Peduncle uniformly dark or pale green, stigma to 2.5 mm diam............................... A. yuloensis

6. Spathe with a distinct base and limb, separated by a shallow or more distinct constriction, limb oblique or horizontal....................................... A. muelleri

6. Spathe without constriction, limb erect............. 7

7. Spathe strongly concave........................ 8

7. Spathe not concave............................ 9

8. Appendix with a strongly convoluted surface (brain-like) or with two or more deep vertical furrow... A. kachinensis

8. Appendix not convoluted or furrowed, with shallow depres- sions.................................. A. putii

9. Appendix diameter distinctly less than staminate zone diameter................................. A. wasa

9. Appendix diameter as staminate zone or broader.... 10

10. Stigma large, to 4 mm diam, spathe inside usually uniformly pale to deep pink....................... A. bulbifer

10. Stigma 1–2 mm diam, spathe inside never uniformly pale or deep pink................................ 11

11. Staminate flowers not congested, slightly distant, appendix smooth........................ A. angustipathus

11. Staminate flowers strongly congested, appendix smooth or with several, scattered short hairs............. 12

12. Spathe base inside with several scattered, small verru- cae................................... A. elatus

12. Spathe base within smooth or only very few minute ver- rucae........................... A. cruddasianus