210 The Philippine Journal of Science wis 
6. Nerves moderately prominent, about 15 on each side of the 
midrib, mostly 1 cm or more apart; leaves blunt-acuminate. 
13. M. cumingii 
6. Nerves very distinct, about 20 on each side of the midrib, 
mostly less than 1 cm apart; leaves acute or sharply 
acuminate : 14. M. phanerophlebium 
2. Branchlets distinctly and sharply 4-angIed, narrowly 4-winged, or at 
least 2-sulcate, not strictly terete. 
3. Lateral nerves prominent, anastomosing with the arched marginal 
nerves, the latter as prominent as the lateral ones. 
4. Leaves gradually narrowed to the contracted, subcordate-rounded 
base, sessile, the stout branches and branchlets prominently 
4-winged 15. M. elongatum 
4. Leaves mostly broad and rounded or cordate, not or but little 
contracted to a narrow base. 
5. Leaves mostly 10 cm long or less. 
6. Leaves rounded at the base; peduncles very slender, 2.5 to 
4 cm long 16. M. loheri 
6. Leaves cordate; peduncles 2 cm long or less. 
7. Lateral nerves 10 or less on each side of the midrib. 
8. Peduncles 4-angled; inflorescence compound, many-flow- 
ered 17. M. venosum 
8. Peduncles sulcate; inflorescence simple, subcapitate, few- 
flowered 18. M. cordifolium 
7. Lateral nerves about 15 on each side of the midrib. 
19. iW. subcaudatum 
5. Leaves exceeding 10 cm in length, mostly 15 to 25 cm long. 
6. Leaves very thickly coriaceous, about 10 cm wide, the branch- 
lets prominently 4-angled and winged.. 20. M. sorsogonense 
6. Leaves thickly chartaceous to coriaceous, less than 10 cm 
wide. 
7. Inflorescence lateral. 
8. Ultimate branchlets -sharply 4-angled or very narrowly 
winged; nerves very prominent. 
9, Leaves olivaceous or brown, smooth when dry. 
21. M. paniculatum 
9. Leaves pale when dry, the lower surface especially so 
and minutely pustulate 22. M. pallidum 
8. Ultimate branchlets 2-grooved, not 4-angled or 4-winged, 
the nerves not especially prominent.. 23. Af. calderense 
7. Inflorescence terminal or terminal and in the uppermost 
axils, 
8. Peduncles 2 to 4 cm long, slightly grooved or sulcate. 
24. M. terminaliflorum 
8; Peduncles up to 10 cm in length, prominently 4-winged. 
25. M. pteropus 
3. Nerves obsolete, or if present not at all prominent and not or but 
obscurely anastomosing, 
4. Leaves acute at the base. 
5. Flowers fascicled or in very short, dense cymes. 
6. Leaves sessile, about 12 cm long, their margins revolute; 
nerves distinct 26. M. sessilifolium 
