132 MERRILL. 



3. Leaves 2 to 5 cm wide. 



4. Flowers, young leaves and branches densely covered with a rather pale, 



yellowish-brown tomentum - 19. L. philippensis 



4. Tomentum dark-rusty-brown ... . 20. L. ferrugineus 



2. Flowers 4- to 6-merous, usually 5-merous, each subtended by a single small 

 bract, arranged in fascicles, cymes, or racemes; corolla straight or curved, 

 glabrous or only slightly pubescent. § Dendropiithoe. 

 3. Inflorescence of axillary, solitary or fascicled, often very short, simple 

 racemes. 



4. Leaves sessile and strongly cordate at the base 21. L. hallicri 



4. Leaves distinctly petioled, acute or acuminate at the base. 

 5. Flowers more or less curved, 3 to 4 cm long. 



6. Leaves prominently 5-plinerved, obtuse; racemes very short, fas- 

 cicled 22. L. dementis 



6. Leaves not 5-plinerved; racemes solitary, in pairs, or fasciculate, 

 elongated. 

 7. Leaves lanceolate, about 15 cm long; racemes fascicled. 



23. L. copelandii 

 7. Leaves elliptic-ovate to elliptic-oblong, less than 10 cm long; 



racemes solitary or in pairs 24. L. loheri 



5. Flowers straight, about 1.5 cm long 25. L.pentandrus 



3. Inflorescence of racemosely disposed triads. 

 4. Flowers all sessile. 



5. Petioles 1 to 1.5 cm long. 



6. Corolla about 1.5 cm long, somewhat inflated.. 26. L. subalternifolius 

 6. Corolla 2 cm long, very slender, not at all inflated.. 27. L. boholensis 

 5. Petioles 3 mm long or less or the leaves sessile. 



6. Leaves lanceolate to ovate, sessile, the lateral nerves 6 to 8, obscure; 



corolla about 2 cm long 28. L. secundiflorus 



G. Leaves ovate to elliptic-ovate, short-petioled, the lateral nerves 3 

 or 4, rather distinct, the reticulations lax; corolla 1.5 cm long. 



29. L. mindanaensis 

 4. Central flower of each triad sessile, the two lateral ones short- or long- 

 pedicelled. 

 5. Leaves rounded or acute at the base, the petioles elongated. 



G. Inflorescence cauline; pedicels of the lateral flowers very short, 1 



mm long or less 30. L.revolutus 



6. Inflorescence axillary and terminal, lax; pedicels of the lateral 

 flowers elongated. 

 7. Inflorescence lepidote; leaves acute or slightly acuminate. 



31. L. ahernianus 

 7. Inflorescence glabrous; leaves strongly caudate-acuminate. 



32. L. acuminatissimus 

 5. Leaves strongly cordate at the base, short-petioled ; pedicels of the 



lateral flowers short 33. L. ovatifolius 



3. Inflorescence of umbellately disposed triads. 



4. Leaves whorled - 34. L. halconensis 



4. Leaves opposite or alternate. 



5. Flowers 5- and 6-merous in the same umbels 35. L. haenkeanus 



5. Flowers 4-merous ■—. 36. L. curranii 



3. Inflorescence of terminal and axillary cymes; flowers 6-merous. 



37. L. viridis 

 3. Inflorescence of sessile fascicled flowers, axillary or at the nodes. 



4. Leaves sessile; flowers 5-merous 16. L. cuernosensis 



