PHILIPPINE LORANTHACE^E. 131 



1. LORANTHUS Linn. 



1. Petals entirely free; flowers subtended by a single bract. 



2. Flowers small, less tban 1 cm long, 5-merous, arranged in axillary spikes or 

 racemes ; buds strongly constricted in the median portion, base and apex 

 inflated. § Phoenicanthemum. 



3. Flowers racemose 1. L. pentapetalus 



3. Flowers spicate 2. L. sessilifluriix 



2. Flowers medium, 1 to 4 cm long, rarely smaller, 4- to 6-merous, arranged in 

 axillary fascicles, cymes or racemes; buds not constricted in the median 

 portion. § Heteranthus. 

 3. Leaves whorled. 

 4. Flowers 5-merous. 

 5. Leaves petioled. 



6. Leaves oblong-ovate to elliptic-ovate, apex blunt-acuminate or acute, 



8 cm long or more 3. L. basilanensis 



6. Leaves narrowly obovate-elliptic, rounded at the apex, 7 cm long or 



less 4. L. merrittii 



5. Leaves sessile 5. L. bcnguctensis 



4. Flowers 4-merous. 



5. Leaves sessile 6. L. luzoncnsis 



5. Leaves petioled. 



G. Inflorescences scattered along the branches 7. L. mirabilis 



G. Inflorescences at the nodes only 8. L. acutus 



3. Leaves opposite, subopposite or alternate. 

 4. Flowers 4-merous. 



5. Flowers less than 1 cm long; leaves lanceolate 9. L. tenuis 



5. Flowers nearly 2.5 cm long; leaves elliptic-ovate to elliptic-obovate. 



10. L. mcarnsii 

 4. Flowers 5-merous. 

 5. Leaves all petioled. 



6. Leaves acute or acuminate at the apex. 



7. Flowers all sessile, arranged in groups of threes along one side of 



the branches 11. L. cauliftorus 



7. Flowers all pedicelled, arranged in slender, few-flowered cymes. 

 8. Leaves about 20 cm long, prominently acuminate; flowers 3.5 



cm long 12. L. lanaensis 



S. Leaves 14 cm long or less, blunt, acute, or only slightly acumi- 

 nate; flowers 3 cm long 13. 1j. bicoloratus 



7. Flowers in triads, all sessile, two triads on a short common 



peduncle 14. L. hcxanthus 



0. Leaves broad and rounded at their apices; flowers in pairs, which 



are fasciculate at the nodes 15. L. hutchinsoni'i 



5. Leaves sessile 16. L. cuerno»en»it 



1. Corolla-lobes more or less united, forming a short or long tube. 



2. Flowers 4-merous, small or medium, each subtended by a single small bract; 

 corolla straight or curved, outside very densely tomentose or farinose. 



§ ClCIILANTHUS. 



3. Leaves usually less than 2 cm in width. 



4. Fruit ellipsoid, not at all narrowed at the base 17. L. cstipitatus 



4. Fruit narrowly obovoid, gradually narrowed to the base. 



18. L. sphenoideus 



