PHILIPPINE LORANTHACEiE. 
131 
1. LORANTHUS L inn. 
1. Petals entirely free; flowers subtended by a single bract. 
2. Flowers small, less than 1 cm long, 5-merous, arranged in axillary spikes or 
racemes; buds strongly constricted in the median portion, base and apex 
inflated. § Piioenicanthemum. 
3. Flowers racemose 1. L. pentapetalus 
3. Flowers spicate 2. L. sessiliflorus 
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. benguetensis 
4. Flowers 4-merous. 
5. Leaves sessile 6. L. luzonensis 
5. Leaves petioled. 
6. Inflorescences scattered along the branches 7. L. mirabilis 
6. 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. mearnsii 
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. cauliflorus 
7. Flowers all pedieelled, arranged in slender, few-flowered cymes. 
8. Leaves about 20 cm long, prominently acuminate; flowers 3.5 
cm long 12. L. lanaensis 
8. Leaves 14 cm long or less, blunt, acute, or only slightly acumi- 
nate; flowers 3 cm long 13. L. bicolorutus 
7. Flowers in triads, all sessile, two triads on a short common 
peduncle - 14. L. hexanthus 
6. Leaves broad and rounded at their apices; flowers in pairs, which 
are fasciculate at the nodes 15. L. hutchinsonii 
5. Leaves sessile - - - 16. L. cuernosensis 
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. 
§ ClCHLANTHUS. 
3. Leaves usually less than 2 cm in width. 
4. Fruit ellipsoid, not at all narrowed _ at the base 17. L. estipitatus 
4. Fruit narrowly obovoid, gradually narrowed to the base. 
18. L. sphenoideus 
