40 



from the Philippines, of which four are proposed as new. Of these 

 fourteen species, so far as is known to-day, thirteen are endemic to the 

 Philippines, a single species, Rhododendron cuneifolium, being known from 

 outside the Archipelago, this species having originally been described 

 from specimens collected on Mount Kinabalu, British North Borneo. 



Artificial key to the Philippine species of Rhododendron. 



1. Leaves acute or acuminate. 



2. Leaves and branches setose (1) R. subsessile 



2. Leaves and branches glabrous, or at least only 

 lepidote. 

 3. Flowers 3 cm. long or less. 



4. Flowers 1.5 to 2 cm. long, red ; leaves 



6 cm. long. An erect shrub (10) R. apoanum 



4. Flowers 3 cm. long, white or pink ; 

 leaves 4.5 to 5.5 cm. long. An erect 



shrub (8) R. lussoniense 



4. Flowers 3 cm. long, yellow ; leaves 8 



to 10 cm. long. An epiphytic shrub.. (4) R. xantlio'petalum 

 3. Flowers 4 to 6 cm. long. 



4. Flowers 5 to 6 cm. long, red (6) R. spectabile 



4. Flowers 4 to 4.5 cm. long, white. 



5. Leaves acute or only slightly acu- 

 minate, 8 to 11 cm. long (2) R. schadenbergii 



5. Leaves slender acuminate, 12 to 



18 cm. long (3) R. Jcochii 



1. Leaves obtuse, rounded or emarginate. 

 2. Flowers 3 to 4.5 cm. long, white. 



3. Flowers 3 cm. long ; leaves 2.5 to 4.5 cm. 



long (9) R. vidalii 



3. Flowers 4 cm. long, campanulate ; leaves 



6 to 8 cm. long (5) R. mindanaense 



3. Flowers 4.5 cm. long, tubular ; leaves 4 



to 6 cm. long (7) R. copelandi 



2. Flowers 1 to 2.5 cm. long, red. 



3. Flowers 2.5 cm. long ; leaves 2.5 to 4.5 cm. 



long ... 



3. Flowers 1.5 cm. long or less. 



4. Leaves mostly 5 to 9 mm. wide ; 



flowers 1.5 cm. long 



4. Leaves mostly 2 to 4 mm. wide ; 

 flowers 1 cm. long. 



5. Pedicels densely lepidote (14) R. cuneifolium 



5. Pedicels pubescent (13) R. rosmarinifolium 



(1) Rhododendron subsessile Rendle, Journ. Bot. 34:357. 1896. 



A species related to Rhododendron ledifolium G. Don., represented by No. 

 5799 (Elmer), and No. 922 (Forestry Bureau) collected by Barnes, both 

 numbers from Mount Santo Tomas, Province of Benguet, Luzon, March 

 and May, 1904 (flower). A shrub reaching a height of 3 m., previously 

 known only from the District of Lepanto, Luzon. 



(2) Rhododendron schadenbergii Warb. in Perk. Frag. Fl. Philip. 172. 



1905; R. javanicum Vidal, Sinopsis, Atlas, t. 60, f. F. 1883; Rev. 

 PI. Vase. Filip. 170. 1886; F.-Vill. Nov. App. 353. 1883, non Blume. 



(11) R. wliiteheadii 



(12) R. quadrasianum 



