PHILIPPINE ERICACE^. 379 



4. RHODODENDRON Linn. 



Leaves acuminate or acute. 



Leaves and branches densely appressed-hirsute-setose 1. /^. subsessile 



Leaves and branches glabrous, or at most only lepidote. 

 Flowers 3 cm long or less. 



Flowers 1.5 to 2 cm long, red; leaves 6 cm long 2. R. apoanum 



Flowers 3 cm long, yellow; leaves 8 to 10 cm long 3. R. xanthopetalum 



Flowers 3.5 to 6 cm long. 



Leaves very densely brown-lepidote beneath; flowers tubular, crimson, 



about 5 cm long 4. r_ nortonae 



Leaves glabrous beneath or with scattered lepidote scales only. 



Ovary rather densely hirsute 5. r^ kochii 



Ovary glabrous. 



Corolla white, 3.5 to 4 cm long; leaves sharply acuminate. 



6. R. schadenbergii 

 Corolla red, 5 to 6 cm long; leaves acute or slightly acuminate, dull. 



7. R. spectabile 

 Corolla yellow, 4.5 to 5 cm long; leaves acute or slightly acuminate, 



rarely obtuse, shining 8. R. dementis 



Leaves obtuse, rounded, or emarginate. 

 Flowers 3 to 4.5 cm long, white. 



Flowers 3 cm long, subcampanulate; leaves usually 2.5 to 4.5 cm long, rarely 



5.5 cm in length ;... 9. j^. ^i^i^^i 



Flowers 4 to 4.5 cm long, infundibuliform; leaves 6 to 8 cm long. 



10. R. mindanaense 

 Flowers 4 cm long, the corolla tubular, slender; leaves 4 to 6 cm long. 



11. -B. copelandi 

 Flowers 2 to 2.5 cm long, red. 



Flowers 2.5 cm long, campanulate. 



Leaves oblong-obovate or oblong-oblanceolate, 2.5 to 5.5 cm long. 



12. R. ciirranii 

 Leaves obovate or orbicular-obovate, rarely oval, 2.5 to 5.5 cm long. 



13. R. whiteheadii 

 Flowers 2 cm long, tubular ; leaves narrowly oblong-obovate. 



14. R. malindangense 

 Flowers 1.5 cm long or less. 



Flowers mostly 1.5 cm long; leaves 5 to 9 mm wide, sometimes narrower, 

 narrowly obovate-oblong I5. /,». quadrasianum 



Flowers mostly about 1 cm long; leaves linear-oblong, mostly 2 to 4 mm 

 ^^ 16. R. rosmarinifolitim 



1. R. subsessile Rendle in Journ. Bot. 34 (1896) 357; Merr. in Govt. Lab 

 Publ. (Philip.) 29 (1905) 40. 



Luzon, District of Lepanto, Mount Data, Whitehead, in Herb. Mus. Brit. 

 (type) ; Merrill 4606: Province of Benguet, Suyoc to Pauai, Merrill 4690; Pauai, 

 Bur. Sci. Jf275 M earns; Mount Tonglon (Santo Tomas), For. Bur. 5032 Curran; 

 M earns s. n.; Merrill 4815; Williams 1223, 2001; Elmer 5799; For. Bur. 11090 

 Whitford; For. Bur. 922 Barnes. 



Widely distributed and very common in the highlands of northern Luzon, from 

 1,800 to 2.250 m altitude: apparently very closely allied to the Formosan R 

 oldhami Maxim. 



