382 MERKILL. 



15. R. quadrasianum Vidal Eev. PI. Vase. Filip. (1886) 170; Merr. Govt. 

 Lab. Publ, (Tliilip.) 29 (1905) 43; Philip. Joiirn. Sci. 1 (1606) Suppl. Ill; 1. c. 

 2 (1907) Bot. 292. 



R. retiisum F.-Vill. Nov. App. (1883) 353, non R. Br. 



Luzon, Province of Zambales, Mount Pinatubo, Bur. 8cl. 2531 Foxworthy, alt. 

 1,600 to 1,800 m: Province of Bataan, Mount Mariveles, Leiberg 6032; Elmer 

 6765; For. Bur. 2090 Borden; Mliitford 218, llOJt; Merrill 3215, altitude 1,200 

 to 1,400 m: Province of Batangas, Mount Agas, For. Bur. 1116 Curran (6 Merrit, 

 November, 1907, altitude 1,050 m: Province of Tayabas, Mount Banajao, Cuming 

 SO-'i; For. Bur. 812 Klemme; For. Bur. 1888 Curran & Merritt, altitude about 

 2,200 m: Province of Laguna, Mount Maquiling, For. Bur. 1103 Curran d Merritt, 

 altitude 1,100 m: Province of Albay, Mount Mayon, Bur. Sci. 6502 Robinson, 

 altitude 1,300 m. Mindoro, Mount Halcon, Merrill 6158; For. Bur. Ji//08 Mer- 

 ritt, latitude 1,350 to 1,600 m. Negrcs, Canlaon Volcano, Banks. Mindanao, 

 District of Davao, Mount Apo, WiUia)ns 25Ji3; Copeland 1036; DeVore <& Hoover 

 281, altitude 2,600 to 3,000 m. 



Apparently the most common and widely distributed Philippine Rhododendron, 

 found on most or all high mountains from north-central Luzon to south-eastern 

 Mindanao. 



Var. intermedium var. nov. 



R. cuneifolium Rendle in Journ. Bot. 34 (1906) 355; Merr. in Govt. Lab. Publ. 

 (Philip.) 29 (1905) 43, non Stapf. 



A form intermediate between R. quadrasianum Vid., and R. rosmarinifolium, 

 Vid., with tlie leaf-form of the former, but with leaves almost as narrow as the 

 latter, and might with almost equal propriety be considered a veriety of R. 

 ros7narinifolium. From the leaf-form it appears to be dwarfed R. quadrasianum, 

 and is accordingly considered under that species. It is the form credited to the 

 Philippines by Rendle as R. cuneifolium Stapf, a Bornean species, and can be 

 readily distinguished from Stapf's species by its pubescent pedicels. 



Luzon, Province of Zambales, Mount Tapulao, For. Bur. 8063, 80S(> Cumni iC- 

 Merritt; Bur. Sci. 5082a Ramos, December, 1907, altitude about 2,100 m. 

 Mindoro, Mount Halcon, Merrill 5136 ; Whitehead in Herb. ]\Ius. Brit. 



I have examined Whitehead's specimen, cited above, and consider it to be 

 referable here, rather tlian to R. cuneifolium Stapf, although it is closely related 

 to the Bornean species. 



16. R. rosmarinifolium Vidal Rev. PI. Vase. Filip. (1886) 172; Merr. 1. c. 43. 

 Luzon, Province of Benguet, Baguio, Elmer 6311; Mount Tonglon (Santo 



Tomas), Elmer 5198; Williams 1335; For. Bur. 5035 Curran; Suyoc to Pauai, 

 Merrill Jfl52, altitude 1,800 to 2,200 m. 



The typical form of this species seems to be con lined to the tableland of 

 north-central Luzon and is very distinct, although manifestly allied to R. quad- 

 rasianum Vidal. On mountains farther south intermediate forms occur, as noted 

 above. 



