265 



Typical Imperata exaltata Brongn. (Cuming 1801, 2411) is a very tall grass 

 with broad, flat leaves, pyramidal, somewhat loose panicles, the flowering racemes 

 being born on branchlets of the second or third degree; the primary brandies are 

 Up to 10 or 12 cm. long dividing into secondary branchlets and the secondary into 

 tertiary which are the flowering racemes. The structure of the spikelets in both 

 typical Imperata exaltata and the subsp. Merrillii is identical and the culms 

 are hollow in both, but solid in all other species of the genus. The form here 

 described is probably one developed in the high mountains. 



POLLINIA Trill. 



Pollinia nuda Trim in Mem. Acad. Petcrsb. VI. 2 (1833) 307; Hack, in DC. 

 Monog. Phan. 6 (1889) 178; Rendle in Joum. Linn. Soc. Bot. 36 (1904) 356. 

 Luzon, Province of Benguet, Pauai (4727 Merrill) November 8, 1905; Mount 

 Tonglon (4842 Merrill) November 12, 1905. Thickets and open places 2,000 to 

 2,200 m. Not previously reported from the Philippines. Japan to the Luchu 

 Archipelago, China, northern India, and South Africa. 



Pollinia imberbis Nces, (3 Willdenowiana Hack. 1. c. 178, forma monostachya 

 ( Francli. et Sav.). Pollinia japonica var. monostachya Franch. et Sav. 

 Luzon, Province of Benguet, Pauai (4707 Merrill) November 8, 1905. In open 

 thickets at about 2,100 m. The variety from Japan to southern China, northern 

 India and Java, the form from Japan. x 



Pollinia irritans Benth. Fl. Austr. 7 (1878) 525; Hack. 1. c. 155. 



Luzon, Province of Benguet, Ambuklao to Daklan (4388 Merrill) October 25, 

 1905. In open grass lands at about 1,000 m. Previously known only from Aus- 

 tralia (Queensland). 



Pollinia argentea Trim var. lagopus Hack, in Govt. Lab. Publ. 35 (190G) 79. 

 This variety has been re-collected at the type locality, Mount Arayat (4222 

 Merrill) September, 1905, and also in Northern Luzon: Province of Benguet, 

 Baguio, to Ambuklao (4365 Merrill) October 24, 1905; District of Lepanto, 

 Mount Data (4535 Merrill) November, 1905, ascending to 2,100 m. 



ROTTBOELLIA Linn. f. 



Rottboellia ophiuroides Benth. var. intermedia Hack. var. nov. 



DifTert a typo gluma I supra medium tantum angnste alata, in typo 

 a | inferiore latins alata, ala sursum dilatata. Vergit ad R. striatam 

 Nces. 



Luzon, Province of Benguet, Bugias (4667 Merrill) October 28, 1905; Baguio 

 (6393 Elmer) May, 1904. Intermediate between It. ophiuroides and It. striata, 

 but nearer the former. 



ARTHRAXON Beauv. 



Arthraxon microphyllus Uochst. in Flora 39 (1856) 188; Hack. 1. c. 351, 

 var. genuinus Hack. 1. c. 352. 

 Luzon, Province of Benguet, Baguio to Ambuklao (4363 Merrill) October, 

 1905; Suyoc to Pauai (4719 Merrill) November 7, 1905; District of Lepanto, 

 Mount Data (4485 Merrill) November 4, 1905. On dry and damp banks, 1,800 

 to 2,100 m. British India to Burma, Tonkin, Ceylon, and Abyssinia. Not pre- 

 viously reported from the Philipppines and not known from Malaya. 



Arthraxon ciliaris Beauv., subsp. Langsdorffii Hack. 1. c. 354. 



Luzon, District of Lepanto, Mount Data (4628 Merrill) November 5, 1905. In 

 open wet lands at 1,600 m. Japan and China. 



