540 Philippine Journal of Science i9i» 



CYATHEACEAE 

 CYATHEA Smith 

 CYATHEA HAENKEI (Presl) comb. nov. 



Alsophila haenkei Presl Rel. Haenk. 1 (1825) 68. 

 Cyathea marianna Gaudich. Bot, Freyc. Voy. (1826) 265. 

 Guam, Nelson 538, May, 1919, in ravines near the headwaters of a 

 tributary to the Pago River. 



The type of Presl's species was from the Marianne Islands, 

 in all probability from Guam, while that of Gaudichaud was 

 from Guam. Both have been reduced as synonyms of Alsophila 

 extensa (Forst.) R. Br., which does not appear to me to be 

 correct. Regarding the occurrence of this species in Guam I 

 wrote to Mr. Nelson in September, 1914, supplying him with 

 photographs of Philippine tree ferns, and suggested that he 

 search for the Guam species, to which he replied that in his 

 fourteen years residence in Guam, in which time he had visited 

 most parts of the Island, he had never seen any tree ferns. A 

 few specimens were located by him in May, 1919, apparently 

 very old plants. The larger plants were about 3 m high, the 

 trunk 15 to 20 cm in diameter below, tapering to 10 cm near 

 the top. The species is apparently very rare and local in Guam 

 and is probably approaching extinction. 



GRAMINEAE 



THUAREA Persoon 

 THUAREA INVOLUTA (Forst. f.) R. & S. Syst. 2 (1817) 782. 

 Ischaemum involutum Forst. f. Prodr, (1786) 73. 

 Thuarea sarmentosa Pers. Syn. 1 (1805) 110. 



Guam, Anigua, Nelson 342, December, 1919, along the sea- 

 shore, local name las-aga. A common Malayan-Polynesian 

 strand plant, but not previously recorded from Guam. 



GARNOTIA Brongniart 

 GARNOTIA STRICTA Brongn. in Bot. Duperry's Voy. (1829) 132, t. 21. 



Guam, hills back of Piti, Nelson 359, 403, December, 1918, 

 and February, 1919. The genus is new to Guam, the species 

 having been originally described from Tahiti, but now, as a 

 somewhat variable one, known to extend from India, through 

 Malaya to Hawaii. 



DIGITARIA Heister 



DIGITARIA ROBINSONII sp. nov. 



Species D. pacificae Stapf et D. stenotaphrodi Stapf affinis 

 differt racemis numerosis, plerumque circiter 15, confertis, ra- 

 cemose dispositis. 



