May 31, 1919] 



ZlNGIBERACEAE OF THE SOBSOGON PENINSULA 



2989 



PLAGIOSTACHYS Ridl. 



Piagiostachys philippinensis Ridl. 



Field-note: — Small clusters in fertile moist humus 

 covered ground of dense woods at 1000 feet altitude. 

 Stems 3 to 5 feet long, deep green, terete, .5 inch thick, 

 enlarged at the base, 3 to 5 in a cluster; leaves ascending, 

 submembranous, the basal ones much reduced and scat- 

 tering, the largest ones terminal, margins straight, paler 

 beneath, with reddish ligules and sheath margins; in- 

 florescence arising on the stem one foot above ground 

 or below the lowermost leaflet, ascending, 3 to 5 inches 

 long, few short branched from the base, rigid, covered 

 with dirty rotten bracts; buds whitish, flower pink; the 

 short ovoid fruits green. 



Represented by number 16215, Elmer, Irosin (Mt. 

 Bulusan), Province of Sorsogon, Luzon, May, 1916. 



Piagiostachys ridleyi Elm. 



Field note for 16607: — Rather large clumps in wet 

 black ground among secondary forests at 1000 feet al- 

 titude and facing the Pacific ocean. Rhizome short, re- 

 branched, hard and tough, .5 inch thick, yellowish; 

 stems several, ascending, enlarged at the base, .75 inch 

 thick, terete, green, 6 to 10 feet high, the basal one yard 

 leafless; blades ascending, tips abruptly recurved, coria- 

 ceous, lighter green beneath, midrib yellowish beneath, 

 3 to 7 inches apart, the uppermost closer set and much 

 narrower; inflorescence lateral, 6 inches long, about a 

 yard above ground and beneath the foliage, usually 3 

 branched from near the base, erect, the thick terete 

 rachis greenish; flowers whitish yet tinged with red, 

 succulent, the old ones forming wet rotten masses; fruits 

 dark green, ellipsoidly globose, about .5 inch thick. 



Represented by numbers 15279 and 16607, Elmer, Irosin 

 (Mt. Bulusan), Province of Sorsogon, Luzon, December 

 1915 and July 1916 respectively. 



Piagiostachys escritorii Elm. 



Field-note for 16216: — Dense tussocks in wet humus 

 covered fertile soil or in densely wooded or forested flats 

 at 1000 feet altitude. Stems several to numerous, as- 

 cending, 5 feet long, 1 inch thick at the base, terete, 

 green; leaves ascending or horizontal, the much reduced 

 blades one third above the ground and much scattering, 

 the terminal ones narrower, thinly coriaceous, much darker 



