A REVISION OF PHILIPPINE PIPERACEAE. 
439 
culi 6 mm longi. Spica masc. usque ad 5 cm longa et 4 mm crassa, fern, 
usque ad 4 cm longa et 10 mm crassa. Bacca circiter 1.5 mm longa. 
Luzon, Province of Ilocos Sur, Cuming 1144, masc. : Province of Bataan, Lamao 
River, Whitford 1280, masc.: Province of Pampanga, Mount Abu, Bur. Sci. 1989 
Foxworthy ; Arayat, Merrill 1448, fern.: Province of Laguna, Elmer 8201, masc.; 
Lilio, Bur. Sci. 6014 Robinson, fern. : Province of Tayabas, Infanta, Whitford 
852, masc., Bur. Sci. 6805, masc., 6806, fern., Robinson: Province of Nueva Ecija, 
San Jose to Carranglang, Merrill 238: Province of Albay, Mount Mayon, Bur. Sci. 
6462 Robinson, fern. Polillo, Bur. Sci. 6918, 6966 Robinson, fern., Bur. Sci . 
10235 McGregor. Mindoko, For. Bur. 5512 Merritt. Cebu, Catmon, For. Bur. 
12434 Danao, fem. 
Forma b. 
Piper Warburgii C. DC. in Perk. Frag. FI. Philip. (1905) 159, quoad speeimina 
feminea. 
Limbis utrinque magis rotundatis, 15-17 cm longis, 8—11 cm latis. 
Luzon, Province of Tayabas, Sampaloc, Warburg 13115 : Province of Pampanga, 
Mount Arayat, Bolster 21, masc.: Province of Rizal, Tanay, Merrill 2306, fem.: 
Province of Albay, Carcraray Island, Coal Harbor, Bur. Sci. 6401 Robinson. Leyte, 
For. Bur. 11512 Whitford , masc. Marinduque, collector unknown, fem. 
Forma c. 
Piper corylistachyon /3 magnifolium C. DC. Prodr. 1. c. ? 
Piper Warburgii, C. DC. 1. c. quoad speeimina mascula. 
Piper Usterii C. DC. in Usteri Beitr. Kenn. Philip. Veg. (1905) 125. 
Limbis basi leviter inaequilatera utrinque acutis, usque ad 19 cm 
longis et 9 cm latis, ramulis in sicco fuscis. 
Luzon, Province of Tayabas, Atimonan, Whitford 133, masc.: Province of Ca- 
marines, Nueva Caceres, For. Bur. 11332 . Curran. Mindoro, Bongabong River, 
For. Bur. 4113 Merritt ; Lake Naujan, For. Bur. 6815 Merritt ; Baco River, Mc- 
Gregor 331, fem. Samar, Lanang, Merrill 5236, fem. Guimaras, TJsteri. 
Found also in New Guinea. 
Forma d. 
Piper luzonense C. DC. Prodr. 1. c. 350. 
Limbis basi fere aequilatera cordatis, 12-15 cm longis, 9-10 cm latis. 
Luzon, Jagor 122 in herb. Berol. 
Forma d, 2. 
Spicis maturis brevioribus et crassioribus, 3 cm longis, 5 mm crassis, 
bracteae pelta subangulosa. 
Luzon, Province of Tayabas, Atimonan, Gregory 110, fem., in thickets. 
49. Piper retrofractum Vahl Enum. 1 (1804) 314; C. DC. in Urban Symb. 
Antil. 3:212. 
Chavica officinarum Miq. Syst. Pip. (1843) 236, Illustr.- (1844) 39, t. 34- 
Piper officinarum C. DC. Prodr. 1 6 1 (1869) 356. 
Omnino glabrum, foliis breviter petiolatis, oblongo- vel ovato-ellipticis, 
basi aequilatera vel leviter inaequilatera acutis vel obtusis vel cordulatis, 
apice acute acuminatis attenuatisve, penninerviis nervo centrali usque 
