A REVISION OF PHILIPPINE PIPERACEAE. 
431 
cm longi et 9 cm lati. Petioli usque ad limbi latus longius 6 mm, inter 
limbi latera 1 mm longi. Spica florens 17 mm longa et 6 mm crassa. 
Luzon, Province of Benguet, Twin Peaks, on rocks in shady places, Elmer 6430, 
May. 
32. Piper Betle L. Sp. PI. (1753) 28, ? d. 2 (1762) 40. 
Foliis modice vel longe petiolatis, superis ovatis basi leviter inaequila- 
tera rotundatis apice acute acuminatis, utrinque glabris, plerumque 7- 
plinervis, nervo centrali fere e quinta parte longitudinis suae nervos ad- 
scendentes 1 vel 2 mittente, nervis lateralibus 2 a basi solutis; petiolo 
glabra usque ad tertiam ad quartam partem longitudinis vaginante; 
pedunculo glabro in mare petiolum aequante in femina eum superante; 
stirpis masc. spica adulta folii limbum eaquante, rhachi hirsuta, bractea 
glabra rotundata vel obovata centro sessili, staminibus 2 antheris ellipticis 
cum filamentis brevibus aequilatis; stirpis fern, spica quam folii limbus 
plus minusve breviore, bractea ut in mare, ovario inf erne in rhachi immerso 
superne umbonato et ut rhachis dense tomentoso, stigmatibus 4 vel 5 
lanceolatis. 
Dioicum, scandens. Eamuli glabri, spiciferi 2.5 mm crassi, eollen- 
chyma continuum vel subcontinuum sparsim libriforme, fasciculi intra- 
medullares 1-seriati, canales lysigenes plures quorum unus centralis, alii 
peripherici plures, eellulae fuscescentes in cortice et in medulla creber- 
rimae. Limbi in sicco firmo-membranaeei quam minutissime pellucido- 
punctulati, superi usque ad 10—13 cm longi et 6. 5-7.5 cm lati. Petioli 
1.5-2. 5 cm longi. Stirpis masculae spicae 2 mm, femineae maturae 1 cm 
et plus crassae. 
Luzon, Province of Bataan, Lamao River, in forests, altitude about 100 m, 
Merrill 3781, masc., January, Whitford 188, May; Dinalupijan, Merrill 1561, 
December: Province of Laguna, Elmer 9276, fern., April. Negbos, Dumaguete, 
Elmer 9573, fern. 
Cultivated in all tropical countries. 
Forma b. 
Piper canaliculatum Opiz in Presl Rel. Haenk. 1 ( 1828 ) 156. 
Piper Betle Linn. y. densum C. DC. Prodr. 1 6 1 (1869) 360. 
Limbis magis ovatis et basi magis inaequalibus usque ad 14 cm longis 
et 9 cm latis. 
Luzon, Haenlce 69: Province of Rizal, San Francisco del Monte, Loher 4665. 
Forma c. 
Piper philippinense C. DC. 1. c. 353. 
Limbis superis minoribus usque ad 10 cm longis et ad 5 cm latis, 
canales lysigenes peripherici in ramulo nulli. 
Luzon, Province of Bataan, Lamao River, Merrill 2526, fen}., June, Williams 
511, masc.: Province of Cavite, Mendez Nunez, Bur. Sci. 1314 Mangubat, August. 
