406 
DE CANDOLLE. 
Most of the Malayan Piperaceae are missing in the Philippines, as is 
also the case with those of New Guinea, Samoa, and Yiti, of which 
I. have just made a special study. In fact the Philippines certainly 
possess a very large number of endemic Piperaceae. While a great 
majority of the species seem to be narrowly localized, it is interesting 
to note that some are, on the contrary, widely spread in the various 
Islands. Striking examples of widely distributed but endemic species 
are furnished by such species as Piper marivelesanum, P. albidirameum , 
P. abbreviatum, and P. pseudochavicaj Piper corylistachyon , a species 
which has hitherto been known only from the Philippines, and which 
is well characterized by the structure of its anthers, is also disseminated 
all over the Archipelago, but it is not strictly endemic, one of its forms 
having been recently collected in New Guinea, while Piper Kortlialsii 
Miq., which I have here made the type of a new section of the genus, 
is very widely distributed in the Philippines, and is also found in 
Sumatra. 
All measurements mentioned in this revision are taken from dried 
specimens. The foliar characters indicated in the diagnoses and keys 
always refer to the leaves from the upper part, that is to say, of the 
flowering part of the branches, and the width of the leaves is taken 
from their widest portions. 
PEPEROM I A Ruiz & Pavon. 
KEY TO THE PHILIPPINE SPECIES. 
1. Leaves opposite. 
2. Limb of leaves glabrous, elliptic, up to 3.7 cm long and 1.7 cm wide. 
1. P. lagunaensis 
2. Limb of leaves pubescent on both surfaces. 
3. Limb elliptic, up to 12.5 cm long, and 8 mm wide 2. P. canlaonensis 
3. Limb oblong- or obovate-elliptic, 17 mm long, 6 mm wide. 
3. P. Ventenatii (3 pubescens 
3. Limb elliptic-lanceolate, 22 to 30 mm long, 12 to 17 mm wide. 
4. P. recurvata forma pilosior 
3. Limb obovate, cuneate at the base, up to 25 mm long. 
4. P. recurvata forma longispica 
1 . Leaves in whorls. 
2. Raehis glabrous. 
3. Limb glabrous, obovate-elliptic, 12 to 20 mm long, 8 to 10 mm wide. 
5. P. rubrivenosa 
3. Limb pubescent, ovate-elliptic or subrhomboid, up to 25 mm long and 18 
mm wide 1 - 6. P. tomentosa 
2. Racliis pubescent; limb elliptic or rounded, 8 to 10 mm long, 6 to 8 mm 
wide, glabrous or more or less pubescent 7. P. reflexa 
1. Leaves alternate. 
2. Limb of leaves quite glabrous. 
3. Stigma inserted a little below the top of the ovary. 
4. Limb ovate-rounded, up to 17 mm long and wide 8. P. lanaoensis 
