407 
Taste XII1I—Continued. 
Name of plant. _ A. B. C. 
Pe MerOROOI UM OMIIGUUIN on. ne oo a eee eence 1 .29 44 
bay gf (NMI Stoo fo 1 AS SS a ae SSR Peep a NUE Sas L 20 . 22 
os tide Vines wnateghih C Meecased ok ea L 29 .22 
87. Spondias mangifera________ ES CLO a 7 Us pnd ee 
ik Mlgdink Wilatland se 7 29 1.19 
MeeMMsiitie So ee 1 29 1. 66 
re eee ae 1 Ra aed ea 
OU SB: Sets 2d ene mee a a aa | ei. 1 he en Bee 
a ee ae eee ee 1 yy es pl eee ye 
OWE TB snd AS Sg LC eee et v4) poem Ree ess Fes 
Relation of vegetation to topography.—As previously stated, the La- 
mao River is distinctly an eroding one. At the altitude of the above 
plot there is a fall of 7 in a total distance of 300 meters; at high water 
the stream floods some portions of the terrace and maintains one prom- 
inent channel through it. This leaves the terrace divided into two 
parts; one, which is made up of large boulders, is from 2 to 24 meters 
above the river and stands between it and the flooded channel ; the other, 
somewhat higher, lies at the base of the adjoining hill, and though it 
contains some boulders, yet these are more or less covered with surface 
wash from the slopes of the hill. A very small amount of silt is deposited 
between the rocks in extreme floods, when nearly all of the boulder 
terrace is under water for a short time. The absence of much soil and 
the periodic presence of a swift current make it a difficult place for plants 
to gain a foothold, consequently the vegetation is more or less open. 
The wet-weather channel is more or less destitute of vegetation during 
the rainy season because of the swift currents periodically sweeping 
through it. During the dry one, many young plants of Pandanus luzon- 
ensis, Hugenia luzonensis, and others spring up, only to be to a great 
extent washed out during the following wet period. The vegetation on 
the boulder flood-plain is very much like that encountered in some 
portions of the Bambusa-Parkia formation. Anisoptera vidaliana, 
Lagerstremia speciosa, Dracontomelum cumingianum, Parkia roxburghii, 
Cananium villosum, and Zizyphus zonulatus are here present. 
On the borders of the wet-weather channel and of the stream Hugenia 
luzonensis, Bischofia trifoliata, Sarcocephalus cordatus, and Kleinhofia 
hospita (Pl. VI) are characteristic and, so far as the Lamao Reserve is 
concerned, are found in no other ecological situation. The terrace at 
the foot of the hill shows a condition similar to that on the adjoining 
