pee 
a? he ORR aS ee ee eT ee 
tia re 
414 
Atalantia disticha, Memecylon edule, Dimorphocalyx longipes, Xylopia 
dehiscens, Tabernemontana pandacaqui, and Ixora cumingi are found 
at the extreme upper limits of the plot and with others in the adjacent 
territory very much resemble the low parang vegetation. Indeed, the 
entire brow of the hill is covered with the tangled growth of the climbing 
bamboo, Dinochloa diffusa. Of the mesophytic species Strombosia phil- 
ippinensis and Gnetum gnemon are representative. While they are 
prominent in the subplot E, yet they occupy the lower half of it. (See 
Pl. XV.) Asa rule the Dipterocarpacee are found to be best developed 
in Plots C. and D. Here the slope is more gentle. 
A comparison of the entire hillside with the river terrace shows dif- 
ferences other than those which have been mentioned. Anisoptera 
vidaliana, occupying first place in the river terrace, stands eleventh on 
the hillside. Palaquiwm luzoniense is very common below, but it is 
represented only by a few scattered specimens above. A reference to 
columns H and I of Table XIV and B and C of Table XIII will strik- 
ingly show these differences. To give a better idea of the complexity» 
of the floristic composition of the forest and of the differences due to 
physiographic situations, six other plots were made in this Antsoptera- 
Strombosia formation. 
Description of Table XV. 
This table classifies plots in various physiographic situations of the Anisoptera- 
Strombosia formation. A, forest on a slope of 10 to 12° gradient at an altitude 
of 100 meters. The plot comprises an area of 1500 square meters. B, forest on a 
terraced island at an altitude of 80 meters. This terrace is under water for a 
very short time at extremely high floods. The plot comprises an area of 600 
square meters. ©, plot in the river terrace a little higher than B. It is near 
the mouth of a wet-weather stream and is flooded at the highest water. It is 
near Plot A and comprises about 800 square meters. D, plot on a terrace about 
2 meters higher than B. The plot comprises an area of 1,400 meters. E, plot 
on a level bench at 250 meters altitude. It comprises an area of about 800 
square meters. F, plot on a gentle slope at the top of a ridge at 190 meters 
altitude. It comprises an area of 750 square meters. 
TABLE XV: 
—$+— - a flan Syst Mir SoM PceeN 
| Name. ie | B. 1am | E. F. | 
|} —} 
| 1, Aphananthe philippinensis -_-----__ -_-.___. 5 | 27 27'|.-------|---=---- 59 | 
2. Anisoptera vidaliana _-_..---------- st) 8 13 6 | 8 4 48 
| 8, Lagerstroemia speciosa -__-..-.------|-------- 7 | 13 | We ldeact wise swcawowen 39 
| 4. Canarium villosum_-------.--------- | bt tes Nene 3 | 9 | 14 | RBS al UA GRE ge 26 
|. 5: Memecylon edule ___-.._---.4.<-..- Beto 4 7 11] 1 ye eae | 
| 6, Dipterocarpus vernicifluus_________- t4 RARE 40 2 4 19 
| 7. Artocarpus communis__.------------ Pigaitcmend 3 3 | 2 ee 1236.4 
8. Koordersiodendron pinnatum ___-_- | 38 4 3 | 1 3 1| 15 
9. Shorea polysperma----...----------- is Ee Bret aren eae 10 5 15 | 
10. Shorea contorta --..--.-------------- | ‘a ana Se cS dee = ah ae 10 4| 14 
11. Grewia stylocarpa__-__--- ie vp “alee Ses | 8 ieoutek | aaticuaa| sian 4 6| 18 | 
| \ | 
