. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. nicii^ of tin's L;rass. for il is likcK' lo be Ih a^nirilis N'asey, an- I'tluT i)l;int wliirli was tirsl found 1)_\' ( )rcutl in the v'^an Dic^o |)( )o!s. I\c(l llill on a small scale a very clear example of the ecological limitation of plant growths. The vegetation of the mesa is composed of the native and naturalized ]:)lants common everywhere in the region in similar places. Not one of them had intruded on the pools, from which they are excluded by the pres- ence of water at the tim
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. nicii^ of tin's L;rass. for il is likcK' lo be Ih a^nirilis N'asey, an- I'tluT i)l;int wliirli was tirsl found 1)_\' ( )rcutl in the v'^an Dic^o |)( )o!s. I\c(l llill on a small scale a very clear example of the ecological limitation of plant growths. The vegetation of the mesa is composed of the native and naturalized ]:)lants common everywhere in the region in similar places. Not one of them had intruded on the pools, from which they are excluded by the pres- ence of water at the time when their seeds sprout. It would be interesting to observe if they are able to enter in those very dry seasons when the deficient rainfall fails to fill the pools. Of course none of the ]:)lants of the pools are able to ]Dass beyond their narrow limits. With tw^o exceptions they are among the least known plants of Southern California. The exceptions are Psilo- carphns glohifcnts and Navarrctia prostrata, which appear to be not uncommon in desiccated pools in the coastal district of Los Angeles county. But neither the commoner nor the rarer species have been found elsewdiere at any but places remote from this station. Botanists who are acquainted with the location of such winter pools should examine them with care early in the rainy season to ascertain if the rarer plants are not to be found in them. After the more conspicuous plants are in condition for collecting the smaller ones wall probably have entirely disap- 52. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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