JOURNAL #2
On our trip to Lower Arroyo, I observed Chenopodium (assuming it is an Chenopodium atroviren), Hirschfeldia (assuming it is Shortpod Mustard: introduced in California), Black willow (native in the United States), Texas prickly-pear, Coast live oak, Wild buckwheats, Grapevines, Pennisetum (nonnative), Privets (nonnative), Smooth alder, and Victorian box (introduced). According to iNaturalist, both Shortpod mustard and Victorian box were introduced which means that human activity brought the plant to California; as a result, I will consider these plants nonnative. As of now, the ratio between native and nonnative plants is 8: 3. The ratio is currently not bad. Lower Arroyo is located under a bridge; therefore, it is less natural since people are able to throw stuff over it.
Reference:
https://www.inaturalist.org/taxa/53097-Hirschfeldia-incana
http://www.calflora.org/cgi-bin/species_query.cgi?where-taxon=Eriogonum+latifolium
https://www.inaturalist.org/taxa/76270-Chenopodium-atrovirens
https://www.inaturalist.org/taxa/54847-Salix-nigra
https://www.inaturalist.org/taxa/78264-Opuntia-engelmannii
https://www.inaturalist.org/taxa/47850-Quercus-agrifolia
https://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=8321
http://www.calflora.org/cgi-bin/specieslist.cgi?where-genus=Pennisetum
https://www.inaturalist.org/taxa/56033-Alnus-serrulata
https://www.inaturalist.org/taxa/51594-Pittosporum-undulatum
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