Apium graveolens L.
Wild celery, introduced from Europe and now widespread in the United States. In New Mexico is frequents moist montane habitats; I have seen it in the Sacramento and Jemez Mountains. Without open inflorescences, it can easily be confused with Rudbeckia laciniata.
Plant habit at San Pedro Parks, Jemez Mountains, Rio Arriba County, New Mexico, 25 Jun 2010.
An inflorescence at San Pedro Parks, 25 Jun 2010.
Abaxial view of an umbellet, showing the involucel as a small disk, 25 Jun 2010.
A cauline leaf at San Pedro Parks, 25 Jun 2010.