Common St. John's Wort (Hypericum perforatum)

2013-7-21 Newark Oaks, DE
-spotted only near the margins
common names:
Klamathweed
St. John's wort
common St. John's wort
http://plants.usda.gov/core/profile?symbol=HYPE
many pictures:
http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Hypericum+perforatum

Hypericum punctatum
-spots or lines on petals and sepals (where perforatum is only at the margin)
-can grow three feet tall
"The leaves are up to about 2.75 inches long. They are blunt-tipped, unlike the similar dotted St. Johnswort - Hypericum pseudomaculatum (False Spotted St. Johnswort.)"
https://uswildflowers.com/detail.php?SName=Hypericum%20punctatum
http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Hypericum+punctatum

Variety pseudomaculatum (Bush) Fern. has larger flower, glaucous triangular leaves which are acute, and longer styles than var. punctatum. Each of these varieties has two forms also.
http://www.missouriplants.com/Yellowopp/Hypericum_punctatum_page.html

this site has examples of flowers and long lists of other references/resources:
http://www.uniprot.org/taxonomy/65561