Lactuca biennis

Taxobox
name = "Lactuca biennis"


image_width = 200px
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
tribus = Cichorieae
genus = "Lactuca"
species = "L. biennis"
binomial = "Lactuca biennis"
binomial_authority = (Moench) Fernald
synonyms = "Lactuca spicata"

"Lactuca biennis" is a species of wild lettuce known by the common names tall blue lettuce and blue wood lettuce. It is native to the eastern half of the United States and Canada, but it can also be found in much of the western half as an introduced species. This is a biennial herb in the daisy family growing from a taproot to heights anywhere from one half to four meters. There are deeply lobed, toothed leaves all along the stem. The top of the stem bears a multibranched inflorescence with many flower heads. Each head is just over a centimeter wide and has many whitish to light blue ray florets. The fruit is a mottled achene about half a centimeter long with a brownish pappus.

External links

* [http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1466,1467 Jepson Manual Treatment]
* [http://plants.usda.gov/java/profile?symbol=LABI USDA Plants Profile]
* [http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Lactuca+biennis Photo gallery]