- Boechera hoffmannii
taxobox
name = "Boechera hoffmannii"
status = EN
regnum =Plantae
unranked_divisio =Angiosperms
unranked_classis =Eudicots
unranked_ordo =Rosids
ordo =Brassicales
familia =Brassicaceae
genus = "Boechera "
species = "B. hoffmannii"
binomial = "Boechera hoffmannii"
binomial_authority = (Munz) Al-Shehbaz
synonyms = "Arabis hoffmannii"|"Boechera hoffmannii" (formerly "Arabis hoffmannii") is a rare species of flowering plant in the mustard family known by the common name Hoffmann's rockcress. It is endemic to the
Channel Islands of California , where it is known from only three or four populations on two of the eight islands. [http://www.centerforplantconservation.org/ASP/CPC_ViewProfile.asp?CPCNum=178 Center for Plant Conservation Profile] ] It is a federally listedendangered species . This is a perennial herb producing one or more erect stems from a scaly, hairycaudex . The stems reach a maximum height between 50 and 70 centimeters and branch near the top. Leaves are densely clustered around the caudex in a basal rosette. They are lance-shaped, leathery with hairy undersides, and up to 10 centimeters long. There are more widely-spaced leaves along the stem which are 3 to 6 centimeters long. Theinflorescence bears many white or purple flowers with thick, darksepal s. The fruit is a tough, hairlesssilique up to 10 centimeters long containing 2 rows of seeds. The main threats to the existence of this rare plant are grazing and erosion caused byferal pig s and competition by invasive grasses. The populations of this plant are also slow to reproduce. They aremonocarpic , with each individual living for a few years, fruiting once, and then dying, and each population has relatively few actively reproducing individuals in any given year.References
External links
* [http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?2240,2250,2272 Jepson Manual Treatment]
* [http://plants.usda.gov/java/profile?symbol=ARHO USDA Plants Profile]
* [http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Arabis+drummondii Photo gallery]
Wikimedia Foundation. 2010.