Tule Ponds at Tyson

Italian Buckthorn 
Family Rhamnaceae (buckthorn)
Rhamnus alaternus 

This evergreen shrub has an irregular upright form with a dense canopy. Medium height about 5-7 meters with a spread of about 5 meters.  Leaves are dark green, serrated, glossy,  and oval about 5 cm in length.  It is valued as a tough, low-maintenance street tree. Appropriate beneath overhead wires. Disease and pest resistant and attracts birds


Blue Pennyroyal
Family Lamiacea (mint) 
Mentha pulegium

This European native mint is common throughout the Bay Area in low areas that are marshy all winter, but dry in summer.  It is a low-lying plant with small oval or elliptical leaves. In late summer, its deep lavender purple pom-pom like flowers gives color to the marsh. The leaves may be used in stuffing or boiled to make tea.  No parts of this plant should be eaten by pregnant women because it is an abortive.


Family Rosaceae (rose)
Prunus armeniaca

The old apricot trees at the north end of the Lagoon are remnants of  a commercial orchard that once occupied this site.  Apricots provide food for wildlife, including raccoons, opossums, and house finches.

Yellow Myrobalan, Cherry Plum
Family Rosaceae (rose)
Prunus sp.

Myrobalan plants are some of the largest and most vigorous of the plum or prune woodstocks.  They are hard and long lived.  Commercial fruit trees would be grafted onto this tree because they are more resistant than the preferred fruit.

Himalayan Blackberry   
Family  Rosaceae (rose)
Rubus discolor

This non-native woody shrub is found in woodlands, marshes, riparian areas, and parks.  It looks similar to the California blackberry except for leaf shape and thorns.  The stems bear large, stout spines.  Its leaves are divided into 5 large leaflets that are silvery on the underside.  This species is originally from Eurasia, and is very aggressive in its spread, growing up to 10 feet per year.  The flowers are white to pinkish. 

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