''Physocarpus alternans'' also known as dwarf ninebark and Nevada ninebark is a flowering shrub native to east

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, currently found throughout Western

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

. It was first described by J.T.Howell in 1931. It prefers growing on dry, rocky slopes, grows in pinyon and juniper shrublands, also found near limestone outcrops. It has been found to grown at elevations of 1800 to 3100 m above sea level. Aside from the native California specimens have been collected in

Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...

Idaho Idaho ( ) is a state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Montana and Wyom ...

and

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. It flowers in June and July, producing small, white flowers.

Description

''Physocarpus alternans'' grows to a height of 50 to 150 cm. It forms leaves with 3 to 7 shallow lobes. Leaves possess small, rounded teeth along the margin. Flowers, densely hairy, form in bunches of up to around ten. The hypanthium measures 1.7 to 3 mm in length and up to 3.2 to 5 mm in diameter at the rim. Petals are 2.5 to 3 mm long. The longest filaments measure up to 1.3 to 2.5 mm in length. Fruit are 3.5 to 4 mm in diameter, densely hairy.

References

{{Taxonbar, from=Q15543361 Plants described in 1831 alternans