This section is from the book "Wild Flowers Of The North American Mountains", by Julia W. Henshaw. Also available from Amazon: Wild Flowers of the North American Mountains.
Stems: nearly stemless. Leaves: compound, leaflets pinnately incised, on rather short petioles. Flowers: in a somewhat unequally three-to-ten-rayed umbel. Fruit: flattened dorsally, oblong, laterally winged.
A hairy Parsley much branched at the base from a thick elongated root. The leaves are compound, and the short stalks of the leaflets are purplish at the base. The white flowers grow in flat umbels.
 
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