Perideridia howellii

Perideridia howellii is a species of flowering plant in the family Apiaceae known by the common name Howell's yampah.[1] It is native to the mountains of Oregon and northern California, where it grows in moist soils, often near streams and rivers.[2] It is a perennial herb which may exceed 1.5 metres in maximum height, its slender, erect stem growing from a cluster of many narrow fibrous roots measuring up to 15 centimetres long.[2] Leaves near the base of the plant have lance-shaped blades up to half a metre long which are divided into many leaflets made up of toothed, oval segments.[2] Leaves higher on the plant are similar, but generally smaller. The inflorescence is a compound umbel of many spherical clusters of small white flowers.[2] These yield ribbed, oblong-shaped fruits each about half a centimetre long.[2]

Perideridia howellii
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Apiales
Family: Apiaceae
Genus: Perideridia
Species:
P. howellii
Binomial name
Perideridia howellii
(J.M.Coult. & Rose) Mathias

References
  1. USDA Plants Profile
  2. Jepson Manual Treatment


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