Perideridia howellii
Encyclopedia
Perideridia howellii is a species of flowering plant in the carrot family
known by the common name Howell's yampah. It is native to the mountains of Oregon
and northern California
, where it grows in moist soils, often near streams and rivers. It is a perennial herb which may exceed 1.5 meters in maximum height, its slender, erect stem growing from a cluster of many narrow fibrous roots measuring up to 15 centimeters long. Leaves near the base of the plant have lance-shaped blades up to half a meter long which are divided into many leaflets made up of toothed, oval segments. Leaves higher on the plant are similar, but generally smaller. The inflorescence
is a compound umbel
of many spherical clusters of small white flowers. These yield ribbed, oblong-shaped fruits each about half a centimeter long.
Apiaceae
The Apiaceae , commonly known as carrot or parsley family, is a group of mostly aromatic plants with hollow stems. The family is large, with more than 3,700 species spread across 434 genera, it is the sixteenth largest family of flowering plants...
known by the common name Howell's yampah. It is native to the mountains of Oregon
Oregon
Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
and northern California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, where it grows in moist soils, often near streams and rivers. It is a perennial herb which may exceed 1.5 meters in maximum height, its slender, erect stem growing from a cluster of many narrow fibrous roots measuring up to 15 centimeters long. Leaves near the base of the plant have lance-shaped blades up to half a meter long which are divided into many leaflets made up of toothed, oval segments. Leaves higher on the plant are similar, but generally smaller. The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...
is a compound umbel
Umbel
An umbel is an inflorescence which consists of a number of short flower stalks which are equal in length and spread from a common point, somewhat like umbrella ribs....
of many spherical clusters of small white flowers. These yield ribbed, oblong-shaped fruits each about half a centimeter long.