Ivesia longibracteata
Encyclopedia
Ivesia longibracteata is a rare species of flowering plant in the rose family
known by the common name Castle Crags ivesia. It is endemic to Shasta County, California
, where it is known only from Castle Crags
. It grows in rocky granite
habitat in the temperate coniferous forest.
is a headlike cluster of several flowers 1 or 2 centimeters wide. Each flower is just under a centimeter long and has tiny pale yellow petals.
Rosaceae
Rosaceae are a medium-sized family of flowering plants, including about 2830 species in 95 genera. The name is derived from the type genus Rosa. Among the largest genera are Alchemilla , Sorbus , Crataegus , Cotoneaster , and Rubus...
known by the common name Castle Crags ivesia. It is endemic to Shasta County, California
Shasta County, California
Shasta County is a county located in the northern portion of the U.S. state of California. The county occupies the northern reaches of the Sacramento Valley, with portions extending into the southern reaches of the Cascade Range. As of the 2010 census, the population was 177,223, up from 163,256...
, where it is known only from Castle Crags
Castle Crags
Castle Crags is a dramatic and well-known rock formation in Northern California. Although the mountains of Northern California consist largely of rocks of volcanic and sedimentary origin, granite bodies intruded many parts of the area during the Jurassic period...
. It grows in rocky granite
Granite
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...
habitat in the temperate coniferous forest.
Description
Ivesia longibracteata is a perennial herb forming a glandular green tuft of foliage where it grows from crevices in granite rock. The leaves are 2 to 4 centimeters long and are made up of several pairs of lobed leaflets. The inflorescenceInflorescence
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 headlike cluster of several flowers 1 or 2 centimeters wide. Each flower is just under a centimeter long and has tiny pale yellow petals.