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Oil Neststraw
Stylocline citroleum
About Oil Neststraw (Stylocline citroleum) 0 Nurseries Carry This Plant Stylocline citroleum is a rare species of flowering plant in the aster family known by the common name oil neststraw. It is endemic to Kern County, California, where it is known from about 46 occurrences on and around the Elk Hills Oil Field. The occurrences are patchy and variable in size, and some sources consider them to be part of a single widely spread metapopulation. The species has been collected from coastal San Diego County, but any occurrences there are probably now extirpated. The plant has been known for over one hundred years, and the type specimen was collected in 1935, but it was not described to science as a distinct species until 1992. Stylocline citroleum grows in the valley saltbush scrub ecosystem in the sandy flats and clay soils of the San Joaquin Valley in areas developed into oil fields, the inspiration for the common and scientific names of the species. The plant probably evolved as a hybrid of mountain neststraw (Stylocline gnaphaloides) and California filago (Filago californica), and it is almost always found growing alongside one or both of its parent species. This inconspicuous annual herb produces a grayish, trailing, forking stem no more than 13 centimeters long. The grayish, woolly, pointed leaves are up to 1. 4 centimeters long. The inflorescence bears spherical flower heads just a few millimeters long with tiny, rough-haired phyllaries and scaly, woolly florets. It is hard to tell apart from other Stylocline because its defining characteristics are microscopic.
Plant Description
Plant Type
Plant Type
Annual herb

Landscaping Information
Natural Setting
Annual Precipitation: 6.0" - 7.7", Summer Precipitation: 0.12" - 0.20", Coldest Month: 50.6" - 51.8", Hottest Month: 77.1" - 78.1", Humidity: 3.79" - 26.67", Elevation: 417" - 1080"

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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