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Osmadenia tenella
About Osmadenia (Osmadenia tenella) 0 Nurseries Carry This Plant Osmadenia is a genus of flowering plants in the daisy family. It contains the single species Osmadenia tenella, which is known by the common name false rosinweed. Osmadenia tenella is native to the coastal plains and the hills and canyons of the Transverse Ranges in Southern California, and the Peninsular Ranges in Southern California and Baja California. It is an uncommon member of the flora in local habitats, such as the coastal sage and chaparral and montane chaparral and woodlands sub-ecoregions. Osmadenia tenella is a hairy, glandular, aromatic annual herb producing an erect stem approaching 40 centimeters (16 inches) in maximum height with threadlike branches. The linear leaves are alternately arranged, the largest low on the plant measuring up to 5 centimeters. The inflorescence is a cyme of several flower heads. Each head has 3 to 5 three-lobed ray florets which are white or pink-tinged and often have a pink spot, and several narrower disc florets. The fruit is an achene; those arising from disc florets have pappi.
Plant Description
Plant Type
Plant Type
Annual herb

1.3 ft tall

Landscaping Information
Natural Setting
Annual Precipitation: 9.6" - 34.0", Summer Precipitation: 0.20" - 2.65", Coldest Month: 39.6" - 56.6", Hottest Month: 65.1" - 80.6", Humidity: 0.99" - 27.17", Elevation: 26" - 5439"

Alternative Names
Common Names: False Rosinweed

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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