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Last Addition: June 25, 1999
Each "thumbnail" image below is linked to a larger photograph.
Calycadenia oppositifolia is a geographically restricted, uncommon species found primarily, if not exclusively, in the Sierra foothills of Butte County at elevations below 900 m. In C. oppositifolia, all of the leaves are opposite, whereas in all other species of the genus the upper leaves are alternate. The flowers are white, occasionally with reddish hues on the tube of the corolla of ray flowers. The chromosome number is n = 7. Natural hybridization with C. multiglandulosa probably occurs in a very narrow zone of sympatry on the southern edge of the distribution of C. oppositifolia. The similarity of these species at this site would make it difficult to identify spontaneous hybrids. Calycadenia oppositifolia has been artificially hybridized with C. fremontii, C. multiglandulosa, C. pauciflora, and C. spicata.
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Jarbo Gap population in Butte County. Note the opposite leaves extending to the top of the stem axis in the second photo. | ||
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Individual in the Cohasset Road population on a very bad year. Note the stunted growth and extremely dry conditions. Very few individual survived to flower on this year. | ||
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Heads of greenhouse-grown progeny from Butte County, vicinity of Ponderosa Way. Note multiple tack-shaped glands on peduncular bracts and phyllaries occasionally with a small, terminal tack-shaped gland. | ||
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Head of greenhouse-grown progeny from Ponderosa Way. Note corolla of ray flowers more deeply and evenly lobed than those of C. multiglandulosa. | ||
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Ray and disk flowers from progeny of fruits collected near Paradise. |