Abstract
A new genus and species,Dedeckera eurekensis, are described from the Last Chance Mountains, Inyo Co., California, from an area just south of the Eureka Valley sand dunes. A member of Polygonaceae, it is most closely related toEriogonum, differing from that genus in lacking a tubular involucre, and fromStenogonum, Hollisteria, Nemacaulis, andGilmania in being a shrubby perennial. It differs from all other members of the subfamily Eriogonoideae in having (1) a head of subsessile or sessile flowers borne on a slender peduncle and subtended by 2 to 5 foliaceous bracts, and (2) a single short-pedicellate axillary flower at the base of each peduncle. The numerous yellow-flowered heads are arranged in open cymose inflorescences that terminate short annually produced branches with alternately arranged exstipulate foliage leaves.Eriogonum flexum is transferred to the genusStenogonum. A key to the genera of subfamily Eriogonoideae is included.
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Jepson, W. L. 1925. A manual of the flowering plants of California. Associated Students Store, Berkeley.
Reveal, J. L. 1969. The subgeneric concept inEriogonum (Polygonaceae), pp. 229–249.In: J. E. Gunckel (edit.), Current Topics in Plant Sciences. Academic Press, New York.
Stebbins, G. L. &J. Major 1965. Endemism and speciation in the California flora. Ecol. Monogr.35: 1–35.
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Field work was supported by National Science Foundation grant GB-22645 and publication costs by grant BMS75-13063.
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Reveal, J.L., Howell, J.T. Dedeckera (Polygonaceae), a new genus from California. Brittonia 28, 245–251 (1976). https://doi.org/10.2307/2805834
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DOI: https://doi.org/10.2307/2805834