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3. Eucnide rupestris (Baillon) H. J. Thompson & W. R. Ernst, J. Arnold Arbor. 48: 86. 1967.
Loasella rupestris Baillon, Bull. Mens. Soc. Linn. Paris 1: 650. 1887; Sympetaleia rupestris (Baillon) A. Gray ex S. Watson
Herbs, annual, spindle-shaped (often nearly as wide as tall). Leaves: blade slightly lobed. Pedicels (fruiting) to 2 cm, usually nodding. Flowers radially symmetric; corolla essentially tubular, petals connate 9 mm, 2-colored, yellow to brown basally, green distally, ovate, to 15 mm; stamens 15, inserted in upper portion of corolla tube, included, projecting toward style; filaments to 5 mm, shorter than anthers. 2n = 42.
Flowering Mar–May. Rocky slopes, washes; 10–500 m; Ariz., Calif.; Mexico (Baja California, Sinaloa, Sonora).
Eucnide rupestris is endemic to the Sonoran Desert.
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