Camissonia arenaria (A.Nelson) P.H.Raven
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Authority
Raven, Peter H. 1969. A revision of the genus Camissonia (Onagraceae). Contr. U. S. Natl. Herb. 37: 161-396.
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Family
Onagraceae
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Scientific Name
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Type
Type: Sandy washes in the Fortuna Range (western Gila Mountains), ca. 20 miles east of Yuma, Yuma County, Arizona, 26 February 1930, A. Nelson 10140 (RM 138602).
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Description
Description - Plants to 1.8 m. tall, villous, occasionally with scattered glandular trichomes in the inflorescence. Leaves reduced upward, the petioles to 6 cm. long, the blades to 6 cm. long and 6 cm. wide, villous above and densely so below, ovate, cordate at the base, the apex sometimes acuminate, coarsely dentate or doubly dentate. Inflorescence less compact than that of C. cardiophylla. Hypanthium 18-40 mm. long, 5-8 mm. across at the summit, villous without, finely pubescent within. Sepals 8-15 mm. long, 3-5.5 mm. wide. Petals 8-20 mm. long, 7-28 mm. wide. Filaments 5-9 mm. long; anthers 5-8 mm. long. Style 30-58 mm. long; stigma 2.5-3 mm. thick, held above the anthers at anthesis. Capsule 3-4.4 cm. long, 2.5-3.5 mm. thick; pedicel 2-5 mm. long. Seeds 0.5-0.7 mm. long. Gametic chromosome number, n= 7. Outcrossed.
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Discussion
This species has twice been found growing sympatrically with C. cardiophylla subsp. cardiophylla, but no intermediates have been observed.