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Published In: Harvard Papers in Botany 12(1): 239. 2007. (Harvard Pap. Bot.) Name publication detail

Project Name Data (Last Modified On 7/21/2009)

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24. Boechera duchesnensis (Rollins) Windham, Al-Shehbaz & Allphin, Harvard Pap. Bot. 12: 239. 2007; Arabis pulchra M. E. Jones ex S. Watson var. duchesnensis Rollins, Syst. Bot. 6: 59. 1981; Boechera pulchra (M. E. Jones ex S. Watson) W. A. Weber var. duchesnensis (Rollins) Dorn, Brittonia 55: 3. 2003. TYPE: United States, Utah, Duchesne Co., 3.8 miles east of Duchesne, stony hillside in juniper area, 30 May 1979, Reed C. Rollins & Kathryn W. Rollins 79113 (holotype, GH!; isotypes, 2BRY!, MO!, NY!, RM!, US!).

     Plants mostly long-lived perennials, often with woody caudices, lacking crowded, persistent leaf bases ; apomictic, with spheroid pollen. Stems usually 1 per caudex branch, elevated on woody bases or produced near ground surface, arising from center of basal rosettes, 1.5–4.5 dm, lower parts with abundant, short-stalked, 2–7-rayed trichomes 0.2–0.5 mm (occasionally mixed with a few large trichomes proximally), upper parts sparsely pubescent. Leaves at stem bases linear-oblanceolate, 2–5 mm wide, entire or denticulate, ciliate on petiole base swith simple trichomes to 1 mm, blade surfaces densely pubescent with short-stalked, 4–8-rayed trichomes 0.15–0.40s mm; cauline leaves 3–8, not concealing stem, the uppermost sparsely pubescent, with auricles 0.7–2.0 mm. Inflorescences mostly unbranched, 11–22-flowered; fruiting pedicels 7–14 mm, horizontal, straight or slightly curved, with appressed, branched trichomes. Flowers divaricate-ascending at anthesis; sepals pubescent; petals whitish to pale lavender, 7–10 ´ 1.5–3.0 mm, glabrous; ovules 72–92 per fruit. Fruits 3.5–5.0 cm ´ 1.7–2.0 mm, horizontal, not appressed to rachises, not secund, usually straight, with parallel edges, glabrous proximally, pubescent distally; style 0.1–0.3 mm. Seeds subbiseriate, 1.1–1.3 ´ 0.7–1.0 mm; wing continuous, ca. 0.1 mm wide.

Flowering: May.

Habitat: sandy soil on rocky slopes, mostly in pinyon-juniper woodland.

Elevation: 1300–1800 m.

Distribution: United States (Colorado, New Mexico, Utah).

Reproductive mode: Apomictic triploid.




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