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Published In: Harvard Papers in Botany 11(2): 271. 2007. (Harvard Pap. Bot.) Name publication detail

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

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74. Boechera pinetorum (Tidestrom) Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 271. 2007; Arabis pinetorum Tidestrom, Proc. Biol. Soc. Wash. 36: 182. 1923; A. divaricarpa A. Nelson var. pinetorum (Tidestrom) B. Boivin, Canad. Field-Naturalist 65: 16. 1951; A. holboellii Hornemann var. pinetorum (Tidestrom) Rollins, Rhodora 43: 447. 1941; Boechera holboellii (Hornemann) Á. Löve & D. Löve var. pinetorum (Tidestrom) Dorn, Vasc. Pl. Wyoming, ed. 3. 375. 2001. TYPE: United States, Nevada. Douglas Co., coniferous forests N of Glenbrook, along Lake Tahoe, 1890 m, 7 Jul 1919, Ivar Tidestrom 10387 (holotype, US!).

     Plants short-lived perennials, with non-woody caudices, lacking crowded, persistent leaf bases; apomictic, with spheroid pollen. Stems usually 1 per caudex branch, arising near ground surface from center of basal rosettes, 2.0–8.0(–9.6) dm, lower parts with many simple and short-stalked, 2–4-rayed trichomes to 1 mm, upper parts sparsely pubescent or glabrous. Leaves at stem bases oblanceolate, 2–8(–11) mm wide, entire or denticulate, ciliate proximally with simple trichomes 0.5–1 mm, blade surfaces sparsely to densely pubescent with short-stalked, 2–5-rayed trichomes 0.2–0.5 mm, these mixed with fewer simple trichomes; cauline leaves 7–33, often concealing stem proximally, the uppermost sparsely pubescent or glabrous, with auricles 1–3 mm. Inflorescences mostly unbranched, 15–63-flowered; fruiting pedicels 4–12 mm, reflexed, abruptly recurved near base but otherwise straight, with few spreading, simple and 2-rayed trichomes or glabrous. Flowers divaricate to pendent at anthesis; sepals pubescent; petals white to lavender, 5–6 ´ 1.0–1.5 mm, glabrous; ovules 70–110 per fruit. Fruits (4.5–)5.5–8.5 cm ´ 1.5–2.0 mm, reflexed to closely pendent, not appressed to rachises, not secund, straight or curved, with parallel edges, glabrous; style 0.05–0.40 mm. Seeds uniseriate, 1.5–1.8 ´ 1.2–1.5 mm; wing continuous, 0.15–0.30 mm wide.

Flowering: May–Jul.

Habitat: rock outcrops and gravelly soil in meadows and open conifer forests.

Elevation: 1100–3200 m.

Distribution: United States (California; Nevada, Oregon).

Reproductive mode: apomictic triploid.




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