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Boechera macounii (S. Watson) Windham & Al-Shehbaz Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Harvard Papers in Botany 11(2): 267. 2007. (Harvard Pap. Bot.) Name publication detail
 

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

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58. Boechera macounii (S. Watson) Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 267. 2007; Arabis macounii S. Watson, Proc. Amer. Acad. Arts 26: 124. 1891; A. microphylla Nuttall var. macounii (S. Watson) Rollins, Rhodra 43: 428. 1941; Boechera microphylla (Nutt.) Dorn var. macounii (S. Watson) Dorn, Vasc. Pl. Wyoming, ed. 3, 376. 2001. TYPE: Canada, British Columbia: Revelstoke, 13 May 1890, John Macoun s.n. (holotype, GH!; isotypes, CAN!, CAS!, K!, MO!, NY!, US!).

Arabis densicaulis A. Nelson, Bot. Gaz. 30: 190. 1900. TYPE: United States, Wyoming, Park Co., Yellowstone National Park, Undine Falls, 6 Jul 1899, Aven Nelson & Elias Nelson 5680 (holotype, RM!; isotypes, E!, K!, MO!, NDG!, NMC!, NY!, RM!, US!).

     Plants mostly long-lived perennials, often with woody caudices, lacking crowded, persistent leaf bases; apomictic, with spheroid pollen. Stems 1 or several per caudex branch, arising near ground surface from margin or center of basal rosettes, 2.0–3.6 dm, lower parts with abundant simple and short-stalked, 2-rayed trichomes 0.1–0.8 mm, upper parts glabrous. Leaves at stem bases oblanceolate to linear-oblanceolate, 1–3(–5) mm wide, entire or minutely toothed, ciliate proximally with simple trichomes to 0.7 mm, blade surfaces densely pubescent with short-stalked, 3–6-rayed trichomes 0.07–0.30 mm; cauline leaves (5–)9–16, often concealing stem proximally, the uppermost glabrous, with auricles 0.5–1.5 mm. Inflorescences mostly unbranched, 10–33-flowered; fruiting pedicels 5–13(–17) mm, divaricate-ascending to horizontal, straight, with few appressed, branched trichomes or rarely glabrous. Flowers divaricate-ascending at anthesis; sepals pubescent; petals lavender to purple, 4–5 ´ 0.5–0.8 mm, glabrous; ovules 56–78 per fruit. Fruits 3.5–6.5 cm ´ 0.8–1.2 mm, divaricate-ascending to descending, not appressed to rachises, not secund, usually curved, with parallel edges, glabrous; style 0.1–0.4 mm. Seeds uniseriate, 1.0–1.2 ´ 0.7–1.0 mm; wing often continuous, 0.05—0.15 mm wide.

Flowering: May–Jul.

Habitat: rocky hillsides in open pinewoods.

Elevation: 2200–2900 m.

Distribution: Canada (British Columbia), United States (Idaho, Montana, Wyoming).

 

 

 
 


 

 
 
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