Home Brassicaceae
Name Search
Species List
Boechera howellii (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 GardenSearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font

Published In: Harvard Papers in Botany 11(1): 69. 2006. (Harvard Pap. Bot.) Name publication detail

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

Export To PDF Export To Word

47. Boechera howellii (S. Watson) Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 69. 2006; Arabis howellii S. Watson, Proc. Amer. Acad. Arts 25: 124. 1890; A. platysperma A. Gray var. howellii (S. Watson) Jepson, Man. Fl. Pl. Calif. 432. 1925. TYPE: United States, Oregon, Jackson County, Siskiyou Mountains, Ashland Butte, 19 Jul 1887, T. Howell 664 (lectotype, designated by Jepson (Fl. Calif. 2: 72. 1936), GH!; isolectotypes, CAN!, MO!, NDG!, 5NY!, 2ORE!, 2PH!, US!).

Arabis conferta Greene, Repert. Sp. Nov. Regni Veg. 5: 243. 1908. TYPE: United States, California, Tuolumne Co., mountain slopes N Little Kern River,10-11000 ft, Sep 1897, C. A. Purpus 5231 (holotype, US!; isotypes, E!, GH!, K!, MO!, UC!).

Arabis inamoena Greene var. acutatus Jepson, Fl. Calif. 2: 72. 1936. TYPE: United States, California, Tuolumne Co., Young’s Lake, 9900 ft, 31 Jul 1927, F. W. Peirson 7610 (holotype, JEPS!).

Arabis platyloba Greene, Pittonia 4: 198. 1900. TYPE: United States, California, Lassen Co., Lake Solfataro, Lassen’ Peak, Jul 1896, Mrs. R. M. Austin (holotype, NDG!; isotypes, MO!, JEPS!, US!).

Arabis platysperma var. imparata Jepson, Fl. Calif. 2: 72. 1936. TYPE: United States, California, Lassen Co., Lake Solfataro, Lassen’ Peak, Jul 1896, Mrs. R. M. Austin (holotype, JEPS!; isotypes, MO!, NDG!, US!).

     Plants long-lived perennials, with mostly woody caudices, lacking crowded, persistent leaf bases; sexual, ellipsoid pollen. Stems usually 1 per caudex branch, arising near ground surface from center of basal rosettes, 0.6–2(–3) dm, glabrous throughout. Leaves at stem bases narrowly oblanceolate, 1–7 mm wide, entire, ciliate proximally with simple and a few short-stalked, 2-rayed trichomes 0.1–0.4 mm, blade surfaces glabrous; cauline leaves 2–4, not concealing stem, the uppermost glabrous or (rarely) ciliate proximally, with auricles 0.2–1 mm or rarely lacking. Inflorescences unbranched, 2–5-flowered; fruiting pedicels 4–10 mm, ascending, straight, glabrous. Flowers erect to ascending at anthesis; sepals glabrous; petals white to dark lavender, 4–8 ´ 1.0–2.5 mm, glabrous; ovules 10–20 per fruit. Fruits 2.5–6.5 cm ´ 3–7 mm, suberect to ascending, usually not appressed to rachises, not secund, straight to curved, often with somewhat undulate (non-parallel) edges, glabrous; style 0.05–0.30 mm. Seeds uniseriate, 3–6 ´ 2–4 mm; wing continuous, 1.3–2.5 mm wide.

Flowering: Jun–Aug.

Habitat: rock outcrops, talus slopes and gravelly soil in alpine and subalpine habitats.

Elevation: 1800–3800 m.

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

Reproductive mode: apomictic triploid.




© 2018 Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110