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Boechera johnstonii (Munz) 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: Novon 13(4): 386. 2003. (Novon) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

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

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49. Boechera johnstonii (Munz) Al-Shehbaz, Novon 13: 386. 2003; Arabis johnstonii Munz, Bull. S. Calif. Acad. Sci. 31: 63. 1932. TYPE: United States, California: Riverside County, San Jacinto Mts., Kenworthy, Thomas Valley, dry rocky slopes, 4500 ft, 19 May 1922, P. A. Munz & I. M. Johnston 5485 (holotype, POM !; isotypes, CAS !, GH !).

Arabis hirshbergiae S. Boyd, Aliso 17: 203. 1998; Boechera hirshbergiae (S. Boyd) Al-Shehbaz, Novon 13: 386. 2003. TYPE: United States, California, San Diego County, Cuyamaca Mts., east of Cuyamaca Reservoir along Sunrise Highway (S-1), 0.5 miles southeast of junction with Hwy 79, about 50 feet north of the road near the Pedro Fages Trail Marker, ca. 33°00'N, 116°30'W, 1400 m, 19 Mar 1995, J. Hirshberg s.n. (holotype, RSA !; Isotype, GH !).

     Plants long-lived, cespitose perennials, with woody caudices, lacking crowded, persistent leaf bases; sexual, with ellipsoid pollen. Stems usually 1 per caudex branch, arising near ground surface from center of basal rosettes, 0.5–2 dm, lower parts with abundant short-stalked, 4–10-rayed trichomes 0.07–0.15 mm, upper parts sparsely to densely pubescent. Leaves at stem bases narrowly oblanceolate, 1.5–4.0 mm wide, entire, not ciliate, blade surfaces densely pubescent with short-stalked, 6–14-rayed trichomes 0.07–0.15 mm; cauline leaves 4–10, often concealing stem proximally, the uppermost densely pubescent, lacking auricles. Inflorescences unbranched, 10–18-flowered; fruiting pedicels 5–14 mm, divaricate-ascending, straight, with appressed, branched trichomes. Flowers ascending at anthesis; sepals pubescent; petals purple, 9–14 ´ 2–4 mm, glabrous; ovules 26–34 per fruit. Fruits 4–6 cm ´ 2.5–4.0 mm, divaricate-ascending, not appressed to rachises, not secund, straight, with parallel edges, glabrous; style (0.7–)1.0–2.0 mm. Seeds uniseriate, 1.9–2.7 ´ 1.5–2.2 mm; wing continuous, 0.3–0.7 mm wide.

Flowering: Feb–Mar.

Habitat: rocky areas and gravelly soil in chaparral and oak-pine savanna.

Elevation: 1300–1700 m.

Distribution: United States (California/ San Diego and Riverside counties).

Reproductive mode: sexual diploid.

 

 
 
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