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Boechera elkoensis
ELKO ROCKCRESS

Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key

Common Name: MUSTARD FAMILY
Habit: Annual to shrub; sap pungent, watery. Leaf: generally simple, alternate; generally both basal, cauline; stipules 0. Inflorescence: generally raceme, generally not bracted. Flower: bisexual, generally radial; sepals 4, generally free; petals (0)4, forming a cross, generally white or yellow to purple; stamens generally 6 (2 or 4), 4 long, 2 short (3 pairs of unequal length); ovary 1, superior, generally 2-chambered with septum connecting 2 parietal placentas; style 1, stigma entire or 2-lobed. Fruit: capsule, generally 2-valved, "silique" (length >= 3 × width) or "silicle" (length < 3 × width), dehiscent by 2 valves or indehiscent, cylindric or flat parallel or perpendicular to septum, segmented or not. Seed: 1--many, in 1 or 2 rows per chamber, winged or wingless; embryo strongly curved.
Genera In Family: +- 330 genera, 3780 species: worldwide, especially temperate. Note: Highest diversity in Mediterranean area, mountains of southwestern Asia, adjacent central Asia, western North America; some Brassica species are oil or vegetable crops; Arabidopsis thaliana used in experimental molecular biology; many species are ornamentals, weeds. Aurinia saxatilis (L.) Desvaux in cultivation only. Aubrieta occasional waif in central NCoR, Carrichtera annua (L.) DC. in SCo, Iberis sempervirens L., Iberis umbellata L. in PR, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern NCoRO, CCo. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella.
eFlora Treatment Author: Ihsan A. Al-Shehbaz, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: BoecheraView DescriptionDichotomous Key

Common Name: ROCKCRESS
Habit: Perennial herb (biennial); caudex simple or branched, persistent leaf bases generally absent; rosetted or not; rosette at ground surface or elevated on woody base; hairs simple or 2--14-rayed, stalked or sessile. Stem: simple or branched, leafy. Leaf: basal petioled, simple, generally entire or dentate, generally hairy; cauline sessile, base generally lobed, entire or dentate. Inflorescence: generally elongated. Flower: sepals bases generally not sac-like; petals generally white, lavender, or purple, claw present or 0; pollen ellipsoid in sexual pls, spheric in plants with asexual seeds. Fruit: silique, dehiscent, generally linear, edges generally parallel, unsegmented, flat parallel to septum; stigma entire or 2-lobed. Seed: in 1 or 2 rows, winged or not.
Species In Genus: 110+ species: temperate North America, Russian Far East. Etymology: (T.W. Boecher, Danish cytogeneticist, 1909--1983) Note: Some species with both fertile & sterile stems. Previously included in Arabis, but the 2 genera in different tribes. Boechera horizontalis (Greene) Windham & Al-Shehbaz [Arabis suffrutescens S. Watson var. horizontalis (Greene) Rollins] not in California.
Unabridged Note: Hybrids with spheric pollen and morphological intermediacy generally more common than sexual diploids (with ellipsoid pollen).
eFlora Treatment Author: Michael D. Windham & Ihsan A. Al-Shehbaz

Boechera elkoensis Windham & Al-Shehbaz
NATIVE
Habit: Caudex +- woody. Stem: 1--5 per caudex branch, from margin or center of basal rosette at +- ground surface; 1--3 dm, proximally with +- sessile, 2--5-rayed hairs 0.1--0.4 mm. Leaf: basal 2--6 mm wide, entire, hairs +- sessile, 2--5-rayed, 0.1--0.4 mm; cauline 3--6, distal glabrous or sparsely ciliate, basal lobes 0.2--0.5 mm (0). Inflorescence: 4--11-flowered, not 1-sided in fruit; fruit pedicel erect to ascending, straight, 4--8 mm, glabrous or hairs few, appressed, branched. Flower: sepals glabrous; petals 4--7 mm, 1.2--2 mm wide, lavender (+- white); pollen spheric. Fruit: erect to ascending, generally appressed, 3--7 cm, 2--3 mm wide, glabrous, edges generally +- wavy (non-parallel); style < 0.3 mm; ovules 26--42. Seed: in 1 row, 2.5--3.5 mm; wing 0.4--0.9 mm wide.
Ecology: Gravelly-rocky soil in open forest, subalpine meadows; Elevation: 2050--3150 m. Bioregional Distribution: n&c SNH, n SNE; Distribution Outside California: Nevada. Flowering Time: Jul
Synonyms: Arabis platysperma A Gray var. platysperma, in part
eFlora Treatment Author: Michael D. Windham & Ihsan A. Al-Shehbaz
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Citation for this treatment: Michael D. Windham & Ihsan A. Al-Shehbaz 2016. Boechera elkoensis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=85472, accessed on September 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on September 29, 2016.


Boechera elkoensis
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© 2008 Steve Matson
Boechera elkoensis
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© 2009 Thomas Stoughton
Boechera elkoensis
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© 2004 Robert E. Preston, Ph.D.
Boechera elkoensis
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© 2015 Barry Breckling
Boechera elkoensis
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© 2009 Thomas Stoughton
Boechera elkoensis
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© 2009 Thomas Stoughton

More photos of Boechera elkoensis in CalPhotos


Geographic subdivisions for Boechera elkoensis:
n&c SNH, n SNE;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.