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Published In: Botaniska Notiser 128(4): 513. 1975[1976]. (6 May 1976) (Bot. Not.) Name publication detail
 

Project Name Data (Last Modified On 8/26/2009)
Acceptance : Accepted
 

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9. Boechera Á. Löve & D. Löve

Plants biennial or perennial herbs (sometimes woody at the base elsewhere), terrestrial. Stems erect, ascending or rarely spreading, usually branched. Leaves alternate and basal, the basal ones often forming rosettes, sometimes absent at flowering time, variously shaped and divided, the bases of the stem leaves clasping or not, rarely petiolate, often pubescent with unbranched or forked hairs (with stalked, more or less stellate hairs elsewhere), rarely glabrous or with unbranched hairs only. Inflorescences racemes or panicles, the flowers not subtended by bracts. Sepals erect or ascending. Petals not lobed; white, pink, or purple. Styles absent or 0.5–2.0 mm long (rarely longer elsewhere). Stigma entire. Fruits more than 10 times as long as wide, slightly to strongly flattened parallel to the septum, dehiscing longitudinally by the valves breaking off without coiling, each valve usually with a midnerve extending the full length or rarely only near the base. Seeds in 1 or 2 rows in each locule, winged or rarely wingless. About 65 species, North America.

Extensive molecular and cytological studies (summarized in Al-Shehbaz, 2003) strongly support the recognition of Boechera as a genus not closely related to Arabis. All species of Arabis have chromosome numbers based on x=8, whereas all species of Boechera have x=7. The morphological differences between the two genera are discussed in that paper.

 

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1 Leaves not clasping the stem, narrowed at the base; stalks of the fruits reflexed or arched downward; fruits 2.54.0 mm wide ... 1. B. CANADENSIS 1 Boechera canadensis
+ Some or all of the leaves clasping the stem, with auricles at the base; stalks of the fruits erect to spreading; fruits 0.72.0(2.5) mm wide 4 Boechera shortii
 
 
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