Difference between revisions of "Boechera davidsonii"
in A. Cronquist et al., Intermount. Fl. 2(B): 368. 2005.
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|name=Arabis bruceae | |name=Arabis bruceae | ||
|authority=M. E. Jones | |authority=M. E. Jones | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Arabis cognata | |name=Arabis cognata | ||
|authority=Jepson | |authority=Jepson | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Arabis davidsonii var. parva | |name=Arabis davidsonii var. parva | ||
|authority=Rollins | |authority=Rollins | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Arabis lyallii var. davidsonii | |name=Arabis lyallii var. davidsonii | ||
|authority=(Greene) Smiley | |authority=(Greene) Smiley | ||
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|elevation=1200-3400 m | |elevation=1200-3400 m | ||
|distribution=Calif.;Nev.;Oreg. | |distribution=Calif.;Nev.;Oreg. | ||
| − | |discussion=<p>Plants of Boechera davidsonii sometimes are confused with completely glabrous individuals of B. lyallii, and G. A. Mulligan (1996) treated it as a synonym of the latter. It is easily distinguished from B. lyallii by the thick covering of persistent leaf bases on caudex branches, ascending (versus erect and appressed) fruits, and uniseriate (versus biseriate to sub-biseriate) seeds. Boechera davidsonii is nearly unique among western North American species of the genus in showing no evidence of hybridization with other species.</p> | + | |discussion=<p>Plants of <i>Boechera davidsonii</i> sometimes are confused with completely glabrous individuals of <i>B. lyallii</i>, and G. A. Mulligan (1996) treated it as a synonym of the latter. It is easily distinguished from <i>B. lyallii</i> by the thick covering of persistent leaf bases on caudex branches, ascending (versus erect and appressed) fruits, and uniseriate (versus biseriate to sub-biseriate) seeds. <i>Boechera davidsonii</i> is nearly unique among western North American species of the genus in showing no evidence of hybridization with other species.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=2005 | |publication year=2005 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V7/V7_511.xml |
|tribe=Brassicaceae tribe Boechereae | |tribe=Brassicaceae tribe Boechereae | ||
|genus=Boechera | |genus=Boechera | ||
Revision as of 17:58, 18 September 2019
Perennials; long-lived; (cespitose); sexual; caudex woody (thickly covered by persistent, crowded leaf bases). Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 0.6–2.3 dm, glabrous throughout. Basal leaves: blade oblanceolate, 3.5–14 mm wide, margins usually entire, rarely slightly dentate, not ciliate, surfaces glabrous. Cauline leaves: 3–10, not concealing stem; blade auricles absent, glabrous. Racemes 4–24-flowered, usually unbranched. Fruiting pedicels ascending, straight, 3–18 mm, glabrous. Flowers ascending at anthesis; sepals glabrous; petals white to lavender, 6–10 × 2.5–4 mm, glabrous; pollen ellipsoid. Fruits ascending to divaricate-ascending, not appressed to rachis, not secund, straight to slightly curved, edges parallel, 2.5–7 cm × 1.5–2.5 mm; valves glabrous; ovules 28–50 per ovary; style 0.1–0.8 mm. Seeds uniseriate, 1.8–2.2 × 0.8–1.7 mm; wing distal or continuous, 0.1–0.5 mm wide.
Phenology: Flowering Apr–Jul.
Habitat: Ledges and crevices of rock outcrops
Elevation: 1200-3400 m
Distribution
Calif., Nev., Oreg.
Discussion
Plants of Boechera davidsonii sometimes are confused with completely glabrous individuals of B. lyallii, and G. A. Mulligan (1996) treated it as a synonym of the latter. It is easily distinguished from B. lyallii by the thick covering of persistent leaf bases on caudex branches, ascending (versus erect and appressed) fruits, and uniseriate (versus biseriate to sub-biseriate) seeds. Boechera davidsonii is nearly unique among western North American species of the genus in showing no evidence of hybridization with other species.
Selected References
None.