Difference between revisions of "Draba cusickii"
in H. G. A. Engler, Pflanzenr. 89[IV,105]: 105. 1927.
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|elevation=2000-2700 m | |elevation=2000-2700 m | ||
|distribution=Oreg. | |distribution=Oreg. | ||
| − | |discussion=<p>Draba cusickii was divided by R. C. Rollins (1993) into two varieties with significantly different morphologies and chromosome numbers. The Nevada endemic var. pedicellata (2n = 20) is here treated as a distinct species following M. D. Windham (2004). Draba cusickii has the same chromosome number as D. sobolifera but is readily distinguished from that species by having 4-rayed (versus simple or 2-rayed) fruit trichomes. Draba cusickii is known from Steens Mountain (Harney County).</p> | + | |discussion=<p><i>Draba cusickii</i> was divided by R. C. Rollins (1993) into two varieties with significantly different morphologies and chromosome numbers. The <i>Nevada</i> endemic var. pedicellata (2n = 20) is here treated as a distinct species following M. D. Windham (2004). <i>Draba cusickii</i> has the same chromosome number as <i>D. sobolifera</i> but is readily distinguished from that species by having 4-rayed (versus simple or 2-rayed) fruit trichomes. <i>Draba cusickii</i> is known from Steens Mountain (Harney County).</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1927 | |publication year=1927 | ||
|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_398.xml |
|tribe=Brassicaceae tribe Arabideae | |tribe=Brassicaceae tribe Arabideae | ||
|genus=Draba | |genus=Draba | ||
Revision as of 17:57, 18 September 2019
Perennials; (loosely cespitose); caudex branched (with few, persistent leaf remains); scapose. Stems unbranched, 0.3–1.2 dm, pubescent throughout, trichomes (2–)4-rayed, 0.05–0.5(–0.6) mm. Basal leaves rosulate; shortly petiolate; petiole base ciliate (margin not ciliate, trichomes 2-rayed, 0.3–0.6 mm); blade oblanceolate to obovate, 0.4–1.2 cm × 2–5 mm, margins entire or, rarely, denticulate, surfaces pubescent with stalked, (2–)4-rayed trichomes, 0.15–0.4 mm. Cauline leaves 0. Racemes 10–20(–25)-flowered, ebracteate, considerably elongated in fruit; rachis not flexuous, pubescent as stems proximally. Fruiting pedicels divaricate-ascending, straight (not expanded basally), 4–9 mm, pubescent, trichomes (2–)4-rayed, (0.05–0.25 mm). Flowers: sepals broadly ovate, 2–2.5 mm, pubescent, (trichomes short-stalked, 3- or 4-rayed); petals yellow, obovate to oblanceolate, 3.7–6 × 1.5–2.5 mm; anthers ovate, 0.5–0.6 mm. Fruits lanceolate to broadly ovate, plane, flattened, 6–9 × 2–4.5 mm; valves pubescent, trichomes short-stalked, (2–)4-rayed, 0.05–0.25 mm; ovules 10–18 per ovary; style 0.4 0.8(–1) mm. Seeds oblong, 1.2–1.5 × 0.7–0.8 mm. 2n = 26.
Phenology: Flowering Jun–Jul.
Habitat: Basaltic outcrops, talus, rocky soil
Elevation: 2000-2700 m
Discussion
Draba cusickii was divided by R. C. Rollins (1993) into two varieties with significantly different morphologies and chromosome numbers. The Nevada endemic var. pedicellata (2n = 20) is here treated as a distinct species following M. D. Windham (2004). Draba cusickii has the same chromosome number as D. sobolifera but is readily distinguished from that species by having 4-rayed (versus simple or 2-rayed) fruit trichomes. Draba cusickii is known from Steens Mountain (Harney County).
Selected References
None.