Difference between revisions of "Draba streptobrachia"
Brittonia 32: 168. 1980.
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|year=1980 | |year=1980 | ||
}} | }} | ||
− | |basionyms={{Treatment/ID/ | + | |special_status={{Treatment/ID/Special_status |
+ | |code=E | ||
+ | |label=Endemic | ||
+ | }} | ||
+ | |basionyms={{Treatment/ID/Basionym | ||
|name=Draba chrysantha | |name=Draba chrysantha | ||
|authority=S. Watson forma dasycarpa O. E. Schulz | |authority=S. Watson forma dasycarpa O. E. Schulz | ||
+ | |rank=species | ||
+ | |publication_title=in H. G. A. Engler, Pflanzenr. | ||
+ | |publication_place=89[IV,105]: 195. 1927, | ||
}} | }} | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Draba spectabilis var. dasycarpa | |name=Draba spectabilis var. dasycarpa | ||
|authority=(O. E. Schulz) C. L. Hitchcock | |authority=(O. E. Schulz) C. L. Hitchcock | ||
+ | |rank=variety | ||
}} | }} | ||
|hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba streptobrachia | |hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba streptobrachia | ||
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|elevation=3200-4000 m | |elevation=3200-4000 m | ||
|distribution=Colo. | |distribution=Colo. | ||
− | |discussion=<p>As indicated by Price, Draba streptobrachia is an apomict, yielding abundant, well-developed seed despite producing only abortive pollen. Morphological studies (M. D. Windham, unpubl.) suggest that the species may be an allopolyploid containing a genome from D. crassa.</p> | + | |discussion=<p>As indicated by Price, <i>Draba streptobrachia</i> is an apomict, yielding abundant, well-developed seed despite producing only abortive pollen. Morphological studies (M. D. Windham, unpubl.) suggest that the species may be an allopolyploid containing a genome from <i>D. crassa</i>.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Draba streptobrachia | name=Draba streptobrachia | ||
− | |||
|authority=R. A. Price | |authority=R. A. Price | ||
|rank=species | |rank=species | ||
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|publication title=Brittonia | |publication title=Brittonia | ||
|publication year=1980 | |publication year=1980 | ||
− | |special status= | + | |special status=Endemic |
− | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V7/V7_476.xml |
|tribe=Brassicaceae tribe Arabideae | |tribe=Brassicaceae tribe Arabideae | ||
|genus=Draba | |genus=Draba |
Latest revision as of 23:33, 5 November 2020
Perennials; caudex branched (often with persistent leaf remains, branches not creeping); not scapose. Stems unbranched, (0.1–)0.2–1(–1.3) dm, pubescent throughout, trichomes subsessile (often crisped), 3–5-rayed, stellate, 0.03–0.25(–0.4) mm, (rays sometimes forked). Basal leaves rosulate; petiole (obscure), usually not ciliate, rarely sparsely pubescent, (trichomes simple, to 0.6 mm); blade oblanceolate to linear-oblanceolate, (0.4–)0.5–3(–4) cm × 1–5 mm, margins entire, surfaces pubescent with short-stalked (crisped), 3–8-rayed trichomes, 0.05–0.4 mm. Cauline leaves (1 or) 2–4 (or 5); sessile; blade oblong to ovate or linear, margins entire, surfaces pubescent as basal. Racemes 4–10(–18)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels ascending, usually straight, rarely curved upward, (2–)3–8(–12) mm, pubescent as stem. Flowers: sepals ovate, 2–3 mm, pubescent, (trichomes simple and short-stalked, 2–4-rayed); petals yellow, spatulate, 3–5 × 1.5–3 mm, (clawed); anthers ovate, 0.25–0.4 mm. Fruits (not appressed to rachis), ovate to elliptic or lanceolate, slightly twisted or plane, flattened, (3–)5–10 × 2–4 mm; valves often pubescent, occasionally glabrous, trichomes simple and minutely stalked, 2–4-rayed, 0.03–0.25 mm; ovules 10–16(–18) per ovary; style 0.3–0.8(–1.2) mm. Seeds oblong, 1–1.6 × 0.6–1 mm. 2n = ca. 64.
Phenology: Flowering Jul–Aug.
Habitat: Alpine tundra, scree, ridges and alpine slopes, turf, fellfields, talus slopes, crevices in rock ledges, loose soils
Elevation: 3200-4000 m
Discussion
As indicated by Price, Draba streptobrachia is an apomict, yielding abundant, well-developed seed despite producing only abortive pollen. Morphological studies (M. D. Windham, unpubl.) suggest that the species may be an allopolyploid containing a genome from D. crassa.
Selected References
None.