Draba spectabilis

Greene

Pittonia 4: 19. 1899.

Synonyms: Draba oxyloba Greene Draba spectabilis var. bella O. E. Schulz Draba spectabilis var. oxyloba (Greene) Gilg & O. E. Schulz Draba spectabilis var. purpusii Gilg & O. E. Schulz
Treatment appears in FNA Volume 7. Treatment on page 339. Mentioned on page 276, 278, 288, 319, 337.

Perennials; caudex simple or branched (sometimes with persistent leaf-bases); not scapose. Stems unbranched, (0.7–) 1.1–3.7 (–5.3) dm, pubescent throughout (sparsely so distally), trichomes simple, malpighiaceous, or sessile and 4-rayed, 0.15–0.5 mm, (2 rays parallel to stem axis longer). Basal leaves rosulate; petiolate; petiole sometimes ciliate, (trichomes simple); blade oblanceolate to spatulate or obovate, (1–) 1.5–4.4 (–6.3) cm × (3–) 5–12 (–15) mm, margins entire or dentate, surfaces pubescent with sessile, often 4-rayed trichomes, 0.1–0.6 mm (longest rays parallel to midvein, lateral rays sometimes reduced to tiny spurs), sometimes malpighiaceous trichomes present. Cauline leaves 4–12 (–17); sessile; blade broadly ovate to lanceolate or oblong, margins entire or dentate, (ciliate or not), surfaces pubescent as basal or adaxially also with simple trichomes. Racemes (10–) 16–49 (–61) -flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels horizontal to divaricate-ascending, straight or curved upward, (5–) 7–20 (–26) mm, glabrous or pubescent as rachis abaxially. Flowers: sepals ovate, (2.2–) 2.5–4 mm, glabrous or pubescent, (trichomes simple and malpighiaceous); petals yellow, oblanceolate, 4–6.5 × 1–2.5 mm; anthers oblong, 0.5–0.7 mm. Fruits lanceolate to oblong or elliptic, plane, flattened, (6–) 7–13 × 2–3.5 mm; valves glabrous or puberulent, trichomes simple and sessile, 2-rayed, 0.03–0.3 mm; ovules 12–24 per ovary; style (0.5–) 1–2.7 mm. Seeds ovoid, 1–1.4 × 0.7–0.9 mm. 2n = 40.


Phenology: Flowering Jun–Aug.
Habitat: Talus, rocky hillsides, meadows in open conifer forests, aspen groves, and alpine communities
Elevation: 2000-3900 m

Discussion

Morphological and chromosomal data suggest that Draba spectabilis is an allopolyploid resulting from hybridization between D. abajoensis and D. malpighiacea. The characteristics distinguishing these three taxa were discussed in detail by I. A. Al-Shehbaz and M. D. Windham (2007). Chromosome counts attributed to D. spectabilis by Windham (2000) represent diploid D. abajoensis.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Draba spectabilis"
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Greene +
appendaged +  and unappendaged +
4.4 cm44 mm <br />0.044 m <br /> (6.3 cm63 mm <br />0.063 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (4.4 cm44 mm <br />0.044 m <br />) +
lobed +, toothed +  and entire +
broadly ovate;lanceolate or oblong +
much smaller +  and reduced +
5mm;12mm +
urceolate +, campanulate +  and tubular +
not scapose +, branched +  and simple +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Colo. +, N.Mex. +  and Wyo. +
2000-3900 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
not basally +  and dilated +
actinomorphic +
orange;purple;orange;purple;pink;white;yellow +
spreading +, ascending +  and erect +
Linear (?) +, Oblanceolate (?) +, Spatulate (?) +, Obovate (?) +, Subsaccate (?) +, Not saccate (?) +, Oblong (?) +  and Ovate (?) +
latiseptate +, twisted +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
indehiscent +  and dehiscent +
7mm;13mm +
flattened +, plane +, lanceolate +  and oblong or elliptic +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Talus, rocky hillsides, meadows in open conifer forests, aspen groves, and alpine communities +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
dentate +  and entire +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
rudimentary +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Jun–Aug. +
trinucleate +  and 3(-11)-colpate +
ebracteate;(10-)16-49(-61)-flowered +
elongated +
ascending +  and erect +
slender +
2 cm20 mm <br />0.02 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
curved +, straight +  and not flexuous +
horizontal +  and divaricate-ascending +
pubescent +  and glabrous +
mucilaginous +
not +  and mucilaginous +
White (?) +, Black (?) +, Brown (?) +  and Yellow (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
pubescent +  and glabrous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
reduced +
latiseptate +, twisted +  and sessile +
indehiscent +  and dehiscent +
terete +, plane +, subglobose +, ovoid +, suborbicular +, linear +, oblong +, elliptic +, lanceolate +  and ovate +
latiseptate +, twisted +  and sessile +
indehiscent +  and dehiscent +
terete +, plane +, subglobose +, ovoid +, suborbicular +, linear +, oblong +, elliptic +, lanceolate +  and ovate +
tetradynamous +
procumbent +  and decumbent +
prostrate +  and decumbent +
usually erect +  and ascending +
subsessile +, sessile +  and petiolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Draba oxyloba +, Draba spectabilis var. bella +, Draba spectabilis var. oxyloba +  and Draba spectabilis var. purpusii +
Draba spectabilis +
species +
sessile +, simple +  and malpighiaceous +
cruciform +  and forked +
0.003 cm0.03 mm <br />3.0e-5 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
puberulent +  and glabrous +
anastomosing +
scapose +  and not +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +