Draba oblongata

R. Brown ex de Candolle

Syst. Nat. 2: 342. 1821.

Synonyms: Draba arctica subsp. groenlandica (E. Ekman) Böcher Draba cinerea subsp. groenlandica (E. Ekman) Böcher Draba groenlandica E. Ekman
Treatment appears in FNA Volume 7. Treatment on page 323. Mentioned on page 274, 285, 292, 324.

Perennials; (cespitose); caudex branched (with persistent leaf remains); sometimes scapose. Stems unbranched, (0.2–) 0.4–1.5 (–1.9) dm, pubescent throughout, trichomes simple, 0.4–0.8 mm, and short-stalked, 4–10-rayed, 0.05–0.3 mm, (mostly branched distally). Basal leaves rosulate; petiolate; petiole base and margin ciliate, (trichomes simple, 0.3–1 mm); blade oblanceolate to lanceolate, 0.4–1.5 cm × 1.5–5 mm, margins entire, surfaces pubescent with simple and stalked, 2-rayed or 3-rayed trichomes, 0.4–1 mm, with short-stalked, 8–12-rayed, stellate ones, 0.1–0.2 mm. Cauline leaves 0–2; sessile; blade oblong to broadly ovate, margins entire, surfaces pubescent as basal. Racemes 5–13 (–18) -flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem distally. Fruiting pedicels divaricate to ascending, straight, 2–6 (–8) mm, pubescent as rachis. Flowers: sepals ovate, 2–3 mm, pubescent, (trichomes simple and short-stalked, mostly 2-rayed); petals white, spatulate to obovate, 3.5–5 × 1.5–2.5 mm; anthers ovate, 0.2–0.3 mm. Fruits elliptic to oblong, plane, slightly flattened, 4–8 (–9.5) × 2–3 (–4) mm; valves pubescent, trichomes short-stalked, (2–) 5–12-rayed, 0.05–3 mm; ovules 24–36 per ovary; style 0.2–0.8 mm (stigma considerably wider than style, often appearing 2-lobed). Seeds ovate, 0.7–1 × 0.5–0.6 mm. 2n = 64.


Phenology: Flowering Jun–Jul.
Habitat: Ridges and hillsides, sand and gravel flood plains, swales, tundra
Elevation: 0-400 m

Distribution

V7 437-distribution-map.gif

Greenland, N.W.T., Nunavut, Alaska, e Asia (Russian Far East), e Asia (Siberia)

Discussion

Plants of Draba oblongata are occasionally misidentified as decaploid (2n = 80) D. arctica, but the former is readily separated by a preponderance of simple (versus stellate) trichomes on both leaf blade surfaces. Draba oblongata is sometimes confused with D. micropetala, but the latter has pale yellow (versus white) flowers, fruits pubescent with simple and spurred (versus (2–)5–12-rayed) trichomes, and stigmas as wide as (versus much wider than) the style.

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

... more about "Draba oblongata"
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
R. Brown ex de Candolle +
appendaged +  and unappendaged +
not +  and auriculate +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
lobed +, toothed +  and entire +
oblong;broadly ovate +
much smaller +  and reduced +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
urceolate +, campanulate +  and tubular +
scapose +  and branched +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Greenland +, N.W.T. +, Nunavut +, Alaska +, e Asia (Russian Far East) +  and e Asia (Siberia) +
0-400 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 +
0.8 cm8 mm <br />0.008 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
indehiscent +  and dehiscent +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
flattened +, plane +, elliptic +  and oblong +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Ridges and hillsides, sand and gravel flood plains, swales, tundra +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
short-stalked +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
3.5mm;5mm +
rudimentary +
spatulate +  and obovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Jun–Jul. +
trinucleate +  and 3(-11)-colpate +
ebracteate;5-13(-18)-flowered +
ascending +  and erect +
slender +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
straight +  and not flexuous +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 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 +
persistent +
distinct +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Draba arctica subsp. groenlandica +, Draba cinerea subsp. groenlandica +  and Draba groenlandica +
Draba oblongata +
species +
short-stalked +  and simple +
cruciform +  and forked +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
coiled +, 1-7-veined +  and veined +
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 +