Draba pedicellata

(Rollins & R. A. Price) Windham

Madroño 50: 221. 2004.

Basionym: Draba cusickii var. pedicellata Rollins & R. A. Price Harvard Pap. Bot. 1(3): 73. 1991
Synonyms: Draba pedicellata var. wheelerensis N. H. Holmgren
Treatment appears in FNA Volume 7. Treatment on page 328. Mentioned on page 282, 284, 329, 340.

Perennials; (loosely cespitose); caudex branched (with persistent leaf-bases, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.15–) 0.3–1.3 (–1.6) dm, pubescent proximally, glabrous or nearly so distally, trichomes 2-rayed or 3-rayed and simple, 0.1–1 mm. Basal leaves rosulate; subsessile; blade oblanceolate to obovate, 0.4–1.6 (–2) cm × 2–4 (–6) mm, margins entire, (not ciliate), surfaces pubescent with stalked, 2–4-rayed trichomes, 0.2–0.9 mm, rarely adaxially with simple trichomes, (midvein obscure abaxially). Cauline leaves 0. Racemes 3–20 (–27) -flowered, ebracteate, slightly to considerably elongated in fruit; rachis straight or flexuous, usually glabrous, rarely pubescent, trichomes simple and 2–4-rayed. Fruiting pedicels divaricate to horizontal, straight or curved upward (expanded basally or not), 4–9 (–13) mm, glabrous or pubescent, trichomes simple and 2–4-rayed. Flowers: sepals broadly ovate, 1.8–2.5 mm, glabrous or pubescent, (trichomes simple and branched); petals yellow, spatulate, 3.5–5.5 × 1.5–2.2 mm; anthers ovate, 0.4–0.5 mm. Fruits lanceolate to ellipsoid or ovoid, plane (not curved), inflated or slightly flattened, (4.2–) 5.3–10 (–13) × 2.5–4.5 (–5.5) mm; valves glabrous or pubescent, trichomes simple and short-stalked, 2-rayed, 0.05–0.3 mm; ovules 8–16 per ovary; style 0.3–1 (–1.2) mm. Seeds oblong, 1.2–1.6 × 0.7–0.9 mm. 2n = 20.


Phenology: Flowering May–Jul.
Habitat: Rock outcrops, talus, steep gravel slopes in pinyon-juniper, mixed conifer, and subalpine meadow communities
Elevation: 2300-3800 m

Discussion

Draba pedicellata is known from Elko, Eureka, Nye, and White Pine counties in northeastern Nevada and to Tooele County in northwestern Utah. It was considered a variety of D. cusickii by R. C. Rollins (1993); chromosome number, morphology, and geographic distribution suggest a closer relationship to D. sphaeroides. For a detailed discussion and comparison of these species, consult M. D. Windham (2004). N. H. Holmgren (2005b) divided D. pedicellata into two varieties: var. pedicellata, which is found on limestone throughout the species range, and var. wheelerensis, which is found on non-calcareous substrates in White Pine County. Although var. wheelerensis has slightly more spreading pedicels on somewhat more flexuous rachises, it appears to be little more than a dwarf alpine form of the species.

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 pedicellata"
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
(Rollins & R. A. Price) Windham +
Draba cusickii var. pedicellata +
appendaged +  and unappendaged +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
not +  and auriculate +
0.4 cm4 mm <br />0.004 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
lobed +, toothed +  and entire +
oblanceolate;obovate +
much smaller +  and reduced +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
urceolate +, campanulate +  and tubular +
scapose +  and branched +
sessile +  and petiolate +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Nev. +  and Utah. +
2300-3800 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 +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
indehiscent +  and dehiscent +
0.53 cm5.3 mm <br />0.0053 m <br /> (1 cm10 mm <br />0.01 m <br />) +
lanceolate +  and ellipsoid or ovoid plane inflated or slightly flattened +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Rock outcrops, talus, steep gravel slopes in pinyon-juniper, mixed conifer, and subalpine meadow communities +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
3.5mm;5.5mm +
rudimentary +
spatulate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
Flowering May–Jul. +
trinucleate +  and 3(-11)-colpate +
ebracteate;3-20(-27)-flowered +
ascending +  and erect +
slender +
flexuous +  and straight +
pubescent +  and glabrous +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
pubescent +  and glabrous +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.25 cm2.5 mm <br />0.0025 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 +
nearly +, glabrous +  and pubescent +
subsessile +, sessile +  and petiolate +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
persistent +
distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Draba pedicellata var. wheelerensis +
Draba pedicellata +
species +
short-stalked +, simple +  and stalked +
cruciform +  and forked +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
pubescent +  and glabrous +
anastomosing +
scapose +  and not +
0.9 cm9 mm <br />0.009 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
curved +  and straight +
pubescent +  and glabrous +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +