Draba paysonii

J. F. Macbride

Contr. Gray Herb. 56: 52. 1918.

Endemic
Basionym: Draba vestita Payson Amer. J. Bot. 4: 261. [May] 1917,
Treatment appears in FNA Volume 7. Treatment on page 327. Mentioned on page 286, 287, 306, 312, 323, 328.

Perennials; (cespitose, densely pulvinate); caudex branched (covered with persistent leaves, branches creeping, sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.05–0.3 dm, densely pubescent throughout, trichomes simple, 0.4–1.3 mm, and stalked, 2–5-rayed, stellate, 0.1–0.6 mm. Basal leaves (imbricate); rosulate; sessile; blade linear to linear-oblanceolate, 0.4–1.2 cm × 0.8–1.5 mm, margins entire, (ciliate, trichomes simple and spurred, (0.4–) 0.6–1.4 mm), surfaces pubescent, abaxially (dense) with stalked, 2–12-rayed trichomes, 0.1–0.8 mm, adaxially with simple and 2-rayed ones, 0.3–1 mm, (midvein prominent). Cauline leaves 0. Racemes 2–7-flowered, ebracteate, slightly elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels divaricate-ascending, straight, 3–9 mm, pubescent, trichomes simple (0.4–1.4 mm), and stalked, 2–5-rayed (0.1–0.6 mm). Flowers: sepals oblong, 2.8–3.5 mm, pubescent, (trichomes simple and short-stalked, 2–4-rayed); petals pale-yellow, oblanceolate to spatulate, (4–) 5–6 × (1.5–) 2–3 mm; anthers oblong, 0.5–0.7 mm. Fruits often broadly ovoid to lanceolate, plane, slightly inflated basally, (5–) 6–9 × (3–) 3.7–5 mm; valves densely pubescent, trichomes simple and 2-rayed, (0.2–) 0.4–1 mm, (occasionally with fewer, smaller, 4-rayed or 5-rayed ones); ovules 8–12 per ovary; style (0.6–) 0.8–1.2 mm. Seeds oblong, 1.7–2.2 × 1–1.4 mm.


Phenology: Flowering Jun–Jul.
Habitat: Limestone rock outcrops, talus, gravelly calcareous soil
Elevation: 1800-3500 m

Discussion

Draba paysonii is known from southwestern Montana (Gallatin, Glacier, Madison, and Meagher counties) and northwestern Wyoming (Fremont and Park counties). Reports of its occurrence in Alberta (e.g., G. A. Mulligan 1971b) are based on plants of D. novolympica, a species formerly treated as D. paysonii var. treleasei. Features distinguishing these two species are discussed under 70. D. novolympica.

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 paysonii"
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 +
J. F. Macbride +
Draba vestita +
appendaged +  and unappendaged +
not +  and auriculate +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
lobed +, toothed +  and entire +
linear;linear-oblanceolate +
much smaller +  and reduced +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
urceolate +, campanulate +  and tubular +
scapose +  and branched +
sessile +  and petiolate +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Mont. +  and Wyo. +
1800-3500 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 +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
indehiscent +  and dehiscent +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
inflated +, plane +, often broadly ovoid +  and lanceolate +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Limestone rock outcrops, talus, gravelly calcareous soil +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pale-yellow +
rudimentary +
oblanceolate +  and spatulate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Jun–Jul. +
trinucleate +  and 3(-11)-colpate +
Contr. Gray Herb. +
ebracteate;2-7-flowered +
ascending +  and erect +
slender +
not flexuous +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.35 cm3.5 mm <br />0.0035 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 +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
persistent +
distinct +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Abdra +, Erophila +, Nesodraba +  and Tomostima +
Draba paysonii +
species +
simple +  and stalked +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
cruciform +  and forked +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
coiled +, 1-7-veined +  and veined +
anastomosing +
scapose +  and not +
divaricate-ascending +
0.3 cm3 mm <br />0.003 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 +