Draba pterosperma

Payson

Amer. J. Bot. 4: 266. 1917.

Endemic
Treatment appears in FNA Volume 7. Treatment on page 332. Mentioned on page 270, 286.

Perennials; (densely cespitose to pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.3–1.1 dm, pubescent throughout, trichomes subdendritic, 2–7-rayed, (often crisped), 0.2–0.7 mm. Basal leaves (densely imbricate); rosulate; petiolate; petiole base and margin ciliate, (trichomes simple or branched, often crisped, 0.3–1 mm); blade oblanceolate to obovate or spatulate, 0.2–0.7 cm × 1–2.8 mm, margins entire, surfaces densely pubescent (often grayish) with stellate-dendritic, stalked, 5–12-rayed, (often crisped) trichomes, 0.2–0.6 mm. Cauline leaves 0. Racemes 4–12-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels erect (and subappressed to rachis) or ascending, straight, (3–) 4–9 (–12) mm, pubescent as stem. Flowers: sepals oblong, 3–4 mm, pubescent, (trichomes stalked, branched, crisped); petals yellow, oblanceolate, 6–7 × 1.5–2.5 mm; anthers oblong, 0.7–0.9 mm. Fruits broadly ovate to lanceolate or subelliptic, plane, flattened, 5–10 (–13) × (2.5–) 3.5–5 (–6) mm; valves pubescent, trichomes short stalked, 2–7-rayed, (straight or crisped), 0.15–0.6 mm; ovules 8–12 per ovary; style 1.5–3 (–3.8) mm. Seeds (winged), ovate, 1.6–3 × 1.3–1.8 mm; (wing 0.3–0.9 mm wide).


Phenology: Flowering Jun–Sep.
Habitat: Limestone and marble outcrops, talus, gravel slopes
Elevation: 1500-2500 m

Discussion

Draba pterosperma is a distinctive species that is restricted to the Marble Mountains of northern California (Siskiyou County).

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number.

... more about "Draba pterosperma"
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Payson +
appendaged +  and unappendaged +
not +  and auriculate +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
lobed +, toothed +  and entire +
oblanceolate;obovate or spatulate +
much smaller +  and reduced +
0.1 cm1 mm <br />0.001 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
urceolate +, campanulate +  and tubular +
scapose +  and branched +
sessile +  and petiolate +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
1500-2500 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 />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
indehiscent +  and dehiscent +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
flattened +, plane +, broadly ovate +  and lanceolate or subelliptic +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Limestone and marble outcrops, talus, gravel slopes +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
rudimentary +
oblanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Jun–Sep. +
trinucleate +  and 3(-11)-colpate +
Amer. J. Bot. +
ebracteate;4-12-flowered +
ascending +  and erect +
slender +
not flexuous +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
0.3 cm3 mm <br />0.003 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 +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
straight +
procumbent +  and decumbent +
prostrate +  and decumbent +
ascending +  and erect +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
subsessile +, sessile +  and petiolate +
0.3 cm3 mm <br />0.003 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
persistent +
distinct +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Abdra +, Erophila +, Nesodraba +  and Tomostima +
Draba pterosperma +
species +
stalked +, stellate-dendritic +  and subdendritic +
cruciform +  and forked +
0.015 cm0.15 mm <br />1.5e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 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 +