Draba asterophora

Payson

Amer. J. Bot. 4: 263. 1917.

Synonyms: Draba asterophora var. macrocarpa C. L. Hitchcock
Treatment appears in FNA Volume 7. Treatment on page 294. Mentioned on page 270, 276, 278, 282.

Perennials; (loosely cespitose); caudex branched (somewhat surculose, with persistent leaf-bases, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.3–1.1 dm, glabrous throughout or sparsely pubescent proximally, trichomes (2–) 4-rayed, 0.1–0.3 mm. Basal leaves rosulate; petiolate; petiole obsolete, margin rarely ciliate proximally; blade (somewhat fleshy), broadly obovate to suborbicular or spatulate, 0.4–1.4 (–1.7) cm × (2–) 3–6 (–7) mm, margins entire, surfaces pubescent, trichomes stalked, cruciform, and 2-rayed, 3-rayed, or 5-rayed, 0.2–0.6 mm. Cauline leaves 0 (or 1, as a bract). Racemes (5–) 8–20 (–27) -flowered, usually ebracteate, rarely proximalmost flowers bracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels horizontal to divaricate-ascending, straight or curved upward, 3–9 mm, glabrous. Flowers: sepals oblong, 3–4 mm, glabrous or sparsely pubescent, (trichomes subapical, short-stalked, 2–4-rayed); petals bright-yellow, oblanceolate, 5–7 × 1.5–2.5 mm; anthers ovate, 0.5–0.6 mm. Fruits lanceolate-ovate to broadly ovate or oblong, slightly twisted or plane, strongly flattened, 5–11 (–14) × (3.5–) 4–6 mm; valves glabrous or, rarely, puberulent, trichomes simple and short-stalked, 2-rayed or 3-rayed, 0.05–0.3 mm; ovules 12–18 per ovary; style 0.2–1.6 (–2) mm. Seeds (winged), ovate, 1.8–2.8 × 1.2–2 mm; (wing 0.5–1 mm wide). 2n = 40.


Phenology: Flowering Jun–Aug.
Habitat: Granitic rock outcrops, talus, gravelly soil
Elevation: 2600-3300 m

Discussion

C. L. Hitchcock (1941) and R. C. Rollins (1993) divided Draba asterophora into two varieties based on minor differences in style and fruit lengths. These do not appear to define genetically discrete taxa. The species apparently is restricted to El Dorado County, California, and the Carson Range in Washoe County, Nevada.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."not" is not a number. "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 asterophora"
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Payson +
appendaged +  and unappendaged +
1.4 cm14 mm <br />0.014 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not +  and auriculate +
0.4 cm4 mm <br />0.004 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
lobed +, toothed +  and entire +
broadly obovate;suborbicular or spatulate +
much smaller +  and reduced +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
urceolate +, campanulate +  and tubular +
scapose +  and branched +
sessile +  and petiolate +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Calif. +  and Nev. +
2600-3300 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
not basally +  and dilated +
orange;purple;orange;purple;pink;white;yellow +
spreading +, ascending +  and erect +
proximalmost +
linear +, oblanceolate +, spatulate +, obovate +, subsaccate +, not saccate +, oblong +  and ovate +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
indehiscent +  and dehiscent +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
flattened +, plane +, lanceolate-ovate +  and broadly ovate or oblong +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Granitic rock outcrops, talus, gravelly soil +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
bright-yellow +
rudimentary +
oblanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Jun–Aug. +
trinucleate +  and 3(-11)-colpate +
Amer. J. Bot. +
ebracteate;(5-)8-20(-27)-flowered +
ascending +  and erect +
slender +
curved +, straight +  and not flexuous +
horizontal +  and divaricate-ascending +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
pubescent +  and glabrous +
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 +
procumbent +  and decumbent +
prostrate +  and decumbent +
usually erect +  and ascending +
pubescent +  and glabrous +
subsessile +, sessile +  and petiolate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
persistent +
distinct +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
Draba asterophora var. macrocarpa +
Draba asterophora +
species +
short-stalked +, simple +  and stalked +
cruciform +
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 +
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 +