Draba platycarpa

Torrey & A. Gray

Fl. N. Amer. 1: 108. 1838.

IllustratedEndemic
Synonyms: Draba cuneifolia var. platycarpa (Torrey & A. Gray) S. Watson Draba viperensis H. St. John
Treatment appears in FNA Volume 7. Treatment on page 330. Mentioned on page 273, 331.

Annuals; scapose or subscapose. Stems often unbranched, sometimes branched proximally, (0.3–) 0.5–3.2 (–4) dm, densely hirsute proximally, trichomes simple, 0.9–1.5 mm, and stalked, 2–4-rayed, 0.1–0.6 mm, pubescent distally, trichomes usually branched, rarely simple ones present. Basal leaves rosulate; petiole obscure; blade obovate to spatulate or oblanceolate, 1–4.5 cm × 5–25 (–30) mm, margins dentate, surfaces pubescent, abaxially with stalked, (2 or) 3 or 4-rayed trichomes, 0.1–0.6 mm, adaxially with simple, 0.7–1.3 mm, and stalked, 2–4-rayed ones, 0.1–0.5 mm. Cauline leaves (3 or) 4–8 (–14); sessile; blade similar to basal. Racemes 12–45 (–60) -flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent, trichomes 2–4-rayed. Fruiting pedicels horizontal to divaricate, straight, 4–9 (–11) mm, pubescent as stem. Flowers: (mid and late-season ones cleistogamous, apetalous); sepals oblong, 1.4–2.2 mm, pubescent; petals white, oblanceolate, (1.7–) 2.5–3.5 (–4) × 1–2 mm; anthers ovate, 0.2–0.35 mm (shorter in cleistogamous flowers). Fruits obovate-oblong to obovate, plane, flattened, 5–8.2 (–9.5) × (2.4–) 2.8–3.7 (–4) mm; valves pubescent, trichomes simple, antrorse, 0.2–0.5 mm; ovules (28–) 40–70 (–82) per ovary; style 0.01–0.2 mm. Seeds ovoid, 0.5–0.7 × 0.3–0.5 mm. 2n = 16, 32.


Phenology: Flowering Feb–Mar.
Habitat: Rocky hillsides, gravelly and sandy areas, dry plains, roadsides
Elevation: 0-500 m

Distribution

V7 451-distribution-map.gif

Ariz., Ark., Idaho, La., Okla., Oreg., Tex., Wash.

Discussion

Draba platycarpa is occasionally treated as a variety of D. cuneifolia, but is amply distinct from that species (R. L. Hartman et al. 1975).

Selected References

None.

Lower Taxa

None.

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

... more about "Draba platycarpa"
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.035 cm0.35 mm <br />3.5e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Torrey & A. Gray +
sessile +  and petiolate +
appendaged +  and unappendaged +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not +  and auriculate +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
lobed +, toothed +  and entire +
obovate;spatulate or oblanceolate +
much smaller +  and reduced +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Ariz. +, Ark. +, Idaho +, La. +, Okla. +, Oreg. +, Tex. +  and Wash. +
0-500 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 +
0.82 cm8.2 mm <br />0.0082 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
indehiscent +  and dehiscent +
0.5 cm5 mm <br />0.005 m <br /> (0.82 cm8.2 mm <br />0.0082 m <br />) +
flattened +, plane +, obovate-oblong +  and obovate +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
Rocky hillsides, gravelly and sandy areas, dry plains, roadsides +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2.5mm;3.5mm +
rudimentary +
oblanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Feb–Mar. +
trinucleate +  and 3(-11)-colpate +
Fl. N. Amer. +
ebracteate;12-45(-60)-flowered +
ascending +  and erect +
slender +
not flexuous +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.22 cm2.2 mm <br />0.0022 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 +
Illustrated +  and Endemic +
tetradynamous +
branched +  and unbranched +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
straight +
procumbent +  and decumbent +
prostrate +  and decumbent +
pubescent +  and hirsute +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.001 cm0.01 mm <br />1.0e-5 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Draba cuneifolia var. platycarpa +  and Draba viperensis +
Draba platycarpa +
species +
simple +, stalked +  and branched +
cruciform +  and forked +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
anastomosing +
subscapose +  and scapose +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +