Athysanus unilateralis

(M. E. Jones) Jepson

Fl. W. Calif., 224. 1901.

Basionym: Draba unilateralis M. E. Jones Bull. Torrey Bot. Club 9: 124. 1882
Synonyms: Heterodraba unilateralis (M. E. Jones) Greene
Treatment appears in FNA Volume 7. Treatment on page 268. Mentioned on page 267.

Plants pubescent. Stems (0.3–) 0.7–2.5 (–3.5) dm. Basal leaves subsessile or petiole to 0.3 cm; blade oblanceolate, obovate, or oblong, (0.3–) 0.7–2 (–2.2) cm × (2–) 4–7 mm, margins entire or with a tooth on each side, apex obtuse, surfaces uniformly pubescent, trichomes cruciform with fewer, 3-rayed ones. Cauline leaves 2–5; blade similar to but smaller than basal, (base cuneate, not auriculate). Fruiting pedicels stout, 1–2 (–3) mm. Flowers: sepals 0.6–1 × 0.4–0.6 mm; petals spatulate, 1.3–1.7 × 0.5–0.8 mm; filaments 0.5–0.9 mm; anthers 0.1–0.2 mm. Fruits elliptic, obovate, or orbicular, flattened or slightly twisted; valves thickened, veins often prominent, glabrous or uniformly pubescent, trichomes subsessile or short-stalked, cruciform and 3-rayed, sometimes mixed with stouter, simple or forked, subsetiform ones to 0.6 mm, not hooked; septum complete, (membranous); ovules 6–12 per ovary; style 0.1–0.2 mm. Seeds often 2 or more, 0.9–1.2 × 0.6–0.8 mm.


Phenology: Flowering Feb–May.
Habitat: Open grassy slopes and flats, friable clay, flood plains, adobe and heavy gumbo clay, gypsum clay slopes
Elevation: 100-900 m

Distribution

V7 358-distribution-map.gif

Calif., Oreg., Mexico (Baja California)

Discussion

It appears that Athysanus unilateralis is known in Oregon only from Jackson County; it is more widespread in California.

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 "Athysanus unilateralis"
ovate +  and globose +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +
(M. E. Jones) Jepson +
Draba unilateralis +
appendaged +  and unappendaged +
2 cm20 mm <br />0.02 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not +  and auriculate +
0.7 cm7 mm <br />0.007 m <br /> (2 cm20 mm <br />0.02 m <br />) +
dissected +, repand +, sinuate +, crenate +  and dentate +
oblong;obovate;oblong;obovate;oblanceolate +
smaller +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
sessile +  and petiolate +
well-developed +
distinct +
indistinct +
not +  and differentiated +
emarginate +  and entire +
Calif. +, Oreg. +  and Mexico (Baja California) +
100-900 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
not basally +  and dilated +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
actinomorphic +
indehiscent +  and dehiscent +
flattened +, orbicular +, obovate +  and elliptic +
Open grassy slopes and flats, friable clay, flood plains, adobe and heavy gumbo clay, gypsum clay slopes +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
with a tooth +  and entire +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
1.3mm;1.7mm +
rudimentary +
spatulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Feb–May. +
trinucleate +  and 3(-11)-colpate +
Fl. W. Calif., +
reflexed +  and recurved +
stout +  and slender +
mucilaginous +
uniseriate +  and biseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
oblong +  and flattened +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
persistent +  and caducous +
distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
reduced +
latiseptate +, twisted +  and sessile +
dehiscent +  and indehiscent +
flattened +, oblong +, obovate +  and elliptic +
latiseptate +  and unsegmented +
indehiscent +  and dehiscent +
tetradynamous +
subequal +
procumbent +  and decumbent +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
Heterodraba unilateralis +
Athysanus unilateralis +
Athysanus +
species +
short-stalked +  and subsessile +
not hooked +  and cruciform +
0 cm0 mm <br />0 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
pubescent +  and glabrous +
anastomosing +
pubescent +  and glabrous +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
aquatics +  and terrestrial +