Alyssum obovatum

(C. A. Meyer) Turczaninow

Bull. Soc. Imp. Naturalistes Moscou 10: 57. 1837.

Basionym: Odontarrhena obovata C. A. Meyer in C. F. von Ledebour, Fl. Altaica 3: 61. 1831
Synonyms: Alyssum americanum Greene Alyssum biovulatum N. Busch Alyssum fallax Nyárády
Treatment appears in FNA Volume 7. Treatment on page 250. Mentioned on page 248.

Perennials; (cespitose, caudex often woody); canescent throughout, trichomes 10–25-rayed. Stems often several from base (often with sterile shoots), usually erect or ascending, 0.7–1.5 (–2) dm. Cauline leaves subsessile; blade broadly oblanceolate, obovate-spatulate, or obovate, 0.6–1.4 (–1.7) cm × (1–) 2–6 mm (gradually smaller distally), base attenuate, apex rounded, obtuse, or subacute. (Racemes corymbose, simple, or in panicles terminating each stem.) Fruiting pedicels divaricate, straight, slender, (2–) 3–7 (–9) mm, trichomes uniformly stellate. Flowers: sepals oblong, 1.5–2 × 0.7–1 mm, stellate-pubescent; petals yellow, broadly spatulate, 2.5–3.5 (–4) × 1–1.5 mm, base attenuate, apex often obtuse or rounded, glabrous abaxially; filaments: median pairs unilaterally broadly winged, apically 1-toothed, lateral pair with lanceolate or narrowly oblong basal appendage, apically obtuse or subacute, 1.5–2 mm; anthers oblong, 0.3–0.4 mm. Fruits broadly elliptic or obovate, 3–4.5 (–5) × 2.5–3.5 mm, apex obtuse to rounded; valves inflated at middle or on 1 side, flattened at margins, densely stellate-pubescent; ovules (1 or) 2 per ovary; style (slender), 1.5–2 mm, glabrous. Seeds ovoid, compressed, 1–1.7 × 0.8–1.2 mm, not winged or margined. 2n = 16, 32.


Phenology: Flowering May–Jul.
Habitat: Mountain slopes, cliffs, gravel, rocky places
Elevation: 500-1500 m

Discussion

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 "Alyssum obovatum"
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
Obtuse (?) +  and Rounded (?) +
Ihsan A. Al-Shehbaz +
(C. A. Meyer) Turczaninow +
oblong +  and lanceolate +
sessile +  and petiolate +
not +  and rosulate +
attenuate +
Odontarrhena obovata +
appendaged +  and unappendaged +
1.4 cm14 mm <br />0.014 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
dissected +, repand +, sinuate +, crenate +  and dentate +
obovate;obovate-spatulate;obovate;obovate-spatulate;oblanceolate +
much smaller +  and reduced +
2mm;6mm +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
not +  and differentiated +
emarginate +  and entire +
incumbent +  and accumbent +
Yukon +, Alaska +, c +  and e Asia +
500-1500 m +
straight +  and curved +
connate +  and distinct +
lateral +  and median +
subacute +, obtuse +  and 1-toothed +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
actinomorphic +
latiseptate +  and sessile +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
3mm;4.5mm +
obovate +  and elliptic +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
latiseptate +  and unsegmented +
Mountain slopes, cliffs, gravel, rocky places +
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 />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
rudimentary +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering May–Jul. +
trinucleate +  and 3(-11)-colpate +
Bull. Soc. Imp. Naturalistes Moscou +
elongated +
reflexed +  and ascending +
stout +  and slender +
not +  and branched +
not +  and mucilaginous +
margined +  and not winged +
aseriate +  and biseriate +
not +  and mucilaginous +
White (?) +, Black (?) +, Brown (?) +  and Yellow (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
compressed +  and ovoid +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
persistent +  and caducous +
distinct +
erect +  and spreading +
stellate-pubescent +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
branched +  and unbranched +
procumbent +  and decumbent +
ascending +  and erect +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Alyssum americanum +, Alyssum biovulatum +  and Alyssum fallax +
Alyssum obovatum +
species +
simple +  and sessile +
stellate-pubescent +
flattened +  and inflated +
anastomosing +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +