Noccaea fendleri subsp. idahoensis

(Payson) Al-Shehbaz & M. Koch

Syst. Bot. 29: 383. 2004.

Basionym: Thlaspi idahoense Payson Univ. Wyoming Publ. Sci., Bot. 1: 159. 1926
Synonyms: Thlaspi aileeniae Rollins Thlaspi fendleri var. idahoense (Payson) C. L. Hitchcock Thlaspi idahoense var. aileeniae (Rollins) Rollins Thlaspi montanum var. idahoense (Payson) P. K. Holmgren
Treatment appears in FNA Volume 7. Treatment on page 603. Mentioned on page 601, 602.

Stems (0.3–) 0.4–1.1 (–1.2) dm. Basal leaves: petiole not differentiated from blade, about as long as blade; blade linear to narrowly oblanceolate, 1.1–4 (–5) mm wide, base attenuate. Cauline leaves (2 or) 3–7 (–9). Racemes lax or slightly compact. Fruiting pedicels horizontal or subhorizontal, forming an angle more than 70º with rachis. Flowers: petals white, (3.4–) 3.6–6 × 1–2 mm. Fruits only slightly winged, obovate or, rarely, elliptic, (4–) 5–8 (–9.5) × (2.5–) 2.7–4 (–4.5) mm, 1–2 times as long as wide, apex obtuse, truncate, or emarginate; style (0.5–) 0.8–2 (–2.5) mm. Seeds 2–8 per fruit. 2n = 14, 28.


Phenology: Flowering Jun–Aug.
Habitat: Alpine or subalpine slopes, meadows, rocky crevices, rocky and gravelly soil in valleys, steep slopes, knolls
Elevation: 2100-3700 m

Discussion

Subspecies idahoensis is restricted to Blaine, Boise, Custer, Elmore, and Valley counties of central Idaho. Holmgren treated it as a variety of Thlaspi montanum, whereas R. C. Rollins (1993) recognized it as a species, T. idahoense, with two varieties. In my opinion, his varieties are based on continuous characters such as the loosely versus closely branched caudex, oblanceolate versus linear-oblanceolate basal leaves, and cuneate versus minutely auriculate distalmost cauline leaves.

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.

subhorizontal +  and horizontal +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
emarginate +  and truncate +
Ihsan A. Al-Shehbaz +
(Payson) Al-Shehbaz & M. Koch +
subamplexicaul +
attenuate +
Thlaspi idahoense +
appendaged +  and unappendaged +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
dissected +, repand +, sinuate +, crenate +  and dentate +
linear;narrowly oblanceolate +
much smaller +  and reduced +
1.1mm;4mm +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
differentiated +
emarginate +  and entire +
2100-3700 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
actinomorphic +
0.8 cm8 mm <br />0.008 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
, +  and obovate +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
angustiseptate +
Alpine or subalpine slopes, meadows, rocky crevices, rocky and gravelly soil in valleys, steep slopes, knolls +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
dentate +  and entire +
dentate;denticulate;dentate;denticulate;entire +
1 +, 4 +  and 2 +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
0.36 cm3.6 mm <br />0.0036 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
rudimentary +
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 /> (7.3 cm73 mm <br />0.073 m <br />) +
not differentiated +
Flowering Jun–Aug. +
trinucleate +  and 3(-11)-colpate +
elongated +
horizontal +  and ascending +
slender +
0.25 cm2.5 mm <br />0.0025 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
mucilaginous +
aseriate +, biseriate +  and uniseriate +
not +  and mucilaginous +
2 +  and 8 +
ovoid +  and compressed +
1.1mm +  and 2.1mm +
persistent +  and caducous +
distinct +
ovate +  and oblong +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
branched +, unbranched +  and simple +
procumbent +  and decumbent +
ascending +  and erect +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
persistent +
distinct +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Thlaspi aileeniae +, Thlaspi fendleri var. idahoense +, Thlaspi idahoense var. aileeniae +  and Thlaspi montanum var. idahoense +
Noccaea fendleri subsp. idahoensis +
Noccaea fendleri +
subspecies +
eglandular +, peltate +, malpighiaceous +, dendritic +, sessile +, stalked +, simple +  and unicellular +
scale-like +  and forked +
pubescent +  and glabrous +
anastomosing +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +