Noccaea fendleri subsp. glauca

(A. Nelson) Al-Shehbaz & M. Koch

Syst. Bot. 29: 382. 2004.

Basionym: Thlaspi alpestre var. glaucum A. Nelson Wyoming Agric. Exp. Sta. Bull. 28: 84. 1896
Synonyms: Noccaea coloradensis (Rydberg) Holub Noccaea glauca (A. Nelson) Holub Thlaspi alpestre var. purpurascens (Rydberg) Ostenfeld Thlaspi australe Rydberg Thlaspi coloradense A. Gray Thlaspi fendleri var. coloradense (Rydberg) Maguire Thlaspi fendleri var. glaucum (A. Nelson) C. L. Hitchcock Thlaspi fendleri var. hesperium (Payson) C. L. Hitchcock Thlaspi fendleri var. tenuipes Maguire Thlaspi glaucum Thlaspi glaucum var. hesperium Payson Thlaspi glaucum var. pedunculatum Payson Thlaspi hesperium Thlaspi purpurascens
Treatment appears in FNA Volume 7. Treatment on page 602. Mentioned on page 601, 603.

Stems (0.1–)0.5–3.2(–4.5) dm. Basal leaves: petiole differentiated from blade, 0.8–1(–2) times longer than blade; blade ovate to oblong, 4–9(–15) mm wide, base cuneate. Cauline leaves (4–)7–16(–21). Racemes often lax. Fruiting pedicels horizontal to strongly descending, forming an angle to 130º with rachis. Flowers: petals white or, occasionally, pinkish purple, (3.4–)4–7(–8.5) × (1–)1.5–2.7(–4.2) mm. Fruits winged or, occasionally, not winged, obovate to obcordate, (2.5–)5–8(–12) × (1.5–)2.6–4.5(–6.6) mm, 1–2 times as long as wide, apex obtuse, truncate, to emarginate; style (0.4–)1–2.2(–3) mm. Seeds 4–6 per fruit. 2n = 14, 28.


Phenology: Flowering Apr–Aug.
Habitat: Dry or moist, open alluvial flats or fans, rocky or talus slopes, scree, limestone cliffs, alpine or subalpine meadows, near snowbanks, streamsides, forest clearings
Elevation: 300-4400 m

Distribution

V7 983-distribution-map.gif

Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Tex., Utah, Wash., Wyo., Mexico (Chihuahua).

Discussion

Subspecies glauca, which is the most morphologically variable and most widespread North American taxon in Noccaea, corresponds to Thlaspi montanum var. montanum in the sense of P. K. Holmgren (1971) and R. C. Rollins (1993). As indicated above, that variety is a strictly European taxon. Subspecies glauca exhibits a wide elevational range, and one collection, Clements 427 (US), was made at 4350 m at the summit of Pike’s Peak, Colorado.

Selected References

None.

Lower Taxa

None.
Ihsan A. Al-Shehbaz +
(A. Nelson) Al-Shehbaz & M. Koch +
Thlaspi alpestre var. glaucum +
Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Tex. +, Utah +, Wash. +, Wyo. +  and Mexico (Chihuahua). +
300-4400 m +
Dry or moist, open alluvial flats or fans, rocky or talus slopes, scree, limestone cliffs, alpine or subalpine meadows, near snowbanks, streamsides, forest clearings +
Flowering Apr–Aug. +
Noccaea coloradensis +, Noccaea glauca +, Thlaspi alpestre var. purpurascens +, Thlaspi australe +, Thlaspi coloradense +, Thlaspi fendleri var. coloradense +, Thlaspi fendleri var. glaucum +, Thlaspi fendleri var. hesperium +, Thlaspi fendleri var. tenuipes +, Thlaspi glaucum +, Thlaspi glaucum var. hesperium +, Thlaspi glaucum var. pedunculatum +, Thlaspi hesperium +  and Thlaspi purpurascens +
Noccaea fendleri subsp. glauca +
Noccaea fendleri +
subspecies +