Flora of North America species comparison

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Erysimum arenicola

Cascade wallflower, sand-dwelling wallflower
Habit Perennials; (caudex simple or many-branched).
Stems

erect, unbranched or branched (several) basally, 0.4–3 dm.
Basal leaves

blade usually oblanceolate, rarely spatulate, 2–8 cm × 3–10 mm, base attenuate, margins entire or dentate, apex acute or obtuse.
Cauline leaves

(distal) sessile;

blade margins entire or dentate-sinuate.
Racemes

considerably elongated in fruit.
Flowers

sepals oblong to linear-oblong, 7–10 mm, lateral pair saccate basally;

petals yellow, obovate, 14–27 × 3.5–6 mm, claw 9–13 mm, apex rounded;

median filaments 9–12 mm;

anthers linear, 2–3.5 mm.
Fruiting pedicels

divaricate-ascending, slender, narrower than fruit, 5–8 mm.
Fruits

erect to ascending, narrowly linear, often straight, sometimes twisted, strongly torulose, 3–10(–12) cm × 1.5–2.7 mm, latiseptate, not striped;

valves with somewhat prominent midvein, pubescent outside, trichomes 2–4-rayed, glabrous inside;

ovules 24–42 per ovary;

style cylindrical, slender, 1.5–5 mm, sparsely pubescent;

stigma slightly 2-lobed, lobes as long as wide.
Seeds

oblong, 2–3.5 × 0.8–1.5 mm;

not winged or winged distally.
Trichomes

of leaves 2- or 3-rayed.
2n

= 36.

Erysimum arenicola
Phenology Flowering Jun–Aug.
Habitat Rock crevices, talus slopes, alpine areas, open ridges, gravelly ground
Elevation 900-2200 m (3000-7200 ft)
Distribution
from FNA
OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Erysimum arenicola is distributed at the higher elevations of northern Oregon northward into the Olympic and Cascade mountains in Washington and Vancouver Island.

Both G. B. Rossbach (1958) and R. C. Rollins (1993) recognized Erysimum arenicola as a distinct species. It is closely related to E. perenne and both can be easily distinguished from E. capitatum, with which they hybridize where their ranges meet, by the strongly torulose (versus not torulose) fruits and the longer styles 1.5–5.5 versus 0.2–2.5(–3) mm.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 536.
Parent taxa Brassicaceae > tribe Erysimeae > Erysimum
Sibling taxa
E. ammophilum, E. asperum, E. capitatum, E. cheiranthoides, E. cheiri, E. coarctatum, E. concinnum, E. franciscanum, E. hieraciifolium, E. inconspicuum, E. insulare, E. menziesii, E. occidentale, E. pallasii, E. perenne, E. repandum, E. suffrutescens, E. teretifolium
Synonyms Cheiranthus arenicola, E. arenicola var. torulosum, E. torulosum
Name authority S. Watson: Proc. Amer. Acad. Arts 26: 124. (1891)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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