Flora of North America species comparison

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Erysimum suffrutescens

island wallflower, suffrutescent wallflower
Habit Perennials or subshrubs.
Stems

ascending, proximal branches terminating in sterile rosettes, (woody at base), 1.5–8.1 dm.
Basal leaves

blade linear to linear-oblanceolate, 3.7–15 cm × 1.5–6(–7) mm, base attenuate, margins usually entire, rarely sparsely denticulate, apex acute.
Cauline leaves

(distal) sessile;

blade similar to basal.
Racemes

considerably elongated in fruit.
Flowers

sepals oblong to linear-oblong, 6–11 mm, lateral pair saccate basally;

petals yellow, obovate to suborbicular, (11–)14–20(–22) × (3–)4–11.5 mm, claw 8–13 mm, apex rounded;

median filaments 7–11 mm;

anthers linear, 2.5–4 mm.
Fruiting pedicels

ascending, slender, narrower than fruit, (3–)5–10 mm.
Fruits

ascending to spreading, narrowly linear, straight or only slightly curved inward, not torulose, (2–)3–8.4(–11) cm × 1.5–2.4(–3.5) mm, 4-angled to only slightly latiseptate, not striped;

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

ovules 48–82 per ovary;

style cylindrical, stout, 0.5–4 mm, sparsely pubescent;

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

oblong, 1.5–2.5(–3) × (0.7–)1–1.2(–1.4) mm;

not winged or winged apically.
Trichomes

of leaves 2-rayed, sometimes mixed with 3- or 4-rayed ones.
2n

= 36.

Erysimum suffrutescens
Phenology Flowering Dec–Aug.
Habitat Stabilized coastal sand dunes, coastal scrub vegetation
Elevation 0-150 m (0-500 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Erysimum suffrutescens is restricted to the coastal regions of Los Angeles County northward into San Luis Obispo, Santa Barbara, and Ventura counties. Both G. B. Rossbach (1958, 1958b) and R. C. Rollins (1993) treated it as a distinct species, but R. A. Price (1993) transferred it (invalidly) to a subspecies of E. insulare. The latter species has angustiseptate (versus 4-angled to slightly latiseptate) fruits, and the two are sufficiently distinct to be recognized as independent species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 544.
Parent taxa Brassicaceae > tribe Erysimeae > Erysimum
Sibling taxa
E. ammophilum, E. arenicola, 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. teretifolium
Synonyms Cheiranthus suffrutescens, E. concinnum subsp. suffrutescens, E. suffrutescens var. grandifolium
Name authority (Abrams) Rossbach: Aliso 4: 121. (1958)
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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