Streptanthus hyacinthoides


Bot. Mag. 63: plate 3516. 1836.

Synonyms: Erysimum hyacinthoides (Hooker) Kuntze Euklisia hyacinthoides (Hooker) Small Icianthus atratus Greene Icianthus glabrifolius (Buckley) Greene Icianthus hyacinthoides (Hooker) Greene Streptanthus glabrifolius Buckley
Treatment appears in FNA Volume 7. Treatment on page 716. Mentioned on page 701.

Annuals; usually glabrous throughout (sometimes stem bases pubescent). Stems unbranched or branched distally, 2.8–13 dm. Basal leaves not seen. Cauline leaves (shortly petiolate or sessile); blade usually linear to linear-lanceolate, rarely oblanceolate, 2.5–16 cm × 2–7(–20) mm, (smaller distally), base not auriculate, margins entire. Racemes ebracteate. Fruiting pedicels divaricate-ascending, (straight), 3–10 mm. Flowers (slightly zygomorphic, horizontal to pendent); calyx campanulate; sepals purple, lanceolate, 7–11 mm, not keeled; petals deep purple to magenta or whitish (with purple veins), 13–20 mm, blade 7–12 × 1–4 mm, margins not crisped, claw 5–12 mm, (strongly recurved); stamens in 3 unequal pairs; filaments: abaxial pair (connate less than 1/2 their length), 8–14 mm, lateral pair 4–7 mm, adaxial pair (connate ca. 3/4 their length), 7–10 mm; anthers: abaxial and lateral pairs fertile, 2–3 mm, adaxial pairs sterile, 1–1.5 mm; gynophore 0.3–3 mm. Fruits divaricate-ascending, smooth, straight or slightly curved inwards, flattened, 3.7–11.2 cm × 1.5–2 mm; valves each with prominent midvein; replum straight; ovules 90–120 per ovary; style 0.3–1.5 mm; stigma subentire. Seeds broadly ovoid, 1.5–1.8 × 1–1.3 mm; wing 0.1–0.25 mm, continuous.

Phenology: Flowering May–Jun.
Habitat: Sandy soils of prairies, open glades in woods, grassy roadsides
Elevation: 100-800 m


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Ark., Kans., La., Okla., Tex.


Streptanthus hyacinthoides is widespread in eastern Texas and central and northwestern Oklahoma; in Arkansas it is restricted to Nevada and Ouachita counties; in Kansas to Barber and Comanche counties; and in Louisiana to Bienville, Caddo, Natchitoches, and Winn parishes.

Selected References


Lower Taxa

Ihsan A. Al-Shehbaz +
Hooker +
Ark. +, Kans. +, La. +, Okla. +  and Tex. +
100-800 m +
Sandy soils of prairies, open glades in woods, grassy roadsides +
Flowering May–Jun. +
Erysimum hyacinthoides +, Euklisia hyacinthoides +, Icianthus atratus +, Icianthus glabrifolius +, Icianthus hyacinthoides +  and Streptanthus glabrifolius +
Streptanthus hyacinthoides +
Streptanthus +
species +