Streptanthus hyacinthoides |
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smooth jewelflower, smooth twistflower |
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Habit | 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. |
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. |
Fruiting pedicels | divaricate-ascending, (straight), 3–10 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. |
Streptanthus hyacinthoides |
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Phenology | Flowering May–Jun. |
Habitat | Sandy soils of prairies, open glades in woods, grassy roadsides |
Elevation | 100-800 m (300-2600 ft) |
Distribution |
AR; KS; LA; OK; TX
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Discussion | 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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 716. |
Parent taxa | Brassicaceae > tribe Thelypodieae > Streptanthus |
Sibling taxa | |
Synonyms | Erysimum hyacinthoides, Euklisia hyacinthoides, Icianthus atratus, Icianthus glabrifolius, Icianthus hyacinthoides, S. glabrifolius |
Name authority | Hooker: Bot. Mag. 63: plate 3516. (1836) |
Web links |