Streptanthus hyacinthoides |
Streptanthus brachiatus |
|
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smooth jewelflower, smooth twistflower |
Socrates mine jewelflower |
|
Habit | Annuals; usually glabrous throughout (sometimes stem bases pubescent). | Biennials; (somewhat glaucous), glabrous throughout. |
Stems | unbranched or branched distally, 2.8–13 dm. |
usually branched basally, rarely unbranched, 1.4–5(–6) dm. |
Basal leaves | not seen. |
(soon withered); rosulate; shortly petiolate; blade (fleshy, mottled), broadly obovate to suborbicular, 1.5–4 cm, margins coarsely dentate. |
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. |
blade ovate to cordate, 0.7–3.7cm × 3–15 mm (smaller distally), base auriculate to amplexicaul, margins serrate-dentate or entire. |
Racemes | ebracteate. |
ebracteate, (lax, sometimes secund). |
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. |
calyx urceolate; sepals (erect), rose-purple (to yellowish at base), (ovate), 5–7 mm, keeled, (apex recurved); petals whitish, (abaxial pair with purple spot, adaxial pair faintly purple-veined), 7–10 mm, blade 1.5–3 × 1–1.5 mm, margins not crisped, claw 5–7 mm, as wide as or wider than blade; stamens in 3 unequal pairs; filaments: abaxial pair (connate to middle), 4–7 mm, lateral pair 2–4 mm, adaxial pair (completely connate, usually recurved), 8–10 mm; anthers: abaxial and lateral pairs fertile, 2–2.5 mm, adaxial pair sterile, 0.7–1.2 mm; gynophore 0.3–0.7 mm. |
Fruiting pedicels | divaricate-ascending, (straight), 3–10 mm. |
divaricate-ascending, (straight), 1–2 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. |
divaricate-ascending, torulose, nearly straight, flattened, 4–6 cm × 1–1.3 mm; valves each with obscure midvein; replum constricted between seeds; ovules 22–30 per ovary; style 0.1–0.4 mm; stigma subentire. |
Seeds | broadly ovoid, 1.5–1.8 × 1–1.3 mm; wing 0.1–0.25 mm, continuous. |
oblong, 1.8–2.5 × 0.7–0.9 mm; wing 0–0.1 mm wide distally. |
2n | = 28. |
|
Streptanthus hyacinthoides |
Streptanthus brachiatus |
|
Phenology | Flowering May–Jun. | Flowering Jun–Jul. |
Habitat | Sandy soils of prairies, open glades in woods, grassy roadsides | Serpentine barrens in chaparral, pine-oak or cypress woodland openings |
Elevation | 100-800 m (300-2600 ft) | 600-1000 m (2000-3300 ft) |
Distribution |
AR; KS; LA; OK; TX
|
CA |
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.) |
Of conservation concern. Streptanthus brachiatus is known from Lake and Sonoma counties. At the time that R. W. Dolan and L. F. LaPré (1989) studied it, infraspecific taxa based on differences in sepal color and pubescence seemed distinct (R. E. Buck et al. 1993). Populations discovered since then do not accord with the putative differences. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 716. | FNA vol. 7, p. 706. |
Parent taxa | Brassicaceae > tribe Thelypodieae > Streptanthus | Brassicaceae > tribe Thelypodieae > Streptanthus |
Sibling taxa | ||
Synonyms | Erysimum hyacinthoides, Euklisia hyacinthoides, Icianthus atratus, Icianthus glabrifolius, Icianthus hyacinthoides, S. glabrifolius | S. brachiatus subsp. hoffmanii |
Name authority | Hooker: Bot. Mag. 63: plate 3516. (1836) | F. W. Hoffman: Madroño 11: 230, fig. 5. (1952) |
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