Streptanthus barbiger |
Streptanthus maculatus |
|
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bearded jewelflower |
clasping jewelflower, clasping twistflower |
|
Habit | Annuals; glabrous, (sometimes sepals pubescent). | Annuals; (glaucous), usually glabrous throughout (sometimes stem bases pubescent). |
Stems | branched basally, (0.7–)1–6.7(–8) dm. |
unbranched or branched distally, 1.7–10.6 dm, (trichomes 0.05–0.5 mm). |
Basal leaves | (soon withered); not rosulate; petiolate; blade oblanceolate or oblong to lanceolate, 2–5(–7) cm (5–15 mm wide), margins remotely dentate. |
(soon withered); rosulate; petiolate; blade similar to cauline. |
Cauline leaves | blade linear to linear-lanceolate, (1.5–)3–9(–10) cm × 0.5–2 mm (smaller distally), base not auriculate, margins entire. |
blade broadly ovate to broadly oblong or lanceolate, 2–15 cm × 10–80 mm, (smaller distally), base amplexicaul, margins entire, (apex acute to acuminate or rounded). |
Racemes | ebracteate, (lax, often secund). |
ebracteate, (dense or lax). |
Flowers | calyx urceolate; sepals (erect), green to purplish, (ovate), 4–6 mm, slightly keeled, (apex recurved, glabrous or hirsute, trichomes retrorse); petals white (abaxial pair with purplish veins), 6–9 mm, blade 2–4 × 1.5–2.5 mm, margins not crisped, claw 4–6 mm, narrower than blade; stamens in 3 unequal pairs; filaments: abaxial pair (connate to middle), 4.5–5.5 mm, lateral pair 2.5–3.5 mm, adaxial pair (connate, strongly recurved, purplish), 7–9 mm; anthers: abaxial and lateral pairs fertile, 1.5–2.2mm, adaxial pair sterile, 0.4–1 mm; gynophore 0.3–1 mm. |
calyx campanulate; sepals (erect), purplish, 4–9 mm, (lateral pair rarely with subapical callus, 0.1–0.3 mm), not keeled; petals (widely spreading to somewhat reflexed), magenta (with deep purple center), 11–21 mm, blade 6–12 × 5–11 mm, margins not crisped, claw 5–10 mm, narrower than blade; stamens tetradynamous; filaments: median pairs (distinct), 5–7 mm, lateral pair 3–5 mm; anthers (all) fertile, 3–4 mm; gynophore 0.7–1.5 mm. |
Fruiting pedicels | ascending to divaricate, 1–2.5(–4) mm. |
divaricate-ascending, (straight), 4–7 mm. |
Fruits | divaricate-ascending to reflexed, slightly torulose, curved or, rarely, straight, slightly flattened, 2–6(–7) cm × 1.2–1.5 mm; valves each with obscure midvein; replum straight; ovules 22–38 per ovary; style 0.1–0.7 mm; stigma entire. |
ascending, smooth, straight, flattened, 6–11.4 cm × 2–3 mm; valves each with prominent midvein; replum straight; ovules 56–92 per ovary; style 1–2.5 mm; stigma strongly 2-lobed. |
Seeds | narrowly oblong, 1.3–1.8x 0.6–0.8 mm; wing (0–)0.1–0.25 mm wide distally, (narrower at margin or absent). |
broadly oblong, 2–2.5 × 1–1.3 mm; wing 0.2–0.3 mm wide, continuous. |
2n | = 28. |
|
Streptanthus barbiger |
Streptanthus maculatus |
|
Phenology | Flowering May–Aug. | Flowering Apr–May. |
Habitat | Serpentine ridges and barrens, openings in chaparral, cypress or pine-oak woodlands | Near creeks, roadside banks, moist bottoms, open oak woods, moist land in woods, rocky bluffs, ledges, dry talus slopes, rock crevices, pine-hickory forests |
Elevation | 200-1500 m (700-4900 ft) | 200-500 m (700-1600 ft) |
Distribution |
CA
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AR; OK; TX
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Discussion | Streptanthus barbiger is distributed in Lake, Mendocino, Sonoma, and Tehama counties. Its holotype has pubescent sepals; most of the collections examined have glabrous ones, though plants with pubescent sepals occur throughout the species range. R. E. Buck et al. (1993) suggested that the two forms apparently represent distinct taxa. This is highly unlikely because both forms occur sometimes in the same population, as evidenced by Breedlove 5145 (GH). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Streptanthus maculatus is distributed in Arkansas in Garland, Hot Springs, Montgomery, Pike, Polk, Pulaski, and Saline counties; in Oklahoma in Latimer, Le Flore, McCurtain, and Pushmataha counties; and in Texas in Anderson, Cherokee, Gregg, and Smith counties. R. C. Rollins (1993) divided Streptanthus maculatus into two subspecies based on the presence versus absence of the subapical callus on sepals and on leaf shape. Subspecies maculatus was said to differ from subsp. obtusifolius by the absence (versus presence) of the sepal callus and by having lanceolate (versus broadly ovate) cauline leaves. These highly variable characters do not covary. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 704. | FNA vol. 7, p. 718. |
Parent taxa | Brassicaceae > tribe Thelypodieae > Streptanthus | Brassicaceae > tribe Thelypodieae > Streptanthus |
Sibling taxa | ||
Synonyms | Mesoreanthus barbiger | S. maculatus subsp. obtusifolius, S. obtusifolius |
Name authority | Greene: Pittonia 1: 217. (1888) | Nuttall: J. Acad. Nat. Sci. Philadelphia 5: 134, plate 7. (1825) |
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