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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
from FNA
AR; KS; LA; OK; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
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
S. barbatus, S. barbiger, S. batrachopus, S. bernardinus, S. brachiatus, S. bracteatus, S. breweri, S. callistus, S. campestris, S. carinatus, S. cordatus, S. cutleri, S. diversifolius, S. drepanoides, S. farnsworthianus, S. fenestratus, S. glandulosus, S. gracilis, S. hesperidis, S. hispidus, S. howellii, S. insignis, S. longisiliquus, S. maculatus, S. morrisonii, S. oblanceolatus, S. oliganthus, S. petiolaris, S. platycarpus, S. polygaloides, S. squamiformis, S. tortuosus, S. vernalis, S. vimineus
S. barbatus, S. barbiger, S. batrachopus, S. bernardinus, S. bracteatus, S. breweri, S. callistus, S. campestris, S. carinatus, S. cordatus, S. cutleri, S. diversifolius, S. drepanoides, S. farnsworthianus, S. fenestratus, S. glandulosus, S. gracilis, S. hesperidis, S. hispidus, S. howellii, S. hyacinthoides, S. insignis, S. longisiliquus, S. maculatus, S. morrisonii, S. oblanceolatus, S. oliganthus, S. petiolaris, S. platycarpus, S. polygaloides, S. squamiformis, S. tortuosus, S. vernalis, S. vimineus
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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