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smooth jewelflower, smooth twistflower

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

Phenology Flowering May–Jun.
Habitat Sandy soils of prairies, open glades in woods, grassy roadsides
Elevation 100-800 m (300-2600 ft)
Distribution
from FNA
AR; KS; LA; OK; TX
[WildflowerSearch map]
[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.)

Source FNA vol. 7, p. 716.
Parent taxa 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
Synonyms Erysimum hyacinthoides, Euklisia hyacinthoides, Icianthus atratus, Icianthus glabrifolius, Icianthus hyacinthoides, S. glabrifolius
Name authority Hooker: Bot. Mag. 63: plate 3516. (1836)
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