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Mt. Tamalpais jewelflower, Tamalpais jewel flower

smooth jewelflower, smooth twistflower

Habit Annuals; (glaucous), glabrous throughout. Annuals; usually glabrous throughout (sometimes stem bases pubescent).
Stems

unbranched or branched basally, 0.3–1.7(–2.8) dm.

unbranched or branched distally, 2.8–13 dm.

Basal leaves

(soon withered);

not rosulate; shortly petiolate;

blade (succulent, mottled), obovate to oblanceolate, 0.5–2 cm, margins coarsely dentate.

not seen.

Cauline leaves

blade lanceolate, 0.5–2.5 cm × 1–7 mm (smaller distally), base auriculate, margins entire or dentate (entire distally).

(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 (lax, sometimes secund).

ebracteate.

Flowers

calyx urceolate;

sepals (erect) reddish purple, (ovate), 3–5 mm, keeled, (apex spreading);

petals whitish (abaxial pair with purplish veins, adaxial pair purple), 5–8 mm, blade 2–3 × 1–1.5 mm, margins not crisped, claw 3–4 mm;

stamens in 3 unequal pairs;

filaments: abaxial pair (connate to middle), 3–4 mm, lateral pair 1.5–2.5 mm, adaxial pair (completely connate, not recurved), 5–6 mm;

anthers: abaxial and lateral pairs fertile, 1.4–1.7 mm, adaxial pairs sterile, 0.3–0.5 mm;

gynophore 0.3–0.7 mm.

(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, 1–2.5(–4) mm.

divaricate-ascending, (straight), 3–10 mm.

Fruits

divaricate-ascending, slightly torulose, straight to slightly curved, slightly flattened, 1.3–3 cm × 1–1.5 mm;

valves each with obscure midvein;

replum straight;

ovules 12–22 per ovary;

style 0.2–0.8 mm;

stigma entire.

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

oblong, 1.3–2 × 0.8–1.2 mm;

wing 0.1–0.3 mm wide distally, (narrower at margin, rarely absent).

broadly ovoid, 1.5–1.8 × 1–1.3 mm;

wing 0.1–0.25 mm, continuous.

2n

= 28.

Streptanthus batrachopus

Streptanthus hyacinthoides

Phenology Flowering May–Jun. Flowering May–Jun.
Habitat Serpentine barrens and outcrops in chaparral Sandy soils of prairies, open glades in woods, grassy roadsides
Elevation 100-600 m (300-2000 ft) 100-800 m (300-2600 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; KS; LA; OK; TX
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Streptanthus batrachopus is known from Mt. Tamalpais, Marin County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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. 705. FNA vol. 7, p. 716.
Parent taxa Brassicaceae > tribe Thelypodieae > Streptanthus Brassicaceae > tribe Thelypodieae > Streptanthus
Sibling taxa
S. barbatus, S. barbiger, 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. 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
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 J. L. Morrison: Madroño 4: 204, plate 31, figs. 20–28. (1938) Hooker: Bot. Mag. 63: plate 3516. (1836)
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