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Laguna Mountain jewelflower, Laguna Mountains. jewel flower

Mt. Tamalpais jewelflower, Tamalpais jewel flower

Habit Perennials; (caudex woody, often elevated); (glaucous), glabrous, (petioles and sepal apices pubescent). Annuals; (glaucous), glabrous throughout.
Stems

unbranched or branched (few), 2.5–8.6 dm.

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

Basal leaves

not rosulate; petiolate (petioles ciliate);

blade oblanceolate to spatulate, 2–8 cm (7–-25 mm wide), margins remotely dentate apically.

(soon withered);

not rosulate; shortly petiolate;

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

Cauline leaves

blade ovate to lanceolate, 2–10 cm × 5–28 mm (smaller distally), base amplexicaul, margins entire, (apex acute to acuminate).

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

Racemes

ebracteate, (lax in bud).

ebracteate (lax, sometimes secund).

Flowers

calyx campanulate;

sepals (ascending), pale yellow to white, (broadly oblong to ovate) 5–9 mm, not keeled;

petals white, 7–11 mm, blade 2–4 × 1–1.3 mm, margins not crisped, claw 6–9 mm, wider than blade;

stamens nearly tetradynamous;

filaments: median pairs (distinct), 6.5–8.5 mm, lateral pair 4.5–5.5 mm;

anthers (all) fertile, 3.5–4.5 mm;

gynophore 0.5–1.5 mm.

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.

Fruiting pedicels

divaricate-ascending, (straight), 4–7.5 mm.

divaricate-ascending, 1–2.5(–4) mm.

Fruits

ascending to spreading, smooth, straight or curved, flattened, 5–12.7 cm × 1.5–3 mm;

valves each with obscure midvein (at least distally);

replum straight;

ovules 36–56 per ovary;

style 0.8–2.5 mm;

stigma subentire.

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.

Seeds

oblong, 2–3 × 1.4–2 mm;

wing 0.1–0.2 mm wide at apex.

oblong, 1.3–2 × 0.8–1.2 mm;

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

2n

= 28.

= 28.

Streptanthus bernardinus

Streptanthus batrachopus

Phenology Flowering Jun–Aug. Flowering May–Jun.
Habitat Dry open pine or cypress woods, chaparral Serpentine barrens and outcrops in chaparral
Elevation 1200-2500 m (3900-8200 ft) 100-600 m (300-2000 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Streptanthus bernardinus is known from San Bernardino and San Diego counties; in Baja California it is restricted to Sierra Juárez and Sierra San Pedro Mártir.

The chromosome number 2n = 14, reported by R. C. Rollins (1993) and by R. E. Buck et al. (1993), must be an error for n = 14. No other species of Streptanthus or its immediate generic relatives has such a low number.

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

Of conservation concern.

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

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

Source FNA vol. 7, p. 705. FNA vol. 7, p. 705.
Parent taxa Brassicaceae > tribe Thelypodieae > Streptanthus Brassicaceae > tribe Thelypodieae > Streptanthus
Sibling taxa
S. barbatus, S. barbiger, S. batrachopus, 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. 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
Synonyms Agianthus bernardinus, Agianthus jacobaeus, S. campestris var. bernardinus, S. campestris var. jacobaeus
Name authority (Greene) Parish: Pl. World 20: 216. (1917) J. L. Morrison: Madroño 4: 204, plate 31, figs. 20–28. (1938)
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