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Mt. Tamalpais jewelflower, Tamalpais jewel flower

Habit Annuals; (glaucous), glabrous throughout.
Stems

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

Basal leaves

(soon withered);

not rosulate; shortly petiolate;

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

Cauline leaves

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

Racemes

ebracteate (lax, sometimes secund).

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.

Fruiting pedicels

divaricate-ascending, 1–2.5(–4) 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.

Seeds

oblong, 1.3–2 × 0.8–1.2 mm;

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

2n

= 28.

Streptanthus batrachopus

Phenology Flowering May–Jun.
Habitat Serpentine barrens and outcrops in chaparral
Elevation 100-600 m (300-2000 ft)
Distribution
from FNA
CA
[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.)

Source FNA vol. 7, p. 705.
Parent taxa 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
Name authority J. L. Morrison: Madroño 4: 204, plate 31, figs. 20–28. (1938)
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