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rock toothwort, serpentine bittercress

hairy bitter-cress, shotweed

Habit Perennials; glabrous. Annuals; sparsely hirsute basally (at least on petiole of basal leaves), often glabrous distally.
Rhizomes

ovoid to oblong, (3–)4–18 mm diam., (fleshy, deeply underground).

absent.

Stems

erect, unbranched, 1–3 dm.

erect, ascending, or decumbent, unbranched or branched basally and/or distally, (0.3–)1–3.5(–4.5) dm, (not flexuous).

Basal leaves

(persistent to anthesis), rosulate, (5–)8–15(–22)-foliolate, (2–)3.5–15(–17) cm, leaflets petiolulate;

petiole 0.5–5 cm, (ciliate);

lateral leaflet blade oblong, ovate, obovate, or orbicular, smaller than terminal, margins entire, repand, crenate, or 3-lobed;

terminal leaflet (petiolule 0.2–1 cm), blade reniform or orbicular, 0.4–2 cm × 6–30 mm, margins entire, repand, dentate, or 3 or 5-lobed.

Rhizomal leaves

simple, 1.2–2.3 cm;

petiole 6.7–19.5 cm;

blade orbicular to reniform, or cordate to broadly ovate, 2.7–5.5 cm × 30–68 mm, base cordate to subtruncate, margins with obtuse teeth terminating in apiculae.

Cauline leaves

2–5, (crowded distally), simple;

petiole 0.3–2.6 cm, base not auriculate;

blade similar to basal, 1.8–5.5 cm × 12–47mm, base cuneate or obtuse to subcordate, marginal teeth apiculate.

1–4(–6), compound as basal, petiolate, [(0.5–)1.2–5.5(–7) cm, including petiole], leaflets petiolulate;

blade base not auriculate;

leaflets similar to basal.

Racemes

ebracteate.

ebracteate.

Flowers

sepals oblong, 4–7 × 2–2.5 mm, lateral pair saccate basally;

petals usually pink or purple, rarely white, obovate to oblanceolate, 14–18 × 5–7 mm, (claw to 9 mm, apex rounded);

filaments: median pairs 7–8 mm, lateral pair 5.5–6.5 mm;

anthers oblong, ca. 1.5 mm.

sepals oblong, 1.5–2.5 × 0.3–0.7 mm, lateral pair not saccate;

petals (sometimes absent) white, spatulate, 2.5–4.5(–5) × 0.5–1.1 mm; (stamens usually 4, lateral pair often absent, rarely 5 or 6);

filaments 1.8–3 mm;

anthers ovate, 0.3–0.5 mm.

Fruiting pedicels

divaricate to ascending, 7–24 mm.

erect to ascending, (2–)3–10(–14) mm.

Fruits

linear, 3.2–5.4 cm × 2.2–4 mm;

ovules 10–14 per ovary;

style 4–7 mm.

linear, (torulose), (0.9–)1.5–2.5(–2.8) cm × (0.8–)1–1.4 mm, (often appressed to rachis);

ovules 14–40 per ovary;

style 0.1–0.6(–1) mm.

Seeds

brown, broadly ovoid, 2–2.8 × 1.8–2.5 mm.

light brown, oblong or subquadrate, 0.9–1.3(–1.5) × 0.6–0.9(–1.1) mm, (narrowly margined).

2n

= 16.

Cardamine pachystigma

Cardamine hirsuta

Phenology Flowering Mar–May. Flowering Feb–Jul.
Habitat Forests, lava slides, talus, cliffs Roadsides, clearings, disturbed sites, slopes, cedar glades, mixed woods, meadows, fields, waste grounds, damp places, grassy areas
Elevation 700-2900 m (2300-9500 ft) 0-700 m (0-2300 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CA; CT; DC; DE; FL; GA; IL; KY; LA; MA; MD; MI; MO; MS; NC; NJ; NY; OH; OK; OR; PA; SC; TN; TX; UT; VA; WA; WV; BC; ON; w Eurasia [Introduced in North America; introduced also in Central America, South America, e Asia (Japan), South Africa, Australia]
[WildflowerSearch map]
[BONAP county map]
Discussion

Cardamine pachystigma is known from the disjunct counties of Plumas, Tehama, and Tulare.

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

Herbarium specimens of Cardamine hirsuta have been misidentified as C. oligosperma.

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

Source FNA vol. 7, p. 480. FNA vol. 7, p. 475.
Parent taxa Brassicaceae > tribe Cardamineae > Cardamine Brassicaceae > tribe Cardamineae > Cardamine
Sibling taxa
C. angulata, C. angustata, C. bellidifolia, C. blaisdellii, C. breweri, C. bulbosa, C. californica, C. clematitis, C. concatenata, C. constancei, C. cordifolia, C. digitata, C. diphylla, C. dissecta, C. douglassii, C. flagellifera, C. flexuosa, C. hirsuta, C. holmgrenii, C. impatiens, C. longii, C. macrocarpa, C. maxima, C. micranthera, C. microphylla, C. nuttallii, C. nymanii, C. occidentalis, C. oligosperma, C. parviflora, C. pattersonii, C. penduliflora, C. pensylvanica, C. pratensis, C. purpurea, C. rotundifolia, C. rupicola, C. umbellata
C. angulata, C. angustata, C. bellidifolia, C. blaisdellii, C. breweri, C. bulbosa, C. californica, C. clematitis, C. concatenata, C. constancei, C. cordifolia, C. digitata, C. diphylla, C. dissecta, C. douglassii, C. flagellifera, C. flexuosa, C. holmgrenii, C. impatiens, C. longii, C. macrocarpa, C. maxima, C. micranthera, C. microphylla, C. nuttallii, C. nymanii, C. occidentalis, C. oligosperma, C. pachystigma, C. parviflora, C. pattersonii, C. penduliflora, C. pensylvanica, C. pratensis, C. purpurea, C. rotundifolia, C. rupicola, C. umbellata
Synonyms Dentaria californica var. pachystigma, C. californica var. pachystigma, Dentaria corymbosa var. grata, Dentaria pachystigma
Name authority (S. Watson) Rollins: Harvard Pap. Bot. 1(4): 45. (1993) Linnaeus: Sp. Pl. 2: 655. (1753)
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