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Constance's bittercress

Habit Perennials; glabrous or sparsely hirsute. Perennials; usually glabrous throughout, rarely pilose.
Rhizomes

cylindrical, slender, to 2 mm diam.

cylindrical, slender, 0.7–1.5 mm diam.

Stems

erect, unbranched, 1.5–5 dm, glabrous or sparsely hirsute basally.

erect or ascending, unbranched, 0.5–2(–2.5) dm.

Rhizomal leaves

absent.

pinnately 5- or 7-foliolate, 2.5–12 cm (not fleshy), leaflets petiolulate;

petiole 1.5–4(–9) cm;

lateral leaflets similar to terminal, or smaller and margins usually toothed, rarely entire;

terminal leaflet (petiolule 0.15–0.3 cm) blade suborbicular to broadly obovate, 0.4–1.5 cm × 2.5–14 mm, base obtuse to subcordate, margins 3–5-toothed, (apiculate).

Cauline leaves

4–7, simple, (crowded distally), petiolate;

petiole (0.5–)1–4(–5) cm, base not auriculate;

blade usually broadly ovate or ovate-lanceolate to ovate-elliptic, rarely obovate, 5–13 cm × 20–65 mm, base cuneate, margins coarsely serrate (with apiculae), or repand to undulate (margins minutely pubescent, apex acute).

1–3, (3–)5-foliolate (alternate), petiolate, leaflets petiolulate or subsessile;

petiole 0.2–2(–6.5) cm, base not auriculate;

lateral leaflets similar to terminal;

terminal leaflet subsessile or petiolulate (to 0.2 cm), blade obovate to oblanceolate, 0.5–1.5 cm × 3–10 mm, base cuneate, margins 3-toothed or entire.

Racemes

ebracteate.

ebracteate.

Flowers

sepals oblong, 6–8 × 2–2.5 mm, lateral pair slightly saccate basally;

petals pink, oblanceolate, 15–28 × 5–8 mm, (claw to 10 mm, apex rounded);

filaments: median pairs 8–10 mm, lateral pair 4–6 mm;

anthers linear, 2–3 mm.

sepals oblong, 2–3.5 × 2–2.5 mm, lateral pair slightly saccate basally;

petals white, broadly obovate, 7–10 × 3–6 mm (clawed, apex rounded);

filaments: median pairs 3–4 mm, lateral pair 2–3 mm;

anthers oblong, 1–1.5 mm.

Fruiting pedicels

divaricate-ascending to suberect, 10–22 mm.

erect to ascending, 0.7–22 mm.

Fruits

linear, 2.5–3.5(–5) cm × 1.9–2.1 mm;

ovules 12–16 per ovary;

style 2–3.5 mm.

linear, 1.6–4 cm × 1–1.3 mm;

ovules 14–24 per ovary;

style 0.7–3 mm.

Seeds

brown, oblong, 2–2.5 × 1.2–1.5 mm.

brown, oblong, ca. 1.5 × 1 mm.

2n

= 28, 42.

Cardamine constancei

Cardamine blaisdellii

Phenology Flowering May–Jun. Flowering Jul–Aug.
Habitat Moist cliffs, wooded creek bottoms, shaded draws, hillsides, moist woods, mixed coniferous forests, granitic soils Moist streamsides, meadows, river gravel, mesic grounds, wet tundra, moist humus, scree slopes, calcareous fellfields
Elevation 400-600 m (1300-2000 ft) 50-1000 m (200-3300 ft)
Distribution
from FNA
ID
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; n Europe; e Europe (Russian Far East, Siberia)
[BONAP county map]
Discussion

Cardamine constancei is known from Clearwater, Idaho, Kootenai, Nez Perce, and Shoshone counties.

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

Cardamine blaisdellii was treated by R. C. Rollins (1993) as a synonym of C. microphylla, but the morphological differences (see key) and molecular data (R. B. Jørgensen et al., 2008) clearly demonstrate that they are distinct.

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

Source FNA vol. 7, p. 471. FNA vol. 7, p. 468.
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. 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. pachystigma, 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. 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. pachystigma, C. parviflora, C. pattersonii, C. penduliflora, C. pensylvanica, C. pratensis, C. purpurea, C. rotundifolia, C. rupicola, C. umbellata
Synonyms C. microphylla subsp. blaisdellii, C. microphylla var. blaisdellii
Name authority Detling: Madroño 3: 176, plate 9. (1935) Eastwood: Bot. Gaz. 33: 146. (1902)
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