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Holmgren's bitter-cress

purple bittercress

Habit Perennials; glabrous throughout. Perennials; (often cespitose); hirsute.
Rhizomes

slender, 0.5–1 mm diam.

vertical, 1–3 mm diam., (not fleshy).

Stems

erect to ascending, branched, 1.5–2 dm.

(simple or few to several from base), usually erect, unbranched, (0.3–)0.5–1.2(–1.5) dm.

Basal leaves

sometimes rosulate, usually 3 or 5-foliolate, rarely simple, (1.5–)2.5–7 cm, leaflets petiolulate or sessile;

petiole (1.2–)2–5 cm;

lateral lobes or leaflets sessile, blade similar to terminal, distinctly smaller;

terminal lobe or leaflet petiolulate (0.05–0.6 cm), blade reniform or suborbicular to broadly ovate, 0.3–1 cm × 4–15 mm, base subcordate to rounded, margins entire, repand, or obscurely 2-toothed.

Cauline leaves

3 or 4, 3- or 5-foliolate, petiolate, leaflets petiolulate;

petiole 0.5–1.7 cm, base not auriculate;

lateral leaflet blade linear to linear-lanceolate, 0.9–1.5 cm × 1–3 mm, margins entire;

terminal leaflet (petiolule 0.3–0.5 cm), blade obovate to lanceolate (linear distally), 1.3–2.3 cm × 2–8 mm, base cuneate, margins entire or subapically 1- or 2-toothed.

1–3, usually compound, rarely simple, petiolate, leaflets petiolulate or sessile;

petiole (0.2–)0.5–2 cm, base not auriculate;

similar to basal, smaller.

Racemes

ebracteate.

ebracteate.

Flowers

sepals oblong, 1.2–1.5 × 0.6–0.8 mm, lateral pair not saccate basally;

petals white, oblanceolate, 2–2.5 × 0.8–1 mm, (not clawed, apex rounded);

filaments: median pairs 1.5–1.8 mm, lateral pair 1–1.2 mm;

anthers ovate, 0.2–0.3 mm.

sepals oblong, 2–3(–4) × 1.4–1.7 mm, lateral pair not saccate basally;

petals usually purple to pink, rarely white, obovate, 5–7(–9) × 3–4(–5) mm, (clawed, apex rounded);

filaments: median pairs 2.5–3.5 mm, lateral pair 1.5–3.5 mm;

anthers oblong, 0.6–0.9 mm.

Fruiting pedicels

ascending to suberect, 5–14 mm.

suberect, ascending, or divaricate, 5–12 mm, pubescent.

Fruits

linear, 1–2 cm × ca. 1 mm;

ovules 16–24 per ovary;

style 0.5–0.7 mm.

linear, 1.5–2.5 cm × 1.5–1.8 mm;

ovules 10–14 per ovary;

style 1–2.5 mm.

Seeds

brown, oblong, 1.2–1.5 × 0.8–1 mm.

brown, oblong to broadly ovoid, 1.7–2.1 × 1.4–1.7 mm.

Rhizomal

and basal leaves absent.

2n

= 96.

Cardamine holmgrenii

Cardamine purpurea

Phenology Flowering Jul–Aug. Flowering Jun–Aug.
Habitat Boggy slopes Moist tundra, damp woods and ravines, alpine turf, river flats, peaty subarctic meadows, streamsides, moist slopes
Elevation 600-1800 m (2000-5900 ft)
Distribution
from FNA
OR
[BONAP county map]
from FNA
AK; YT; e Asia (Russian Far East)
[BONAP county map]
Discussion

Cardamine holmgrenii is known only from the type collection, from the Blue Mountains in Baker County.

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

Source FNA vol. 7, p. 475. FNA vol. 7, p. 483.
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. 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. 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. pachystigma, C. parviflora, C. pattersonii, C. penduliflora, C. pensylvanica, C. pratensis, C. rotundifolia, C. rupicola, C. umbellata
Synonyms C. purpurea var. albiflora, C. purpurea var. albiflos, C. purpurea var. lactiflora
Name authority Al-Shehbaz: Harvard Pap. Bot. 11: 275. (2007) Chamisso & Schlechtendal: Linnaea 1: 20. (1826)
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