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limestone bittercress, pink bitter-cress

Constance's bittercress

Habit Perennials; hirsute throughout or glabrous proximally. Perennials; glabrous or sparsely hirsute.
Rhizomes

(tuberous at stem base), subglobose, (lobed or not), (3–)4–10 mm diam., (fleshy).

cylindrical, slender, to 2 mm diam.

Stems

erect, unbranched, (0.7–)1–2.5(–3) dm, sparsely to densely hirsute, or glabrous basally, (trichomes (0.2–)0.3–0.6(–0.8) mm).

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

Rhizomal leaves

simple, (3–)5–15(–18) cm;

petiole (2–)4–12(–16) cm;

blade often orbicular to cordate, sometimes reniform or ovate, (1–)2–6 cm × (7–)17–50 mm, base obtuse to cordate, margins repand or entire.

absent.

Cauline leaves

3–6(–8), simple, petiolate or sessile; (middle) shortly petiolate or (distal) sessile, base not auriculate;

blade oblong to ovate or lanceolate, 2–5 cm × 5–25 mm, margins entire, repand, or coarsely dentate.

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).

Racemes

ebracteate.

ebracteate.

Flowers

sepals oblong, 2.5–4(–6) × 1.5–2.5 mm, lateral pair not saccate basally, (surfaces often hirsute);

petals usually rose-purple to pink, rarely white, obovate, (7–)8–13(–15) × 3–5 mm, (short-clawed, apex rounded);

filaments: median pairs 4–7 mm, lateral pair 2–4 mm;

anthers oblong, 1.3–1.7 mm.

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.

Fruiting pedicels

ascending to divaricate, (10–)15–35(–50) mm, sparsely pubescent or glabrous.

divaricate-ascending to suberect, 10–22 mm.

Fruits

linear, (1.5–)2–4 cm × 1.5–2 mm;

ovules 10–16 per ovary;

style 2–5 mm.

linear, 2.5–3.5(–5) cm × 1.9–2.1 mm;

ovules 12–16 per ovary;

style 2–3.5 mm.

Seeds

brown, oblong to ovoid, 1.7–2.5 × 1–5 mm.

brown, oblong, 2–2.5 × 1.2–1.5 mm.

2n

= 56, 64, 96, 112, 144.

Cardamine douglassii

Cardamine constancei

Phenology Flowering Mar–May. Flowering May–Jun.
Habitat Rich woods, bluffs, mesic bottomland forests, rocky hillsides, floodplains, seepage of bogs, springy areas Moist cliffs, wooded creek bottoms, shaded draws, hillsides, moist woods, mixed coniferous forests, granitic soils
Elevation 50-400 m (200-1300 ft) 400-600 m (1300-2000 ft)
Distribution
from FNA
AL; CT; DC; IA; IL; IN; KY; MA; MD; MI; MN; MO; NC; NJ; NY; OH; PA; SC; TN; VA; WI; WV; ON
[WildflowerSearch map]
[BONAP county map]
from FNA
ID
[WildflowerSearch map]
[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.)

Source FNA vol. 7, p. 473. FNA vol. 7, p. 471.
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. 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. 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
Synonyms Arabis rhomboidea var. purpurea, Dentaria douglassii, Dracamine purpurea, Thlaspi tuberosum
Name authority Britton: Trans. New York Acad. Sci. 9: 8. (1889) Detling: Madroño 3: 176, plate 9. (1935)
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