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Published In: Transactions of the New York Academy of Sciences 9(1–2): 8. 1889. (Trans. New York Acad. Sci.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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4. Cardamine douglassii (Torr.) Britton (purple cress, northern bitter cress)

C. bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb. var. purpurea (Torr.) Britton, Sterns & Poggenb.

Pl. 316 a, b; Map 1334

Plants perennial herbs with short, tuberous, unsegmented rhizomes. Stems (7–)10–30 cm long, with spreading hairs (0.2–)0.3–0.6(–0.8) mm long, especially in the apical half. Leaves 2–7 cm long, simple, entire, wavy-margined, or with few, shallow, widely spaced teeth, often sparsely hairy; the basal leaves usually withered by flowering time, long-petiolate, the leaf blades ovate to cordate; the stem leaves mostly 3–5, mostly sessile, ovate to lanceolate or narrowly elliptic. Sepals (2.5–)3.0–6.0 mm long, reddish purple. Petals (7–)8–14 mm long, pink to purplish pink. Styles 3–4 mm long. Fruits (15–)25–40 mm long, sometimes aborting before maturity. Seeds 1.7–2.1 mm long, irregularly oblong to circular in outline, the surface slightly roughened, orange to greenish yellow. 2n=64, 96, 144. March–April.

Scattered in northeastern Missouri (eastern U.S. and adjacent Canada west to Minnesota, and Missouri). Mesic to wet bottomland forests.

For a discussion of the separation between this species and the closely related C. bulbosa, see the treatment of that species.



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