Prenanthes racemosa Michaux (Q6253)

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Prenanthes racemosa is a synonym of Nabalus racemosus (Michaux) Hooker
Language Label Description Also known as
English
Prenanthes racemosa Michaux
Prenanthes racemosa is a synonym of Nabalus racemosus (Michaux) Hooker

    Statements

    taxon/id/Prenanthes racemosa Michaux
    0 references
    taxon synonym
    Glaucous or purple rattlesnakeroot (English)
    glaucous white lettuce (English)
    prenanthe à grappe (English)
    Flowering Aug–Sep.
    sandy alluvial soils
    stream banks
    wet meadows
    tall-grass prairies
    marshy flats
    calcicolous
    Plants 30–175 cm;
    taproots fusiform, tuberous.
    Stems erect, green or light purple, simple, (stout), glabrous and glaucous proximally, setose or hispid distally.
    Leaves: proximal usually present at flowering;
    petioles broadly winged, (1–15 cm);
    blades broadly oblanceolate to spatulate, 4–25 × 1–8 cm, coriaceous, bases attenuate, clasping, margins entire or weakly denticulate, apices obtuse or rounded, faces glabrous;
    mid cauline sessile, clasping;
    distal sessile and reduced.
    Heads (ascending) in (elongate) narrowly racemiform or paniculiform arrays.
    Involucres campanulate, 11–12 × 4–7 mm.
    Calyculi of 8, dark green to purple, narrowly triangular-subulate bractlets 2–4 mm, coarsely setose.
    Phyllaries 7–14, green to purple, lanceolate to linear, 10–12 mm, margins scarious, sparsely to densely setose.
    corollas usually pinkish, sometimes white or lavender, 7–13 mm.
    Cypselae golden brown, subcylindric, subterete, 5–6 mm, indistinctly 8–12-ribbed;
    pappi pale-yellow, 6–7 mm. 2n = 16.