Prenanthes trifoliolata (Cassini) Fernald (Q6260)

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Prenanthes trifoliolata is a synonym of Nabalus trifoliolatus Cassini
Language Label Description Also known as
English
Prenanthes trifoliolata (Cassini) Fernald
Prenanthes trifoliolata is a synonym of Nabalus trifoliolatus Cassini

    Statements

    taxon/id/Prenanthes trifoliolata (Cassini) Fernald
    0 references
    taxon synonym
    Prenanthes trifoliolata
    Threeleaved rattlesnakeroot (English)
    prenanthe trifoliolée (English)
    Flowering Aug–Oct.
    moist oak-hickory woods
    swampy thickets
    sandy areas
    cliffs
    saline habitats
    St. Pierre and Miquelon
    Plants 10–150 cm;
    taproots thick, with lateral roots.
    Stems erect, green or sometimes mottled purple, usually glabrous, sometimes tomentulose distally.
    Leaves: proximal usually present at flowering;
    petiolate (petioles winged, 1–25 cm);
    blades deltate to ovate, 3–12 × 1–15 cm, thin, bases cordate to rounded, margins palmately 3 (–5) -lobed to divided (then leaves compound), lobes and sinuses usually angular (not rounded), lobes short and lanceolate, ultimate margins irregularly serrate, faces glabrous or ciliate along abaxial veins and margins;
    distal reduced, palmately lobed or entire.
    Heads (2–7, nodding, in irregular clusters) in racemiform or paniculiform arrays.
    Involucres narrowly campanulate (bases attenuate to bracteate peduncles), 10–13 × 4–5 mm.
    Calyculi of 5–7, green to dark green or blackish, triangular bractlets 1–3 mm, glabrous.
    Phyllaries 7–10, green to dark green or blackish proximally, lanceolate to elliptic, 10–11 mm, margins scarious, sometimes ciliate, faces glabrous.
    corollas pale-yellow, 9–15 mm.
    Cypselae tan to brown, subcylindric, subterete to angled, 4–5 mm, distinctly 8–11-ribbed;
    pappi pale-yellow, 7–9 mm. 2n = 16.