Iodanthus pinnatifidus (Michx.) Steud. - Purple Rocket
Family - Brassicaceae
Stems - To +80cm tall, erect, simple to branching near apex, herbaceous, carinate, glabrous, from large taproot.
Leaves - Alternate, sessile, at least the lowest auriculate and partially clasping, serrate-dentate, glabrous, to 15cm long, +/-4cm broad, spatulate below, lanceolate above, acute to acuminate. The lowest leaves often somewhat pinnatifid.
Inflorescence - Terminal and axillary racemes elongating in fruit to +30cm tall. Pedicels slightly elongating in fruit to 1cm long, tuberculate, typically perpendicular to axis of stem.
Flowers - Petals 4, clawed, light purple to lilac, glabrous. Claw to 8mm long. Limb to +3mm broad, 6-7mm long, truncate or obtuse at apex, spreading or reflexed. Stamens 6, 4 large and 2 small. Filaments glabrous, lilac at apex, whitish near base, to 8mm long. Anthers purple, 1.2mm long. Ovary purple, glabrous, 7mm long, terete. Sepals 4, erect, distinct, lilac below, green and scarious at apex, glabrous, to 6mm long, 2mm broad at base, cupped. Siliques ascending to spreading, to 4cm long, with beak to 2.5mm long.
Flowering - May - June.
Habitat - Moist soils of flood plain forest and low woods.
Origin - Native to U.S.
Other info. - The plant is a textbook member
of the Brassicaceae with 4 distinct petals, 4 distinct
sepals, and 6 distinct stamens.
Photographs taken in the Ozark Scenic Riverways, Shannon County, MO., 5-24-03.