Agrimonia pubescens Wallr. - Agrimony

Agrimonia pubescens plant

Family - Rosaceae

Stems - To .75m tall, erect, herbaceous, simple to branching above, from short rhizomes and fibrous roots, densely pubescent with short and long hairs (the longer hairs typically ascending).

Agrimonia pubescens stem

Leaves - Alternate, stipulate, pinnately divided, to +20cm long. Large leaflets oblanceolate to elliptic, coarse serrate, slightly scabrous above, pubescent below, to +/-7cm long, +/-4cm broad. Stipules foliaceous, serrate, to +/-2cm long, +/-1cm broad.

Agrimonia pubescens stipule

Agrimonia pubescens stipuleStipule.

Inflorescence - Terminal spikiform racemes elongating in fruit to +30cm. Each flower subtended by small 3-lobed bract. Bracts and axis of inflorescence pubescent.

Flowers - Petals 5, yellow, 2.5-3mm long, -2mm broad, elliptic. Stamens 10. Filaments glabrous, pale yellow to white, 1.2mm long. Anthers orange, .6mm broad. Styles (and pistils) 2, protruding from center of nectar ring, glabrous, .9mm long. Ovary concealed in hypanthium. Hypanthium turbinate, pubescent, 10-nerved, 1.1mm long(in flower), with ring of uncinate bristles subtending corolla. Bristles to 1mm long. Sepals 5, spreading, acute, 1.5mm long, 1.1mm broad, glabrous or with a few hairs at apex. Fruit an achene within the hypanthium.

Agrimonia pubescens fruitFruit close-up.

Flowering - July - September.

Habitat - Dry rocky woods, ravines, floodbanks, thickets.

Origin - Native to U.S.

Other info. - This is one of the four species of Agrimonia that occur in Missouri. While fruiting, this little plant is likely to be overlooked in the field. The fruits, however, attach to all clothing and will certainly be noticed when you get home. They are a bit of a pain to pull from your apparel. The small flowers are actually quite easy to notice as they add a splash of light to the dark forest floor.

Photographs taken at the Sunklands Conservation Area, Shannon County, MO., 7-29-04.


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