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Myosotis macrosperma Engelm.
LARGESEED FORGET-ME-NOT
Life   Plantae   Dicotyledoneae   Boraginaceae   Myosotis

Myosotis macrosperma, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, whole plant - in flower - general view

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Myosotis macrosperma, inflorescence - frontal view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, inflorescence - frontal view of flower
Myosotis macrosperma, inflorescence - lateral view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, inflorescence - lateral view of flower

Myosotis macrosperma, leaf - on upper stem
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, leaf - on upper stem
Myosotis macrosperma, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, leaf - basal or on lower stem

Myosotis macrosperma, leaf - margin of upper + lower surface
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, leaf - margin of upper + lower surface
Myosotis macrosperma, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, stem - showing leaf bases

Myosotis macrosperma, fruit - juvenile
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, fruit - juvenile
Myosotis macrosperma, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, stem - showing leaf bases

Myosotis macrosperma, fruit - lateral or general close-up
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, fruit - lateral or general close-up
Myosotis macrosperma, fruit - section or open
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, fruit - section or open

Myosotis macrosperma, seed - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, seed - general view
Myosotis macrosperma, fruit - as borne on the plant
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, fruit - as borne on the plant

Myosotis macrosperma, fruit - lateral or general close-up
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, fruit - lateral or general close-up
Myosotis macrosperma, fruit - as borne on the plant
© Copyright Steve Baskauf, 2002-2011 · 4
Myosotis macrosperma, fruit - as borne on the plant
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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Myosotis macrosperma Engelm. Large-seed Forget-me-not
Boraginaceae — Borage family
Rare native
Myosotis macrosperma
White Clay Creek State Park -- Pump House Road
May 2003

More information on this plant, from other sources.


Copyright David G. Smith

Delaware Wildflowers main page

Following modified from MissouriPlants.com
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Myosotis macrosperma Engelm.

Myosotis macrosperma plant

Family - Boraginaceae

Stems - From a taproot and fibrous roots, multiple from the base, erect, herbaceous, green, hirsute, slightly angled from decurrent leaf tissue, to 50cm tall (in fruit), branching.

Myosotis macrosperma stem

Leaves - Alternate. Basal leaves spatulate, to +/-6cm long, -2cm broad. Cauline leaves sessile, oblong to oblong-lanceolate, to 6cm long, 1.5cm broad. All leaves entire, hirsute, acute to rounded at the apex, green, with a single distinct midrib. Faint lateral venation anastomosing before the leaf margin.

Myosotis macrosperma leaves

Inflorescence - Terminal and lateral scorpoid racemes or cymes, compact in flower, very elongated in fruit. Pedicels short in flower, elongating to 3-4mm long in fruit, lanate. Axis of inflorescence lanate.

Myosotis macrosperma inflorescence Inflorescence...

Myosotis macrosperma inflorescence ...qickly elongating in fruit.

Flowers - Corolla white, funnelform, glabrous, slightly zygomorphic, 3mm broad, 3mm long, 5-lobed. Longest lobes to 1.2mm long, 1mm broad, truncate at apex. Fornices small, included in the throat of the corolla. Stamens 5, adnate above the base of the corolla tube. Filaments minute, -.1mm long. Anthers brownish, .5mm long. Ovary 4-lobed, subtended by a green nectary. Lobes green, glabrous, lenticular, to .3mm in diameter, with a slightly winged margin, expanding to +2mm in diameter in fruit. Style exserted from between ovary lobes, green, .7mm long, glabrous, included. Stigma bilobed. Calyx accrescent, densely uncinate pubescent (hirsute) externally, glabrous internally, 5-lobed, zygomorphic. Lobes attenuate, the longest to 2mm in flower (longer in fruit). Calyx tube to 2mm long in flower, longer in fruit.

Myosotis macrosperma flowers Flowers close-up.

Flowering - April - May.

Habitat - Fallow and cultivated fields, moist to dry woods, slopes, bottoms, roadsides, railroads.

Origin - Native to U.S.

Other info. - This species can be found throughout Missouri. The plant can be identified by its small white flowers, hirsute stems, and elongated inflorescences (in fruit).
Steyermark listed this species as a variety of M. virginica (L.) BSP . More modern taxonomy lumps M. virginica and M. macrosperma into the same species, M. verna Nutt. Regardless of what you call the plant, its annoying fruits will stick to your clothes and hair and are a chore to remove.

Photographs taken off Hwy 29, Guilford County, MO., 4-20-03.


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Following modified from Plants Database, United States Department of Agriculture
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Updated: 2018-01-18 12:39:29 gmt
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