Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Known from Franklin County in northwestern Alabama, Jackson County in southwestern Illinois, Logan and Warren Counties in southcentral Kentucky, seven counties in the Nashville Basin in central Tennessee and in Carroll County in the western Highland Rim in Tennessee (Medley, 1980 and Baskin, 1983).

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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National Distribution

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Ecology

Habitat

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Associations

Flower-Visiting Insects of Marbleseed in Illinois

Onosmodium molle (Marbleseed)
(Short-tongued bees probably collect pollen, other insects probably seek nectar; all observations are from Williams)

Bees (long-tongued)
Apidae (Apinae): Apis mellifera; Apidae (Bombini): Bombus affinis, Bombus bimaculatus, Bombus fervidus, Bombus griseocallis, Bombus impatiens, Bombus vagans

Bees (short-tongued)
Halictidae (Halictinae): Augochlorella striata, Augochloropsis metallica metallica, Lasioglossum admirandus

Ants
Formicidae: Unidentified species

Skippers
Hesperiidae: Epargyreus clarus

Beetles
Cleridae: Phyllobaenus pubescens

Plant Bugs
Miridae: Adelphocoris lineolatus, Plagiognathus obscurus, Plagiognathus politus, Rhinocapsus vanduzeei

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 21 - 80

Comments: Known from at least twenty-five to fifty occurrences in Tennessee, and two historical Alabama occurrences, one historical Illinois occurrence, and two historical Kentucky occurrences (Medley, 1980).

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: T3 - Vulnerable

Reasons: Onosmodium molle ssp. molle is known from Alabama, Illinois, Kentucky, and Tennessee. Although very rare and perhaps extirpated in Alabama, Illinois, and Kentucky, it is abundant (at least twenty-five to fifty extant occurrences) in its cedar glade habitat in the Nashville Basin of central Tennessee. Development is a threat, but usually only if its habitat is completely destroyed; O. molle ssp. molle is a hardy taxon and seems to thrive in disturbed areas.

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National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: T3 - Vulnerable

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National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: N4 - Apparently Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

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Global Short Term Trend: Relatively stable (=10% change)

Comments: In 1980, Medley reported that its habitat, cedar glades, were being destroyed rapidly throughout this taxon's range. However, Onosmodium molle ssp. molle is a hardy species and often thrives in disturbed areas.

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Threats

Comments: Threats to this habitat primarily result from ORV use and some weedy competition (limiting ORV use has proven effective in maintaining populations). Other threats include: overgrazing, dumping, natural succession, and loss of land to development. Habitat stability affected by nutrient and/or hydrological changes (i.e. agricultural run-off, hydrological alteration from road-building).

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Wikipedia

Lithospermum molle

Lithospermum molle, the softhair marbleseed, is a species of flowering plant in the forget-me-not family. This species is a narrow endemic, native primarily to the Nashville Basin of Tennessee, where it is found in limestone prairies near cedar glades. There are disjunct populations in similar habitats in the Ozark Mountains of Missouri, in northwest Alabama, in Logan and Warren County, Kentucky as well as other small areas of Tennessee. [2] Outside of Tennessee, it is very rare and perhaps no longer exists in Alabama and Kentucky due to habitat destruction. Because of its highly restricted geographic range, this species is considered vulnerable. [1]

This species has been long confused with Lithospermum bejariense, Lithospermum parviflorum, and Lithospermum virginianum, and its true geographic range and morphological distinctiveness are only recently being clarified. [3]

References[edit]

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Names and Taxonomy

Taxonomy

Comments: As treated here, Onosmodium molle includes plants sometimes placed in separate species; in that case, the present "ssp. molle" is the species O. molle taken in the strict sense.

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Comments: Following Kartesz (1994 checklist), treated broadly here, including plants sometimes placed in the separate species Onosmodium bejariense, O. hispidissimum, and O. subsetosum.

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