Lomatogonium rotatum - (L.) Fries ex Fern.
Marsh Felwort
Other Common Names: marsh felwort
Synonym(s): Lomatogonium rotatum ssp. rotatum
Taxonomic Status: Accepted
Related ITIS Name(s): Lomatogonium rotatum (L.) Fries ex Fern. (TSN 29992)
Unique Identifier: ELEMENT_GLOBAL.2.127992
Element Code: PDGEN0C010
Informal Taxonomy: Plants, Vascular - Flowering Plants - Gentian Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Gentianales Gentianaceae Lomatogonium
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Lomatogonium rotatum
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 15Jul2016
Global Status Last Changed: 07Jun1984
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Reasons: Widespread and locally abundant circumboreal species, rare at southern edges of range (e.g., Maine).
Nation: United States
National Status: N4N5
Nation: Canada
National Status: N5? (07Jun1995)

U.S. & Canada State/Province Status
United States Alaska (SNR), Colorado (SNR), Idaho (S1), Maine (S1), Montana (S1S2), New Mexico (SNR), Utah (S1S2), Wyoming (S2)
Canada Alberta (S2S3), British Columbia (S2S3), Labrador (S3), Manitoba (S2S3), New Brunswick (S1), Newfoundland Island (S2S3), Northwest Territories (SNR), Nunavut (SU), Ontario (S4S5), Quebec (S3S4), Saskatchewan (S2), Yukon Territory (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Greenland to Alaska, south to Colorado.

Number of Occurrences: 6 - 20
Number of Occurrences Comments: No clear estimates of its population level are known. It has been recorded (Table 1) on 8 islands in the Great Wass Island Archipelago plus one island off Schoodic Point (Little Moose Island) (Olday et al. 1982) and on Schoodic Point itself (Stebbins 1928). There are at least three distinct populations on Great Wass Island, three on Outer Sand Island, and five on Inner Water Island. Table 1 gives the names of all current and historic locations for LOMATOGONIUM in Maine. All of these locations have extant populations except for Schoodic Point, and were visited in 1982 (two islands) and 1983 (seven islands).

Overall Threat Impact Comments: Lomatogonium rotatum grows where hikers, beachcombers, and nature lovers are likely to walk. At this time, other threats such as animal predation, loss of habitat through succession, or displacement by other plants do not appear to be important to LOMATOGONIUM on Great Wass Island, Crumple Is. and Mistake Is. (all in ME; TNC owned islands). It is unlikely that these factors are adversely affecting the other known LOMATOGONIUM locations. The population at Schoodic Point, ME, whose status is unknown, would be the most susceptible to trampling or picking as it is (was?) located in a high use area of Acadia National Park.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Greenland to Alaska, south to Colorado.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AK, CO, ID, ME, MT, NM, UT, WY
Canada AB, BC, LB, MB, NB, NF, NT, NU, ON, QC, SK, YT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
ID Clark (16033), Custer (16037), Lemhi (16059)
ME Hancock (23009), Washington (23029)
MT Beaverhead (30001)
WY Albany (56001), Carbon (56007)*, Laramie (56021)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
01 Maine Coastal (01050002)+
10 Red Rock (10020001)+, Upper North Platte (10180002)+*, Upper Laramie (10180010)+, Cache La Poudre (10190007)+, Lone Tree-Owl (10190008)+, Crow (10190009)+
17 Birch (17040216)+, Little Lost (17040217)+, Big Lost (17040218)+, Lemhi (17060204)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: This species is a small annual or biennial herb with an erect, branched or unbranched stem.
General Description: Felwort is a glabrous annual with usually unbranched stems that are 5-15 cm high. The opposite leaves are narrowly oblong to lance-shaped and 1-3 cm long. White or bluish flowers are borne on slender, 1-3 cm long stalks which arise from the axils of the upper leaves. The 5 spreading, lance-shaped petals are 6-15 mm long and are united at the base and subtended by slightly longer, narrow, green sepals. Each petal has 2 small appendages at the base, and there are 5 stamens. The fruit is a many-seeded, egg-shaped capsule that is as long as the petals.
Technical Description: Lomatogonium rotatum has an erect, branched or unbranched stem, 0.3 to 2.5 dm tall, and strongly ascending capillary branches. The leaves are opposite entire, slightly fleshy; the lower ones spatulate and the middle and upper linear-lanceolate, sharp pointed, and 0.4 to 3 cm long. The flowers are borne singly at the tops of branches or the axils of leaves. The sepals number 2-5 and are similar to the median leaves, nearly equalling to much exceeding the corolla. They are conspicuous features both in flower and fruit. The corolla is rotate, porcelain-blue and relatively conspicuous. Each petal is sharp pointed, ranges between 0.5-1.5 cm long, and has at its base pairs of distinctive scale-like, fringed nectar producing appendages.
 
The stamens are borne on the short corolla tube. The stigmatic surface is decurrent along the sides of the narrowly egg shaped ovary. The fruit is an oblong capsule (0.5 to 1.7 cm) somewhat acute, which contains numerous small seeds. Lomatogonium flowers in Maine from mid-August to late September and early October.

Diagnostic Characteristics: SWERTIA PERENNIS has similar flowers but is a perennial. Annual gentians have tubular rather than star-shaped corollas. This plant is often overlooked because it blooms in August.
Duration: ANNUAL, BIENNIAL
Reproduction Comments: Little is known about the reproductive biology of this species. Floristic manuals indicate that this is an annual or biennial. Longer term studies are needed to determine its duration. The pollinators are unknown. Syrphid flies, bumblebees, and several species of butterflies are present in or near their populations, and a syrphid fly was seen visiting LOMATOGONIUM in late September on Water Island (Inner Water Island). It is likely that nectar is the reward for pollinators, although we did not verify the presence of nectar. It appears that this species is reproducing succesfully by seed. Many reproductively mature plants were observed as well as reproductively immature, non-flowering individuals. It is also unknown how the seeds are dispersed. Because of its short stature migratory songbirds, esp. Fringillids, may be involved with seed dispersal and/or seed predation.
Ecology Comments: Lomatogonium rotatum's distribution in Maine is restricted to the moist maritime zone along the coast of eastern Maine (Famous and Campbell 1984). Compared to inland and coastal sections farther west summer temperatures are cooler, the incidence of fog is higher, rainfall and fog-drip rates are higher, and evaporation rates are lower, providing an abundance of water. These conditions are not as extreme when Lomatogonium rotatum is in full bloom in August and September.
Estuarine Habitat(s): Herbaceous wetland
Palustrine Habitat(s): Bog/fen, HERBACEOUS WETLAND
Habitat Comments: The more salient features of the habitat of LOMATOGONIUM ROTATUM include moist soils, full sunlight, minimal competition, and, in eastern North America, close proximity to the sea along outer islands and headlands. Hence it most characteristically grows in thin soils bordering headlands or ledges or in pockets of sandy or gravelly soil. A soil test from Red Head on Great Wass Island, performed by the Maine Soil Testing Lab, indicates circumneutral pH and an excessive level of calcium. It is frequently found in seepage areas between boulders and in turf surrounding temporary and permanent brackish and freshwater pools, and in moist rock crevices. It generally does not colonize crevices close to the breaking surf.

Associated species of LOMATOGONIUM ROTATUM in Maine include: AGROSTIS STOLONIFERA, ASTER NOVI-BELGII, A. NEMORALIS, CAMPANULA ROTUNDIFOLIA, CAREX CANESCENS, C. VIRIDULA, DESCHAMPSIA FLEXUOSA, EMPETRUM NIGRUM, EUPHRASIA CANADENSIS, E. RANDII, FESTUCA RUBRA, IRIS HOOKERI, JUNCUS FILIFORMIS, PLANTAGO JUNCOIDES VAR. DECIPIENS, PRENANTHES TRIFOLIATA, PRIMULA LAURENTIANA, SAGINA NODOSA SSP. BOREALIS, SOLIDAGO BICOLOR, TRIGLOCHIN MARITIMA, and VIOLA SEPTENTRIONALIS.

Economic Attributes Not yet assessed
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Management Summary
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Stewardship Overview: Studies on the distribution and abundance of LOMATOGONIUM ROTATUM in eastern Maine, and its reproductive biology, and demographic studies of populations on selected locations in Maine could be very informative about the factors controlling the distribution and abundance of these species. However, in view of the apparent size and stability of the populations in eastern Maine and low level of threat, stewardship needs are minimal.
Restoration Potential: Not enough is known about germination requirements or the soil needs of seedlings to predict how population size would respond to soil changes associated with human trampling.
Preserve Selection & Design Considerations: The Nature Conservancy might prevent the building of trails to certain parts of Great Wass Island (e.g., the headland located on the southwest corner of the Pond or to Red Head).
Management Requirements: It is our opinion that LOMATOGONIUM ROTATUM occupies vegetationally stable habitats in eastern Maine and that short-term reductions in population size are most likely to result from human activity like trampling and development.
Monitoring Requirements: Before establishing a biological monitoring program, the distribution and abundance of LOMATOGONIUM ROTATUM in Maine needs to be established. Because we doubled the known stations of this species in Maine by visiting 10 islands in the proper season (two of which were known to have LOMATOGONIUM), it is likely that there are many more locations to be discovered in eastern Maine. Most outer islands large enough to support vegetation are good candidates for LOMATOGONIUM.

For known populations, detailed, long-term demographic studies, including all age classes, might be the best monitoring system to show how LOMATOGONIUM ROTATUM population size varies. It would be most efficient to study a limited number of populations chosen to cover some parameters like competition, population size and density, proximity to other LOMATOGONIUM populations, and substrate characteristics.

For specific biological monitoring, we recommend establishing several permanently marked 1x1 m plots within populations of LOMATOGONIUM. Some plots could be in areas subject to trampling and others out of the way of human activity. A yearly count of flowering stems would provide a simple estimate of the status of this taxon.

Monitoring Programs: C.S. Campbell, N.C. Famous, C.D. Richards and B.S. Vickery know the locations of some or all of the extant sites in Maine.
Management Research Needs: (1) What is the abundance and distribution of LOMATOGONIUM in eastern Maine? (2) How large are the effective population units? Are larger populations on larger islands a series of discrete small populations such as is seen on Great Wass Island? (3) How do plants respond to trampling? (4) How narrow is the niche of LOMATOGONIUM ROTATUM or how narrowly adapted is it to limited competition and soil characteristics like pH, aeration, and organic content?
Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 13Jul1994
NatureServe Conservation Status Factors Author: N.C. FAMOUS, C.S. CAMPBELL, MEFO (1994); rev. L. Morse, 7/95
Management Information Edition Author: N.C. FAMOUS, C.S. CAMPBELL, MEFO
Element Ecology & Life History Edition Date: 13Jul1994

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Fernald, M. L. 1919. Lomatogonium the correct name for Pleurogyne. Rhodora 21:193-198.

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