Overview

Distribution

St. Pierre and Miquelon; N.B., Nfld., N.S., Ont., P.E.I., Que.; Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., Miss., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va.
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Physical Description

Morphology

Description

Stems erect, coarse, 50-300 cm. Leaves basal and cauline; basal and proximal cauline leaves petiolate, distal cauline sessile; petioles and rachises frequently pubescent. Leaf blade ternately and pinnately decompound; leaflets light to dark green, cordate or nearly orbiculate to ovate or obovate, apically undivided to 2-3(-5)-lobed or -toothed, 11-68 × 5-70 mm, length 0.8-2.6 times width, membranous to firm, margins scarcely revolute, lobe margins entire, surfaces abaxially pubescent to glabrous. Inflorescences racemes or panicles to corymbs, apically ± rounded, many flowered; peduncles and pedicels often pubescent. Flowers unisexual or bisexual (sometimes bisexual with very few stamens); sepals 4(-6), white to purplish, elliptic-rounded, 2-3.5 mm; filaments ascending, white to purplish, filiform to distinctly clavate, 1.5-7 mm, usually rigid; anthers 0.5-1.5(-2.1) mm, usually blunt or only slightly apiculate. Achenes numerous, sessile to stipitate; stipe 0.5-1.5(-2.4) mm; body ellipsoid, 3-5 mm, prominently veined, usually pubescent; beak usually persistent, straight or coiled distally, 0.6-2.5 mm, about 1/2 length of achene body. 2 n = 126.
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Diagnostic Description

Synonym

Thalictrum carolinianum Bosc ex de Candolle [var.] subpubescens de Candolle; T. polygamum Muhlenberg ex Sprengel; T. polygamum var. hebecarpum Fernald; T. polygamum var. intermedium B. Boivin; T. polygamum var. pubescens (Pursh) K. C. Davis; T. pubescens var. hebecarpum (Fernald) B. Boivin
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Type Information

Lectotype for Thalictrum pubescens Pursh
Catalog Number: US 217129
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): B. L. Robinson & H. v. Schrenk
Year Collected: 1894
Locality: Banks of Rennie's River, St. John's., Newfoundland, Canada, North America
  • Lectotype: Greene, E. L. 1910. Ottawa Naturalist. 24: 52.; Boivin, B. 1944. Rhodora. 46: 478.
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Isotype for Thalictrum perelegans Greene
Catalog Number: US 781646
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): T. H. Kearney
Year Collected: 1897
Locality: Lemon's Gap., Tennessee, United States, North America
  • Isotype: Greene, E. L. 1910. Leafl. Bot. Observ. Crit. 2: 59.
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Holotype for Thalictrum viride Greene
Catalog Number: US 339
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): C. Dubois
Year Collected: 1888
Locality: Waterbury., New Haven, Connecticut, United States, North America
  • Holotype: Greene, E. L. 1910. Leafl. Bot. Observ. Crit. 2: 56.
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Isotype for Thalictrum perelegans Greene
Catalog Number: US 313300
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): T. H. Kearney
Year Collected: 1897
Locality: Near Lemon's Gap., Cocke, Tennessee, United States, North America
  • Isotype: Greene, E. L. 1910. Leafl. Bot. Observ. Crit. 2: 59.
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Ecology

Habitat

Full sun to deep shade, rich woods, low thickets, swamps, wet meadows, and stream banks; 15-1500m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering late spring-summer (mid Jun-early Aug).
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Thalictrum pubescens

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Thalictrum pubescens

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: N5 - Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Thalictrum pubescens

Thalictrum pubescens (tall meadow-rue) is a plant in the buttercup family, Ranunculaceae.

Description[edit]

Thalictrum pubescens is a herbaceous plant with alternate, pinnately compound leaves, on hollow, green stems. The flowers are white, borne in spring and summer.

See also[edit]

References[edit]

  1. ^ Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 121.


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Thalictrum polygamum

Thalictrum polygamum (tall Meadow-rue; also Thalictrum pubescens), is a herbaceous perennial plant native to wet areas in eastern North America. Its common name is from its height — up to 8 feet.

Leaves and flowers[edit]

Taller than other varieties it has plumes of flowers that lack petals. The flowers are described as starry bursts of threadlike stamens. The leaves are divided and subdivided into many roundish three-lobed leaflets. Meadow-rue blooms from July to September. Its height is typically between 3 to 8 feet.[1]

Habitat[edit]

Meadow-rue grows in swamps, and stream sides from Eastern Canada to Indiana. It is also found growing from Long Island to Georgia.[2]

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Notes

Comments

The ovaries change from white to purplish, becoming light green, then darker green, and finally brown as fruits mature. 

 Because of the polymorphic nature of Thalictrum pubescens , a proliferation of names for minor morphologic variants has resulted. Field studies (M. Park 1992) have shown that too much morphologic variation occurs within populations to support the recognition of previously described taxa. Plants in New England and northeastern Canada often have a corymbose inflorescence and longer filaments and achene beaks.

This species is often incorrectly treated in floras as T . polygamum Sprengel, an invalid name.

The Iroquois used Thalictrum pubescens medicinally a a wash for head and neck, to stop nosebleeds, and to treat gall (D. E. Moerman 1986).

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Names and Taxonomy

Taxonomy

Comments: Called Thalictrum polygamum in many older floras; Pursh's name T. pubescens has nomenclatural priority over Muhlenberg's name T. polygamum, and is used by Kartesz (1994 checklist).

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