Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Alta., B.C., Yukon; Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.
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Physical Description

Morphology

Description

Stems leafless or with 1 leaf, erect. Basal leaves: blade oblong-ovate to orbiculate-reniform, largest 1.5-11.5(-15) × 1-13cm, margins entire or crenate to dentate. Inflorescences 1-2(-4)-flowered. Flowers 15-40 mm diam.; sepals white to yellow (abaxially bluish), 8.5-23 mm. Follicles 4-15, spreading, short-stipitate or sessile, linear-oblong; bodies 10-20 × 3-4.5 mm; style and stigma straight or curved, 0.5-1.8 mm. Seeds elliptic, 1.9-2.5 mm. 2 n =48,96.
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Diagnostic Description

Synonym

Caltha biflora de Candolle; C. biflora subsp. howellii (Huth) Abrams; C. biflora var. rotundifolia (Huth) C. L. Hitchcock; C. howellii (Huth) Greene; C. leptosepala var. rotundifolia Huth; C.leptosepala var. sulfurea C. L. Hitchcock; C. uniflora Rydberg; Psychropila leptosepala (de Candolle) W. Weber
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Type Information

Isotype for Caltha leptosepala var. sulfurea C.L. Hitchc.
Catalog Number: US 1923334
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): A. S. Hitchcock & C. Muhlick
Year Collected: 1944
Locality: Mount Borah, Rock Creek., Custer, Idaho, United States, North America
  • Isotype: Hitchcock, A. S. 1964. Vasc. Pl. Pacific N.W. 2: 337.
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Ecology

Habitat

Open, wet, subalpine and alpine marshes, wet seepages; 750-3900m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

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

Molecular Biology

Statistics of barcoding coverage: Caltha leptosepala

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: T2 - Imperiled

Reasons: Kartesz (1999) reports that Caltha leptosepala var. sulfurea occurs in Montana and Idaho; Hitchcock and Cronquist (1974) recognized it as an endemic known from one mountain range in Idaho.

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National NatureServe Conservation Status

Canada

Rounded National Status Rank: N4 - Apparently Secure

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Caltha leptosepala

Caltha leptosepala (White Marsh Marigold, Twinflowered Marsh Marigold, or Broadleaved Marsh Marigold) is a species of flowering plant in the buttercup family. It is native to western North America from Alaska to New Mexico, where it grows in wet mountain habitats in alpine and subalpine regions. There are two general wild types of this species, one native to the interior and one that grows along the Pacific coast and coastal mountains, but these are not always treated separately.[1]

Caltha leptosepala subsp. howellii

This is a perennial herb growing a mostly naked stem with leaves located basally. The leaves are up to 13 or 15 centimeters long and may have smooth, wrinkled, or toothed edges. The inflorescence bears one or more flowers. Each flower is 1 to 4 centimeters wide and lacks petals, having instead petallike sepals which are usually white or sometimes yellow. In the center are many long, flat stamens and fewer pistils.

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Notes

Comments

Caltha leptosepala is morphologically complex, and a number of segregate taxa have been described. Plants are most commonly assigned to two species, however. Caltha leptosepala in strict sense is found in the Rocky Mountains of Arizona and New Mexico north to Alaska and is characterized by longer-than-broad leaves with small, nonoverlapping basal lobes, solitary-flowered inflorescences, and sessile follicles. Plants in the Coast Ranges of central California north to the coastal islands of southern Alaska, distinguished by broader-than-long leaves with large, overlapping basal lobes, 2-flowered inflorescences, and stipitate follicles, have been called C . biflora . My comparison of specimens from the Rocky Mountains and the Coast Ranges indicated that no clear distinction could be made (table 1). While plants are often distinctive in the southern part of their range, a continuous intergradation between the two extremes exists over much of their range. 

 Table 1. Morphologic comparison of Caltha leptosepala from the Rocky Mountains and Coast Ranges. Rocky Mountains * Coast Ranges **

C . leptosepala C . bicolor

in strict sense in strict sense

---------------------

Leaf (L:W ratio) 0.8-2.2(-3.1) 0.4-1.5

Flower number 2-4 1-4

Stipe (mm) 0-3.2 0-2.7 *Including Alaska, Arizona, Colorado, Idaho, and Montana.

**Including British Columbia, California, Oregon, and Washington.

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Names and Taxonomy

Taxonomy

Comments: Referenced in Kartesz 1999 as Caltha leptosepala spp. leptosepala var. sulfurea.

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