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Saussurea americana

(American Saw-Wort)

Interesting Facts

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Common Names

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Common Names in English:

American Saw-Wort

Description

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Family Compositae

The largest family of flowering plants , the Compositae (Asteraceae), comprising about 1,100 genera and more than 20,000 species and characterized by many small flowers arranged in a head looking like a single flower and subtended by an involucre of bracts. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.

Genus Saussurea

Perennials , 5-120+ cm; herbage tomentose or glabrescent , not spiny . Stems erect or ascending , simple or branched. Leaves basal or cauline (sometimes cauline only), sessile or petiolate ; blade margins entire or dentate to pinnately lobed , faces glabrous to densely tomentose, glandular or eglandular . Heads discoid , borne singly or in corymbiform arrays. Involucres ovoid to campanulate or ± turbinate . Phyllaries many in 3-5(-10+) series, subequal to strongly unequal, appressed or not, ovate to lanceolate, margins entire, toothed , or lobed, apices obtuse or acute, appendaged or not, not spine-tipped. Receptacles flat or convex , epaleate, smooth , usually subulate-scaly, sometimes bristly or naked. Florets 10-20; corollas white to blue or purple, tubes slender, abruptly expanded to throats , lobes linear ; anther bases short-tailed, apical appendages linear, acute; style branches: fused portions with minutely hairy subterminal nodes, distinct portions oblong to linear, short-papillate. Cypselae oblong, ± angled , cylindric or 4-5-angled, ribs (when present) smooth or roughened, apices entire, glabrous or minutely glandular, attachment scars basal; pappi usually of 2 series, outer of readily falling, short bristles , inner persistent or falling as unit , of basally connate , usually longer , plumose bristles. x = 13, 14, 16, 17, 18, 19?.

Species 300-400: North America, Eurasia , 1 in Australia.

Saussurea is a notoriously difficult, largely Asiatic genus with species boundaries often indistinct.[1]

Physical Description

Species Saussurea americana

Plants 30-120+ cm; rootstocks short, stout; herbage loosely tomentose when young, glabrescent , sometimes ± glandular . Stems 1-many, leafy, simple or with ascending branches. Leaves cauline, usually more than 20, well distributed, proximal and mid with winged petioles to 6 cm, wings sometimes decurrent 1-2 cm on stems, blades lanceolate to triangular-ovate, 5-15 cm, bases cordate to truncate or tapering, margins sharply dentate , apices acute; mid and distal usually sessile, smaller, narrower, bases tapering. Heads 5-30+ in tight to open corymbiform arrays; (peduncles 0-5 cm). Involucres 10-15 mm. Phyllaries in ca. 5 series, strongly unequal, outer ± ovate , inner lanceolate, abaxial faces pale green, distally dark purplish to nearly black, loosely tomentose. Receptacles naked. Florets 8-21; corollas usually pale lavender-blue to dark purple (rarely white), 11-13 mm; tubes 5-6.5 mm, throats 1.5-2 mm, lobes 3.5-4 mm. Cypselae 4-6 mm; pappus bristles brownish, outer 3-7 mm, inner 9-10 mm. [source]

Saussurea americana is closely related to an Asian species, S. foliosa Ledebour. [source]

Habit: Forb/herb

Flowers: Bloom Period: July, August.

Habitat

Moist canyons , meadows, streamsides in montane forests ; 1000-2600 m

Typically found at an altitude of 0 to 2,174 meters (0 to 7,133 feet).[2]

Biology

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Reproduction

Duration: Perennial

Taxonomy

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Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 15-Mar-2000

Similar Species

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Members of the genus Saussurea

ZipcodeZoo has pages for 13 species, subspecies, varieties, forms, and cultivars in this genus:

S. alpina (Alpine Sawwort) · S. amara (Saussurea) · S. americana (American Saw-Wort) · S. angustifolia (Narrowleaf Saw-Wort) · S. angustifolia var. angustifolia (Narrowleaf Saw-Wort) · S. angustifolia var. yukonensis (Narrowleaf Saw-Wort) · S. angustifolia yukonensis (Narrowleaf Saw-Wort) · S. densa (Clustered Sawwort) · S. nuda (Nutty Saw-Wort) · S. tilesii (Tiles' Saussurea) · S. tschuktschorum (Tschuktsch's Saussurea) · S. viscida (Sticky Saw-Wort) · S. weberi (Weber's Saw-Wort)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 02, 2008:

Identifiers

Footnotes

  1. David J. Keil "Saussurea". in Flora of North America Vol. 19, 20 and 21 Page 58, 83, 165. Oxford University Press. Online at EFloras.org. [back]
  2. Mean = 1,216.860 meters (3,992.323 feet), Standard Deviation = 493.180 based on 66 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012