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Andropogon virginicus

(Broom Sedge)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

Broom Sedge, Broom-Sedge, Broom-Sedge Bluestem, Broomsedge, Broomsedge Bluestem, Whiskey Grass, Whisky Grass, Yellow Bluestem, Yellowsedge Bluestem

Common Names in Portuguese:

Andropogon

Description

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Genus Andropogon

Annual or perennial . Leaf blades linear , not aromatic ; ligule scarious or reduced to a line of hairs . Inflorescence simple or compound ; racemes fragile, usually paired , occasionally digitate or single, terminal on the culm or axillary and gathered into a spathate compound panicle; spikelets of a pair dissimilar; raceme bases not deflexed , without homogamous spikelets (present in A. munroi) ; rachis internodes filiform to linear or clavate , sometimes inflated , ciliate on margins . Sessile spikelet usually dorsally compressed ; callus short, obtuse , shortly bearded , inserted into internode apex; lower glume membranous to leathery, 2-keeled, lanceolate, flat to concave with lateral keels , these sometimes narrowly winged , with or without intercarinal veins, or linear with dorsal keels and a deep veinless median groove ; upper glume awned or awnless; lower floret reduced to a hyaline lemma; upper lemma hyaline, 2-lobed, awned from sinus ; awn geniculate , column glabrous or puberulous . Stamens 1-3. Pedicelled spikelet variable, large to much reduced, male or barren. x = 10.

About 100 species: tropical and warm-temperate regions of both hemispheres, especially Africa and America; two species in China.[1]

Physical Description

Species Andropogon virginicus

"Perennial tall bunchgrass with tufted stems, 50-100 cm tall, branches 1-3 at node. Leaves: Leaf-sheaths more or less tuberculate-hirsute on the margins with long usually lax hairs ; ligule yellow-brown, membranous, truncate , white-fringed at edge ; blades 40 cm long or less, 2-5 mm wide, rough or roughish, hirsute on the upper surface near the base ; spathes 3-5 cm long, extending beyond the racemes . Racemes: 2 (-3-4), 2-3 cm long. Spikelets : Sessile spikelet 3-4 mm long, twice to half again as long as the internode, the awn straight, 10-15 mm long; pedicellate spikelet wanting or rarely present as a minute scale, pedicel exceeding the sessile spikelet. Flowers: Either sessile and hermaphrodite, or stalked and staminate , sterile or not developed." (Cronk and Fuller, 1995. In PIER , 2003)

Habit: Graminoid

Flowers: Bloom Period: July, August. • Flower Color: goldyellow-orange

Size/Age/Growth

Size: 36-48" tall.

Habitat

Subhumid to humid subtropical areas on a wide range of soils, (PIER , 2003). From sea level to 1,600 m in Hawaii, (Smith). Dried material contributes to fire hazard, and reproduction is encouraged by fire, (PIER, 2003). On infertile soils (low in nitrogen or phosphorous), I. virginicus acts as a long-lived competitor, (Uchytil, 1992). Work in Tennesse showed broomsedge to have an average lifespan of 3-5 years and that all plants died within 7 years.

Typically found at an altitude of 0 to 2,426 meters (0 to 7,959 feet).[2]

Ecology: This perennial bunchgrass sometimes forms continuous cover in boggy, open mesic and dry habitats . It releases highly persistent allelopathic substances (Rice 1972, In Smith). The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler, 1980, in Smith). In areas where it occurs, both fire intensities and acreage burnt have increased, (Smith). Work in Oklahoma in the US showed no change with a single spring burn , an increase with two spring burns, and that it was drastically reduced with a summer or fall burn when soil conditions were dry. Andropogon virginicus invades forest and other native vegetation, along tracks, (ESC, undated). Nearly pure stands can persist as a result of competition and allelopathy, (Uchytil, 1992).

Biology

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Reproduction

The seed is well adapted to catch in wool and fur as well as in clothing (PIER , 2003). May also be spread on mud on machinery, (PIER, 2003). Seeds are also dispersed by wind and readily establish on exposed soil, (Uchytil, 1992). Each flowering culm may have as many as 50 racemes , and each raceme 8 to 12 spikelets . Germination is relatively high after cold stratification . (Uchytil, 1992)

Flowering begins when plants are 2 or 3 years old, and continues thereafter (Uchytil, 1992).

Duration: Perennial

Growth

Culture: Space 36-48" apart.

Soil: Minimum pH: 5.6 • Maximum pH: 6.5

Sunlight: Sun Exposure: Full Sun .

Temperature: Cold Hardiness: 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. (map)

Taxonomy

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Synonyms

Anatherum virginicum (L.) Desv. • Anatherum virginicum (L.) Spreng.

Notes

Name Status: Accepted Name .

Last scrutiny: 17-Oct-2001

Similar Species

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Members of the genus Andropogon

ZipcodeZoo has pages for 42 species, subspecies, varieties, forms, and cultivars in this genus:

A. arctatus (Pinewoods Bluestem) · A. bicornis (Barbas De Indio) · A. bicornis var. paranensis (West Indian Foxtail Grass) · A. binatus (Sabaigrass) · A. brachystachyus (Short-Spike Bluestem) · A. capillipes (Chalky Bluestem) · A. chevalieri (Beardgrass) · A. filipendulus (Hyparrhenia) · A. floridanus (Florida Bluestem) · A. gayanus (Bluestem) · A. gerardi (Big Bluestem) · A. gerardii (Big Bluestem) · A. gerardii var. gerardii (Big Bluestem) · A. gerardii 'Pawnee' (Big Bluestem) · A. glaucopsis (Chalky Bluestem) · A. glomeratus (Broomsedge) · A. glomeratus var. glomeratus (Bushy Bluestem) · A. glomeratus var. hirsutior (Bushy Bluestem) · A. glomeratus var. pumilus (Bushy Bluestem) · A. glomeratus var. scabriglumis (Bushy Bluestem) · A. gracilis (Silky Bluestem) · A. gyrans (Beardgrass) · A. gyrans var. gyrans (Elliott's Bluestem) · A. gyrans var. stenophyllus (Elliotts Bluestem) · A. hallii (Sand Bluestem) · A. leucostachys (Matojillo Bluestem) · A. leucostachyus (Matojillo Bluestem) · A. longiberbis (Hairy Bluestem) · A. mohrii (Mohr Bluestem) · A. propinquus (Sorghum) · A. sorghum (Sorghum) · A. sorghum halepensis (Aleppo Milletgrass) · A. ternarius (Silver Bluestem) · A. ternarius var. cabanisii (Splitbeard Bluestem) · A. ternarius var. ternarius (Splitbeard Bluestem) · A. tracyi (Tracy's Bluestem) · A. virginicus (Broom Sedge) · A. virginicus var. decipiens (Broomsedge) · A. virginicus var. glaucus 'Silver Beauty' (Blue Stem Grass) · A. virginicus var. scabriglumus (Broomsedge Bluestem) · A. virginicus var. virginicus (Broomsedge Bluestem) · A. vulgaris (Broomcorn)

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 November 14, 2007:

Identifiers

Footnotes

  1. Shou-liang Chen & Sylvia M. Phillips "Andropogon". in Flora of China Vol. 22 Page 572, 621, 623, 624, 627. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. Mean = 186.770 meters (612.762 feet), Standard Deviation = 186.130 based on 995 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/14/2012