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Arrhenatherum elatius

(False Oat Grass)

Overview

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Interesting Facts

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Common Names

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Common Names in English:

False Oat Grass, Oatgrass, Tall Oatgrass

Description

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Genus Arrhenatherum

Perennial . Culms tall, basal internodes often swollen into globose corms. Leaf blades linear , flat. Inflorescence a moderately dense panicle. Spikelets weakly laterally compressed , florets 2, dimorphic , sometimes with an additional rudiment , lower floret staminate and strongly awned , upper floret bisexual and weakly awned or awnless; rachilla disarticulating above glumes but not between florets, extended beyond terminal floret; glumes unequal, thin, lower glume 1/2 spikelet length or more, 1-veined, upper glume as long as spikelet, 3-veined; lemmas firmly membranous to subleathery, rounded on back, 5-9-veined, apex 2-denticulate; lower lemma awned from near base , awn geniculate with twisted column, exserted from spikelet; upper lemma with a short straight awn or awnless; palea slightly shorter than lemma, keels ciliate . Ovary apex hairy ; hilum linear.

Seven species: SW Asia, Europe, Mediterranean region; one species (introduced ) in China.[1]

Physical Description

Species Arrhenatherum elatius

Culms erect or geniculate at base , rather stout, 1-1.5 m tall, 4-5-noded. Leaf sheaths loose , glabrous ; leaf blades 14-30 cm, 3-9 mm wide, scabrid or abaxial surface smooth , apex acuminate; ligule 1-3 mm, obtuse or truncate . Panicle lanceolate to oblong in outline, loose to rather dense, 10-25 cm, greenish or purplish, shining; branches clustered,scabrid. Spikelets oblong, 7-9 mm, florets separated by short rachilla internode not more than 0.6 mm; glumes lanceolate, apex acute; lower glume 4-6 mm, upper glume equal to spikelet, punctiform scabrid; lemmas oblong-lanceolate, 7-9 mm, sparsely pubescent in lower 1/3 or glabrous, scabrid in upper 1/3; awn of lower lemma 1-2 cm, arising from lower 1/3 of lemma back; awn of upper lemma 1-2 mm, arising above middle or near apex. Anthers 4-5 mm. 2n = 28. [source]

Habit: GraminoidGrowth Form: BunchShape and Orientation: Erect

Flowers: Bloom Period: Early Summer • Flower Color: Yellow • Flower Conspicuous: No

Seeds: Seed per Pound: 189120 • Seed Spread Rate: Moderate • Seedling Vigor: High • Fruit/Seed Abundance: High • Fruit/Seed Color: Brown • Fruit/Seed Conspicuous: No • Cold Stratification Required: No

Foliage: Foliage Color: Green • Foliage Porosity Summer: Moderate • Foliage Porosity Winter: Porous • Foliage Texture: Medium • Fall Conspicuous: No • Leaf Retention: No

Size/Age/Growth

Active Growth Period: SpringGrowth Rate: Moderate • After Harvest Regrowth Rate: Moderate • Mature Height (feet): 4.0 • Size: 12-18" tall. • Vegetative Spread Rate: None • Lifespan: Lifespan

Habitat

Typically found at an altitude of 0 to 3,180 meters (0 to 10,433 feet).[2]

Biology

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Reproduction

Duration: PerennialCoppice Potential: No • Progagated by Bulbs: No • Propagated by Bare Root: No • Propagated by Container: No • Propagated by Corms: No • Propagated by Cuttings: No • Propagated by Seed: Yes • Propagated by Sod: No • Propagated by Sprigs: No • Propagated by Tubers: No • Fruit/Seed Period Begin: SpringFruit/Seed Period End: Summer • Fruit/Seed Persistence: Yes

Growth

Soil: Adapted to Medium Textured: Adapted to Medium Textured Soils • Adapted to Coarse Textured Soils: Yes • Anaerobic Tolerance: None • Salinity Tolerance: Low • CaCO3 Tolerance: High • Minimum pH: 5.3 • Maximum pH: 7.3 • Fertility Requirement: Low

Sunlight: Sun Exposure: Sun to Partial Shade. • Shade Tolerance: Tolerant

Moisture: Drought Tolerance: Medium • Minimum Precipitation: 32 • Maximum Precipitation: 45 • Moisture Use: Medium

Temperature: Minimum Temperature (F): -43 • Minimum Frost Free Days: 145

Taxonomy

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Notes

Name Status: Accepted Name .

Last scrutiny: 15-Mar-2000

Similar Species

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Members of the genus Arrhenatherum

ZipcodeZoo has pages for 5 species, subspecies, varieties, forms, and cultivars in this genus:

A. elatius (False Oat Grass) · A. elatius bulbosum var. bulbosum (Tall Oatgrass) · A. elatius bulbosum 'Variegatum' (Bulbous Oat Grass) · A. elatius var. bulbosum (Tuber Oatgrass) · A. elatius var. elatius (Tall Oatgrass)

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 28, 2008:

Identifiers

Footnotes

  1. Zhen-lan Wu & Sylvia M. Phillips "Arrhenatherum". in Flora of China Vol. 22 Page 6, 316, 322. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. Mean = 168.950 meters (554.298 feet), Standard Deviation = 217.710 based on 20,000 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012