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Arrhenatherum elatius

(False Oat Grass)

Common Names

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Common Names in English:

False Oat Grass, Oatgrass, Tall Oatgrass

Description

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Family Poaceae

Annual or perennial herbs, or tall woody bamboos . Flowering stems (culms ) jointed , internodes hollow or solid; branches arising singly from nodes and subtended by a leaf sheath and 2-keeled prophyll, often fascicled in bamboos. Leaves arranged alternately in 2 ranks , differentiated into sheath, blade , and an adaxial erect appendage at sheath/blade junction (ligule) ; leaf sheath surrounding and supporting culm-internode, split to base or infrequently tubular with partially or completely fused margins , modified with reduced blade in bamboos (culm sheaths) ; leaf blades divergent, usually long, narrow and flat, but varying from inrolled and filiform to ovate , veins parallel, sometimes with cross-connecting veinlets (especially in bamboos) ; ligule membranous or a line of hairs . Inflorescence terminal or axillary , an open, contracted , or spikelike panicle, or composed of lax to spikelike racemes arranged along an elongate central axis, or digitate, paired , or occasionally solitary; axillary inflorescences often many, subtended by spatheoles (specialized bladeless leaf sheaths) and gathered into a leafy compound panicle; spikelets often aggregated into complex clusters in bamboos. Spikelets composed of distichous bracts arranged along a slender axis (rachilla) ; typically 2 lowest bracts (glumes ) empty, subtending 1 to many florets ; glumes often poorly differentiated from accompanying bracts in bamboos. Florets composed of 2 opposing bracts enclosing a single small flower, outer bract (lemma) clasping the more delicate, usually 2-keeled inner bract (palea) ; base of floret often with thickened prolongation articulated with rachilla (callus) ; lemma often with apical or dorsal bristle (awn ), glumes also sometimes awned . Flowers bisexual or unisexual ; lodicules (small scales representing perianth) 2, rarely 3 or absent, 3 to many in bamboos, hyaline or fleshy ; stamens 3 rarely 1, 2, 6, or more in some bamboos, hypogynous, filaments capillary , anthers versatile; ovary 1-celled, styles (1 or) 2(rarely 3), free or united at base, topped by feathery stigmas, exserted from sides or apex of floret. Fruit normally a dry indehiscent caryopsis with thin pericarp firmly adherent to seed, pericarp rarely free, fleshy in some bamboos; embryo small or large; hilum punctate to linear .

About 700 genera and 11,000 species: widely distributed in all regions of the world.[1]

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.[2]

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).[3]

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 . Latest taxonomic scrutiny: 15-Mar-2000

Place of publication : Fl. cech. 17. 1819

Name verified on 06-May-1992 by ARS Systematic Botanists. Last updated: 20-Nov-2007

Similar Species

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Members of the genus Arrhenatherum

ZipcodeZoo has pages for 79 species, subspecies, varieties, forms, and cultivars in this genus:

A. alatius · A. album · A. album var. erianthum · A. almijarense · A. americanum · A. asperum · A. avenaceum · A. avenaceum var. bulbosum · A. avenaceum var. nodosum · A. baeticum · A. barbatum · A. biaristatum · A. bispanicum · A. bromoides · A. bulbosum · A. calderae · A. capense · A. cechicum · A. compactum · A. delavayi · A. desertorum · A. dodii · A. elatior · A. elatius (False Oat Grass) · A. elatius bulbosum · A. elatius bulbosum var. bulbosum (Tuber Oat Grass) · A. elatius bulbosum 'Variegatum' (Bulbous Oat Grass) · A. elatius sardoum · A. elatius subsp. baeticum · A. elatius subsp. braun-blanquetii · A. elatius subsp. sardoum · A. elatius tuberosum · A. elatius var. bulbosum (Tuber Oatgrass) · A. elatius var. bulbosum 'Variegatum' · A. elatius var. elatius (Tall Oatgrass) · A. elatius var. nodosum · A. elongatum · A. erianthum · A. exserens · A. filifolium · A. galpinii · A. hirtulum · A. hookeri · A. ilievii · A. junghuhnii · A. kotschyi · A. kotschyii · A. lachnanthum · A. leoninum · A. longifolium · A. longum · A. macrostachyum · A. mannii · A. milanjianum · A. montanum · A. mortonianum · A. murcicum · A. natalense · A. nebrodense · A. palaestinum · A. palestinum · A. pallens · A. parlatorei · A. pratense · A. precatorium · A. pubescens · A. puelii · A. riofrioi · A. rivulare · A. rupestre · A. sardoum · A. sedenense · A. setaceum · A. sulcatum · A. thorei · A. tuberosum · A. umbrosum · A. variegatum · A. virescens

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. Shou-liang Chen, De-Zhu Li, Guanghua Zhu, Zhenlan Wu, Sheng-lian Lu, Liang Liu, Zheng-ping Wang, Bi-xing Sun, Zheng-de Zhu, Nianhe Xia, Liang-zhi Jia, Zhenhua Guo, Wenli Chen, Xiang Chen, Yang Guangyao, Sylvia M. Phillips, Chris Stapleton, Robert J. Soreng, Susan G. Aiken, Nikolai N. Tzvelev, Paul M. Peterson, Stephen A. Renvoize, Marina V. Olonova & Klaus Ammann "Poaceae". in Flora of China Vol. 22. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. 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]
  3. 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: 7/1/2009