Difference between revisions of "Aristida purpurascens"

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Associated species: ''Andropogon virginicus'' var. ''virginicus'', ''Andropogon virginicus'' var. ''glaucus'', ''Andropogon'' sp., ''Schizochyrium stoloniferum'', ''Hedyotis uniflora'', ''Hypericum gentianoides'', ''Hypericum suffruticosum'', ''Hypericum'' sp., ''Paspalum setaceum'', ''Desmodium lineatum'', ''Desmodium'' sp., ''Panicum verrucosum'', ''Cenchrus'' sp., ''Setaria'' sp., ''Baccharis'' sp., ''Aristida stricta'', ''Sporobolus clandestinus'', ''Helianthus'' sp., and ''Lobelia'' sp.<ref name= "Herbarium"/>
 
Associated species: ''Andropogon virginicus'' var. ''virginicus'', ''Andropogon virginicus'' var. ''glaucus'', ''Andropogon'' sp., ''Schizochyrium stoloniferum'', ''Hedyotis uniflora'', ''Hypericum gentianoides'', ''Hypericum suffruticosum'', ''Hypericum'' sp., ''Paspalum setaceum'', ''Desmodium lineatum'', ''Desmodium'' sp., ''Panicum verrucosum'', ''Cenchrus'' sp., ''Setaria'' sp., ''Baccharis'' sp., ''Aristida stricta'', ''Sporobolus clandestinus'', ''Helianthus'' sp., and ''Lobelia'' sp.<ref name= "Herbarium"/>
  
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''A. purpurascens'' exhibits a positive response to soil disturbance by agriculture in South Carolina plant communities indicating post-agriculture woodlands.<ref>Brudvig, L.A. and E.I. Damchen. (2011). Land-use history, historical connectivity, and land management interact to determine longleaf pine woodland understory richness and composition. Ecography 34: 257-266.</ref>
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''A. purpurascens'' exhibits a positive response to soil disturbance by agriculture in South Carolina plant communities indicating post-agriculture woodlands.<ref>Brudvig, L.A., E Grman, C.W. Habeck, and J.A. Ledvina. (2013). Strong legacy of agricultural land use on soils and understory plant communities in longleaf pine woodlands. Forest Ecology and Management 310: 944-955.</ref>
  
 
===Phenology=== <!--Timing off flowering, fruiting, seed dispersal, and environmental triggers.  Cite PanFlora website if appropriate: http://www.gilnelson.com/PanFlora/ -->
 
===Phenology=== <!--Timing off flowering, fruiting, seed dispersal, and environmental triggers.  Cite PanFlora website if appropriate: http://www.gilnelson.com/PanFlora/ -->

Revision as of 15:18, 27 June 2019

Aristida purpurascens
Aristida purpurascens AFP.jpg
Photo by the Atlas of Florida Plants Database
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Moncots
Order: Cyperales
Family: Poaceae
Genus: Aristida
Species: A. purpurascens
Binomial name
Aristida purpurascens
Poiret
ARIS PURP DIST.JPG
Natural range of Aristida purpurascens from USDA NRCS Plants Database.

Common Name(s): Arrowfeather,[1] Arrowfeather Threeawn[2]

Taxonomic Notes

Synonyms: A. purpurascens Poiret var. purpurascens; A. purpurascens Poiret var. minor Vasey

Varieties: none

Description

A. purpurascens is a monoecious cool-season perennial graminoid[2] that tolerates moderate shade.[3] In sandhill pine communities, it can be found in a green or strongly glaucous-blue form.[1] It reaches heights of 1.5-2.0 ft (0.46-0.61 m) with flat narrow leaf blades 4-12 in (10.2-30.5 m) long. Seedheads have a narrow panicle that is 1/3 to 1/2 the height of the plant.[3] Awnes are 1/2 to 3/4 inches long[3] and twice as thick at the base[4]. Seeds contain barblike hairs at the base.[3]

Distribution

Aristida purpurascens is found from Massachusetts west to Wisconsin and Kansas and southward to Florida and Texas.[1][2] It may also be found in parts of Nebraska and Ontario, Canada.[2][5]

Ecology

Habitat

This species is found in dry habitats[1] including pine savannas, fields, dunes, waste places, and other disturbed sites,[6][4][7] especially those containing sandy or rocky soils.[1] A study in Michigan old fields showed A. purpurascens had the second highest standing crop, which peaked in August at 270 g m-2 dry weight.[8] In Maryland pine-cedar savannas, A. purpurascens was the second most important species (IV = 23.5%; Importance Value Index[IV] - calculated by summing the relative frequency and relative cover).[9] Lesser importance was found in Maryland serpentine barrens between 1989 and 1992 (IV = 1.4-6.5%).[10] Despite its importance in dryer systems, A. purpurascens is also observed in seepage bogs with similar, or slightly greater, coverage as pine savannas.[7] In Louisiana sandstone outcrops where A. purpurascens also occurs, topsoil calcium were measured at 2267.5 ppm and magnesium at 586.5 ppm.[11] Dead material of A. purpurascens disappears from 2.0-2.7 mg g-1 in the fall (mid July-mid November) and 0.1-1.0 mg g-1 the rest of the year in a Michigan old field.[8]

Associated species: Andropogon virginicus var. virginicus, Andropogon virginicus var. glaucus, Andropogon sp., Schizochyrium stoloniferum, Hedyotis uniflora, Hypericum gentianoides, Hypericum suffruticosum, Hypericum sp., Paspalum setaceum, Desmodium lineatum, Desmodium sp., Panicum verrucosum, Cenchrus sp., Setaria sp., Baccharis sp., Aristida stricta, Sporobolus clandestinus, Helianthus sp., and Lobelia sp.[6]

A. purpurascens exhibits a positive response to soil disturbance by agriculture in South Carolina plant communities indicating post-agriculture woodlands.[12]

Phenology

A. purpurascens has been observed to flower from July to December with peak inflorescence in October. It has been observed fruiting from July to December as well as the month of February.[6] Seeds production usually peaks in June.[3]

Seed dispersal

This species is thought to be dispersed by gravity. [13]

Fire ecology

A. purpurascens withstands annual burning.[3] On Eglin Air Force Base, Florida, May and July burns increased the percentage of flowering culms on A. purpurascens.[14] As well, a study in north Florida found that A. purpurascens increases in frequency in response to fire, and time of year for burning did not seem to affect it.[15] In Maryland serpentine barrens, clearing and the combination of clearing and burning increased the importance value percentage to between 3.0-12.2% from between 1.4-6.5%[10] However, one study about fire exclusion found that A. purpurascens had a higher frequency in quadrats sampled in the fire exclusion areas compared to normal burning regiments.[16]

Use by animals

Seeds from this grass compose 2-5% of the diet of some terrestrial birds.[2] A study in Michigan showed the seeds of A. purpurascens was also abundant in the caches of prairie deer mice (Peromyscus maniculatus bairdii).[17] For a few weeks in the spring cattle can graze arrowfeather, but in the rest of the year it is considered a low quality forage.[3]

Conservation and Management

To reduce the abundance of A. purpurascens, grazing can be allowed for 2-3 weeks in the spring just before seedheads appear.[3] A. purpurascens is listed as a species of special concern in Connecticut, and listed as threatened in Massachusetts, Pennsylvania, and Rhode Island.[2]

Cultivation and restoration

Photo Gallery

References and notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Weakley A. S.(2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC: University of North Carolina Herbarium.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 USDA, NRCS. (2016). The PLANTS Database (http://plants.usda.gov, 14 December 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Magee P. (2012). Plant fact sheet: Arrowfeather threeawn Aristida purpurascens. United States Department of Agriculture, Natural Resources Conservation Service, Baton Rouge, LA.
  4. ↑ 4.0 4.1 Allred K. W. (1986). Studies in the Aristida (Gramineae) of the southeastern United States. IV. Key and Conspectus. Rhodora 88(855):367-387.
  5. ↑ Catling P. M., Reznicek A. A., Riley J. L. (1977). Some new and interesting grass records from southern Ontario. Canadian Field-Naturalist 91(4):350-359.
  6. ↑ 6.0 6.1 6.2 Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: March 2019. Collectors: Loran C. Anderson, Wilson Baker, L. Baltzell, Robert Blaisdell, Kathleen Craddock Burks, R. B. Channel, A. F. Clewell, M. Darst, A. Gholson, Jr., J. P. Gillespie, R. K. Godfrey, Floyd Griffith, Dianne Hall, J. M. Kane, Ed Keppner, Lisa Keppner, Gary R. Knight, R. Komarek, R. Kral, John M. Kunzer, Sidney McDaniel, Richard S. Mitchell, John Morrill, Robert A. Norris, R. E. Perdue, Jr., Cecil R. Slaughter, M. Stevenson, and A. Stiles. States and Counties: Florida: Alachua, Bay, Calhoun, Clay, Dixie, Duval, Escambia, Flagler, Franklin, Gadsden, Hamilton, Hillsborough, Jackson, Leon, Levy, Liberty, Madison, Manatee, Marion, Monroe, Nassau, Okaloosa, Osceola, Pinellas, Putnam, Sarasota, Wakulla, Walton, and Washington. Georgia: Atkinson, Baker, Coffee, Grady, Lanier, and Thomas. Louisiana: Vernon. Alabama: Baldwin.
  7. ↑ 7.0 7.1 Drewa P. B., Platt W. J., and Moser B. (2002). Community structure along elevation gradients in headwater regions of longleaf pine savannas. Plant Ecology 160:61-78.
  8. ↑ 8.0 8.1 Wiegert R. G. and Evans F. C. (1964). Primary production and the disappearance of dead vegetation on an old field in southeastern Michigan. Ecology 45(1):49-63.
  9. ↑ Tyndall R. W. and Farr P. M. (1989). Vegetation structure and flora of a serpentine pin-cedar savanna in Maryland. Castanea 54(3):191-199.
  10. ↑ 10.0 10.1 Tyndall R. W. (1994). Conifer clearing and prescribed burning effects to herbaceous layer vegetation on a Maryland serpentine "barren." Castanea 59(3):255-273.
  11. ↑ Kley J. E. V. (1999). The vegetation of the Kisatchie Sandstone Hills, Louisiana. Castanea 64(1):64-80.
  12. ↑ Brudvig, L.A., E Grman, C.W. Habeck, and J.A. Ledvina. (2013). Strong legacy of agricultural land use on soils and understory plant communities in longleaf pine woodlands. Forest Ecology and Management 310: 944-955.
  13. ↑ Kirkman, L. Katherine. Unpublished database of seed dispersal mode of plants found in Coastal Plain longleaf pine-grasslands of the Jones Ecological Research Center, Georgia.
  14. ↑ Shepherd B. J., Miller D. L., and Thetford M. (2012). Fire season effects on flowering characteristics and germination of longleaf pine (Pinus palustris) savanna grasses. Restoration Ecology 20(2):268-276.
  15. ↑ Kush, J. S., et al. (2000). Understory plant community response to season of burn in natural longleaf pine forests. Proceedings 21st Tall Timbers Fire Ecology Conference. Fire and forest ecology: innovative silviculture & vegetation management, Tallahassee, FL, Tall Timbers Research, Inc.
  16. ↑ Clewell, A. F. (2014). "Forest development 44 years after fire exclusion in formerly annually burned oldfield pine woodland, Florida." Castanea 79: 147-167.
  17. ↑ Howard W. E. and Evans F. C. (1961). Seeds stored by prairie deer mice. Journal of Mammalogy 42(2):260-263.
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