Difference between revisions of "Aristida purpurascens"
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==Ecology== | ==Ecology== | ||
===Habitat=== <!--Natural communities, human disturbed habitats, topography, hydrology, soils, light, fire regime requirements for removal of competition, etc.--> | ===Habitat=== <!--Natural communities, human disturbed habitats, topography, hydrology, soils, light, fire regime requirements for removal of competition, etc.--> | ||
| − | This species is found in dry habitats<ref name="Weakley 2015"/> including pine savannas, fields, and waste places,<ref name="Allred 1986"/><ref name="Drewa et al 2002"/> especially those containing sandy or rocky soils.<ref name="Weakley 2015"/> A study in Michigan old fields showed ''A. purpurascens'' had the second highest standing crop, which peaked in August at 270 g m<sup>-2</sup> dry weight.<ref>Wiegert R. | + | This species is found in dry habitats<ref name="Weakley 2015"/> including pine savannas, fields, and waste places,<ref name="Allred 1986"/><ref name="Drewa et al 2002"/> especially those containing sandy or rocky soils.<ref name="Weakley 2015"/> A study in Michigan old fields showed ''A. purpurascens'' had the second highest standing crop, which peaked in August at 270 g m<sup>-2</sup> dry weight.<ref name="Wiegert & Evans 1964">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.</ref> In Maryland pine-cedar savannas, ''A. purpurascens'' was the second most important species (Importance Value Index - calculated by summing the relative frequency and relative cover).<ref name="Tyndall & Farr 1989">Tyndal R. W. and Farr P. M. (1989). Vegetation structure and flora of a serpentine pin-cedar savanna in Maryland. Castanea 54(3):191-199.</ref> Despite its importance in dryer systems, ''A. purpurascens'' is also observed in seepage bogs with similar, or slightly greater, coverage as pine savannas.<ref name="Drewa et al 2002">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.</ref> In Louisiana sandstone outcrops where ''A. purpurascens'' also occurs, topsoil calcium were measured at 2267.5 ppm and magnesium at 586.5 ppm.<ref name="Kley 1999">Kley J. E. V. (1999). The vegetation of the Kisatchie Sandstone Hills, Louisiana. Castanea 64(1):64-80.</ref> |
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<!--===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 07:59, 15 December 2017
| Aristida purpurascens | |
|---|---|
| |
| 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 | |
| |
| Natural range of Aristida purpurascens from USDA NRCS Plants Database. | |
Common Name(s): arrowfeather,[1] arrowfeather threeawn[2]
Contents
Taxonomic Notes
Varieties: A. purpurascens var. purpurascens; A. purpurascens var. tenuispica; A. purpurascens var. virgata[2]
Description
A. purpurascens is a monoecious perennial graminoid[2] that tolerates moderate shade.[3] In the sandhills, 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, and waste places,[4][6] 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.[7] In Maryland pine-cedar savannas, A. purpurascens was the second most important species (Importance Value Index - calculated by summing the relative frequency and relative cover).[8] Despite its importance in dryer systems, A. purpurascens is also observed in seepage bogs with similar, or slightly greater, coverage as pine savannas.[6] In Louisiana sandstone outcrops where A. purpurascens also occurs, topsoil calcium were measured at 2267.5 ppm and magnesium at 586.5 ppm.[9]
Seed dispersal
Seeds production usually peaks in June.[3]
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.[10]
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).[11] 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]
Cultivation and restoration
Photo Gallery
References and notes
- ↑ 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.
- ↑ 2.0 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.
- ↑ 3.0 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.
- ↑ 4.0 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.
- ↑ 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.
- ↑ 6.0 6.1 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.
- ↑ 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.
- ↑ Tyndal R. W. and Farr P. M. (1989). Vegetation structure and flora of a serpentine pin-cedar savanna in Maryland. Castanea 54(3):191-199.
- ↑ Kley J. E. V. (1999). The vegetation of the Kisatchie Sandstone Hills, Louisiana. Castanea 64(1):64-80.
- ↑ 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.
- ↑ Howard W. E. and Evans F. C. (1961). Seeds stored by prairie deer mice. Journal of Mammalogy 42(2):260-263.
