Difference between revisions of "Aristida purpurascens"
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==Description== | ==Description== | ||
<!-- Basic life history facts such as annual/perrenial, monoecious/dioecious, root morphology, seed type, etc. --> | <!-- Basic life history facts such as annual/perrenial, monoecious/dioecious, root morphology, seed type, etc. --> | ||
| − | ''A. purpurascens'' is a monoecious perennial graminoid<ref name="USDA"/> that tolerates moderate shade.<ref name="Magee 2012"/> In the sandhills, it can be found in a green or strongly glaucous-blue form.<ref name="Weakley 2015"/> 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 <sup>1</sup>/<sub>3</sub> to <sup>1</sup>/<sub>2</sub> the height of the plant. Awnes are <sup>1</sup>/<sub>2</sub> to <sup>3</sup>/<sub>4</sub> inches long. Seeds contain barblike hairs at the base.<ref name="Magee 2012"/> | + | ''A. purpurascens'' is a monoecious perennial graminoid<ref name="USDA"/> that tolerates moderate shade.<ref name="Magee 2012"/> In the sandhills, it can be found in a green or strongly glaucous-blue form.<ref name="Weakley 2015"/> 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 <sup>1</sup>/<sub>3</sub> to <sup>1</sup>/<sub>2</sub> the height of the plant.<ref name="Magee 2012"/> Awnes are <sup>1</sup>/<sub>2</sub> to <sup>3</sup>/<sub>4</sub> inches long<ref name="Magee 2012"/> and twice as thick at the base<ref name="Allred 1986">Allred K. W. (1986). Studies in the ''Aristida'' (Gramineae) of the southeastern United States. IV. Key and Conspectus. Rhodora 88(855):367-387.</ref>. Seeds contain barblike hairs at the base.<ref name="Magee 2012"/> |
==Distribution== | ==Distribution== | ||
Revision as of 15:26, 14 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, especially those containing sandy or rocky soils.[1] In Maryland pine-cedar savannas, A. purpurascens was the second most important species as calculated by summing the relative frequency and relative cover.[6]
Seed dispersal
Seeds production usually peaks in June.[3]
Fire ecology
A. purpurascens withstands annual burning.[3]
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).[7] 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 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.
- ↑ 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.
- ↑ 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.
- ↑ Howard W. E. and Evans F. C. (1961). Seeds stored by prairie deer mice. Journal of Mammalogy 42(2):260-263.
