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Aristida Longespica Poiret Three-Awnedthree-Awned Grass, Grass Page 1

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Aristida Longespica Poiret Three-Awnedthree-Awned Grass, Grass Page 1 Aristida longespica Poiret three-awnedthree-awned grass, grass Page 1 State Distribution Best Survey Period Photo courtesy of Texas Vascular Plant Image Library Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Status: State threatened and Vermont and notably is of undetermined status in several states (NatureServe 2003). Global and state rank: G5/S2 State distribution: Three-awned grass is restricted to Other common names: slim-spike or slimspike three- southeastern Lower Michigan, where this species has awn grass, spiked needlegrass been documented primarily from Wayne County (seven sites) and St. Clair County (two sites), with single Synonym: A. longispica Poiret localities known for Gratiot, Midland, Monroe, and Oakland counties. Reports that remain unevaluated at Family: Poaceae (also known as Gramineae; grass present will potentially result in the addition of several family) new occurrences to the statewide database. All of these occurrences were found in glacial lakeplain landscapes, Taxonomy: Michigan plants are referred to var. frequently in association with remnant wet prairies. longespica, the typical variety. Plants south and west Most of Michigan’s localities have been documented of Michigan include var. geniculata (Raf.) Fern., which over approximately the last decade and a half as is characterized by glumes up to 9 mm in length and familiarity with the region’s lakeplain wet prairies has lateral awns longer than in var. longespica. increased. Total range: Aristida longespica is a broadly Recognition: Three-awned grass is an obscure grass distributed species primarily of the eastern and south- species that could be easily overlooked, even when central United States, ranging from New Hampshire occurring in abundance because of its small, slender, through southern Ontario and Minnesota, occurring delicate habit. An annual species growing in loose west to the Great Plains, including South Dakota, clumps and typically attaining ca. 1-2 dm in height, A. Nebraska, and Kansas, and south to the Gulf from longespica produces a narrow flowering stem of Florida to Texas and just inside the east border of New crowded, upright spikelets. It is distinguished from other Mexico. Outside the main distribution it is also known in three-awned grasses in Michigan primarily by the size Arizona and Washington State. This species is and shape of the floret awns. The middle awn, considered rare in Illinois, Iowa, Ontario, Rhode Island, which lacks spiral loops at its base, is ca. 7-12 mm Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552 three-awned grass, Page 2 long and at maturity is strongly reflexed, whereas succession and maintaining the open, graminoid- the two lateral awns are 1-4 mm long and are erect dominated communities in which this species thrives. to only slightly spreading. This species is most likely to be confused with A. necopina, with which it may Conservation/management: Michigan’s best commonly occur. A. necopina is superficially similar populations of three-awned grass occur in lakeplain wet but produces significantly longer awns, with a middle prairie remnants. Unfortunately, many of these sites, awn that ranges from ca. 15-33 mm long and lateral some of which support large populations, are often awns that range from 9-26 mm long, and all of the awns degraded prairie relicts occurring within or near fast are spreading. One technique helpful in the developing urban centers. This species appears to have determination of three-awned grasses, if observed early, persisted in part because of soil disturbance activities is to simply collect plants and dry them without pressing, (e.g. borrow pits), and in some cases, has even so as to induce the awns to assume their characteristic emerged from the soil seed bank as a result of activities shape. along highways. One of Michigan’s largest populations of three-awned grass occurs within and around the Best survey time/phenology: A. longespica is a Detroit Metropolitan Airport, existing in the remaining late season species, and is best sought from lakeplain prairies of the complex and even in abundance approximately mid-August through October, although in proximity to runways and other areas where ongoing plants may be remain recognizable through late fall, and maintenance occurs. However, ongoing stewardship, can occasionally be collected even later and determined including the use of prescribed fire management, is by experienced botanists. being conducted in one remnant lakeplain prairie site in Wayne County and in a high quality lakeplain prairie Habitat: All of Michigan’s occurrences of three- complex in St. Clair County. These stewardship awned grass have been found in sandy substrates in initiatives should result in information that will provide glacial lakeplain landscapes, where this species is helpful guidance in maintaining three-awned grass and typically associated with lakeplain wet prairie or several of its rare associated species. lakeplain wet-mesic prairie. These habitats are characterized by a fluctuating water table, with cyclical Research needs: In addition to experimental flooding and periodic drawdowns that expose the seed restoration management and monitoring, life history bank of this and several other graminoids by late studies focusing on population demography and genetic season. Associates include such species as diversity would assist in conservation. Andropogon virginicus (broom-sedge), Aristida basiramea (three-awned grass), Aristida necopina Related abstracts: Lakeplain wet prairie, lakeplain (three-awned grass), Calamagrostis canadensis (blue- wet-mesic prairie, oak barrens, Gattinger’s gerardia, joint), Euthamia graminifolia (grass-leaved goldenrod), Skinner’s gerardia, chestnut sedge, Leiberg’s panic Juncus canadensis (Canada rush), Hypericum grass, smooth beard tongue, few-flowered nut-rush, gentianoides (gentian-leaved St. John’s-wort), purple milkweed, Sullivant’s milkweed, Hill’s thistle, Hypericum prolificum (shrubby St. John’s-wort), northern appressed clubmoss, Eastern prairie fringed Lechea villosa (hairy pinweed), Lespedeza capitata orchid, Allegany plum, meadow-beauty, blazing star (prairie bush-clover), Ludwigia alternifolia (seedbox), borer, culver’s root borer, eastern box turtle, red-legged Monarda punctata (horsemint), Polygala sanguinea spittlebug, Silphium borer (field milkwort), Polygonum tenue (slender knotweed), Quercus palustris (pin oak), Scleria pauciflora (few- flowered nut-rush), and Scleria triglomerata (tall nut- Selected references: rush), among numerous other lakeplain prairie species. Flora of North America Editorial Committee. 2003. Flora of North America North of Mexico. Biology: A. longespica is an annual, warm season Volume 25: Magnoliophyta: Commelinidae grass, occurring in habitats with fluctuating water (in part): Poaceae, part 2. Oxford University tables. Fire is also likely an important factor in Press. New York, NY. 783 pp. perpetuating this species by inhibiting woody plant Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552 three-awned grass, Page 3 NatureServe. 2003. NatureServe Explorer: An Online encyclopedia of life [web application]. Version 1.8. NatureServe, Arlington, Virginia. Available http://www.natureserve.org/explorer. (Accessed: November 11, 2003). Voss, E. G. 1972. Michigan Flora. Part I. Gymnosperms and Monocots. Bull. Cranbrook Inst. Sci. 55 and Univ. of Michigan Herbarium. xv + 488 pp. Abstract citation Penskar, M.R. 2004. Special plant abstract for Aristida longespica (three-awned grass). Michigan Natural Features Inventory. Lansing, MI. 3 pp. Copyright 2004 Michigan State University Board of Trustees. Michigan State University Extension is an affirmative-action, equal-opportunity organization. Funding for abstract provided by the National Oceanic and Atmospheric Administration (NOAA) Coastal Services Center via the Great Lakes Commission. Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552.
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