The specific epithet, striatula, means "with fine longitudinal lines" (Fernald 1970).
There is only one known population and three historical locations. As a plant at the northern edge of its range, this sedge has likely always been rare in New York. The one known population only has 20 plants. Surveys in the lower Hudson Valley should target this plant to determine if more populations are present.
The current known population was first discovered in 1990 and observed again in 1994. No information on trends is available for this population. All other populations of this species have not been observed in over 20 years, but surveys have been limited. Therefore, short-term trends are unknown.
This sedge is at the northern edge of its range in southeastern New York. This area of New York is under extreme pressure from urbanization. One of the known historical populations from Kings County is believed extirpated. A new population was first discovered in the lower Hudson Valley in 1990. This population was probably overlooked in the past. Overall, long term trends are not very pronounced or clear but may be indicating that this sedge is declining in New York.
There are no specific threats known for Carex striatula in New York but currently the only extant population in New York has fewer than 20 individuals present.
Deciduous granitic rocky woodlands in ravines with Quercus montana (New York Natural Heritage Program 2005). Dry to moist ravine slopes, deciduous or mixed deciduous-evergreen forests (Bryson and Naczi 2002). Rich open woods (Rhoads and Block 2000). Dry to mesic woods (Gleason & Cronquist 1991). Rich hardwoods (Fernald 1970).
In New York this sedge is only known from Long Island north to the lower Hudson Valley.
Carex striatula is an Eastern Gulf Coastal Plain and Gulf Coastal Plain species that does not commonly occur within glaciated territory or west of the Mississippi River. It ranges from the eastern third of Texas (Jones 1994), northeast through Tennessee, Kentucky and Long Island, New York and south to Florida and the Gulf states (Bryson 1980). It occurs much less commonly inland in the Piedmonts and Appalachian Mountains. There are no records for occurrences south of the United States/Mexico border, and Gaddy (1994) is very doubtful that is would occur any further south.
The range for C. striatula is very similar to the botanically comparable C. styloflexa, however C. striatula ranges further inland on the continent (Bryson 1994).
Carex striatula is a common and occasionally invasive perennial sedge of dry to slightly mesic deciduous woodlands. It grows as tufts up to 5-6 inches in diameter, but typically not over 3 inches. There are generally 4-10 stems per plant, although there may be up to 20-30 (Bryson 1994). The stems grow obliquely upward and are sharply triangular. The sheath that surrounds the stem at the base is white or light brown. The inflorescence contains a terminal pollen producing (staminate) spike and 2 or usually 3 pistillate spikes below the staminate spike. The small, dry indehiscent (not splitting open at maturity) fruit is a 3-angled achene. (Gleason and Cronquist 1991).
Carex striatula is very similar to C. laxiflora and has bases of leaf sheaths tan or light brown (use magnification and light to assess). The proximal spikes are pistillate and have a peduncle 0-5 cm long while the terminal spike is staminate and has a peduncle 0.4-12 cm long. Lateral spikes are 22-62 mm long and 3-5 mm wide and the terminal spike is 22-32(-36) mm long and 2-3 mm wide. There are 6-18 loosely overlapping to more remote perigynia per pistillate spike. Perigynia are ascending, finely many nerved, and (3.4-)3.9-5.1 mm long with a straight to slightly curved beak 0.6-1.7 mm long (Bryson and Naczi 2002).
This species is close in appearance to some other members of section Laxiflorae and is best identified while it has slightly immature to mature fruit.
Carex striatula is a member of the section Laxiflorae which has a few other species in New York (C. albursina, C. blanda, C. gracilescens, C. laxiflora, C. leptonervia, C. ormostachya, and C. styloflexa). Many of these species are at least superficially similar.
Carex gracilescens and C. ormostachya have red/purple lower sheath bases. Carex albursina often has wider leaves ranging from 10-38(-62) mm wide compared to 3-14 mm wide for C. striatula. Carex leptonervia has smaller perigynia (2.2-3.2 mm long compared to (3.4-)3.9-5.1 mm long for C. striatula) and less conspicuous and fewer (8-18 compared to (22-)25-32 for C. striatula) nerves on the perigynia. Carex blanda has the perigynia more densely overlapping on lateral spikes and has shorter terminal staminate spike peduncles. Carex styloflexa has perigynia spreading compared to ascending; lateral spikes 6-9(-15) mm long compared to 22-62 mm long; and it has longer peduncles of proximal lateral spikes (4.6-14 times as long as the spikes they subtend compared to 1.4-3.3(-5.3) times as long as the spikes they subtend for C. striatula) (Bryson and Naczi 2002).
Carex laxiflora is the closest to C. striatula. Carex striatula appears as a robust C. laxiflora except perhaps for leaf width. Additional work on these two species may reveal new information. Carex laxiflora has achenes 1.8-2.2(-3.4) mm long, perigynia (2.6-)3.2-4.1(-4.6) mm long, and terminal spikes 12-24(-34) mm long compared to achenes 2.2-2.8(-4.6) mm long, perigynia (3.4-)3.9-5.1 mm long; and terminal spikes 22-32(-36) mm long for C. striatula (Bryson and Naczi 2002).
The species has immature to mature fruit from late May through June. This is the best time to survey for the species.
The time of year you would expect to find Lined Sedge fruiting in New York.
Carex striatula Michx.
Some botanists question the distinctness of this species compared to C. laxiflora (Braun 1967, Gleason and Cronquist 1991, Weakley 2004).
Bryson, C.T. and R.F.C. Naczi. 2002. Carex Linnaeus sect. Laxiflorae (Kunth) Mackenzie. Pages 431-440 in Flora of North America Editorial Committee (editors), Flora of North America, north of Mexico, Volume 23, Magnoliophyta: Commelinidae (in part): Cyperaceae. Oxford University Press, New York, New York, USA. 608pp + xxiv.
Braun, E.L. 1967. The Vascular Flora of Ohio. Volume 1. The Monocotyledoneae: Cat-tails to Orchids. The Ohio State University Press, Cincinnati, Ohio. 464 pp.
Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.
Gleason, H.A., and A. Cronquist. 1963. Manual of vascular plants of northeastern United States and adjacent Canada. D. Van Nostrand Company, New York, NY. 810 pp.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.
Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. Albany, NY.
New York Natural Heritage Program. 2019. New York Natural Heritage Program Databases. Albany, NY.
Reschke, Carol. 1990. Ecological communities of New York State. New York Natural Heritage Program, New York State Department of Environmental Conservation. Latham, NY. 96 pp. plus xi.
Rhoads, Ann F. and Timothy A. Block. 2000. The Plants of Pennsylvania, an Illustrated Manual. University of Pennsylvania Press, Philadelphia, PA.
Weakley, A.S. 2004. Flora of the Carolinas, Virginia, and Georgia. Working draft of March 17, 2004. University of North Carolina, Chapel Hill, NC. 871pp. Currently published by the author and available on the web at (http://www.herbarium.unc.edu/flora.htm).
Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://www.nyflora.org/, Albany, New York
Information for this guide was last updated on: June 22, 2005
Please cite this page as:
New York Natural Heritage Program. 2019. Online Conservation Guide for Carex striatula. Available from: https://guides.nynhp.org/lined-sedge/. Accessed January 17, 2019.