Cyperus retrofractus (Linnaeus) Torrey. Common name: Rough Flatsedge. Phenology: Jul-Sep. Habitat: Dry sandy or rocky woodlands and fields. Distribution: NJ west to s. OH, and se. MO, south to FL, GA, AL, and TX.
ID notes: C. lancastriensis is occasionally confused with this species, which, unlike other members of the C. retrofractus complex, often has multiple fertile scale; C. lancastriensis has spikelet reflexed only in the proximal half of the spike, lacking prolonged, involute terminal scale, and oblong-falcate (vs. narrowly oblong and straight) achene.
Origin/Endemic status: Endemic
Taxonomy Comments: See Carter and Jarvis (1986) for clarification of nomenclature.
Synonymy ⓘ: = Ar, C, FNA23, K4, Mo1, NS, Pa, POWO, Tn, Tx, Va, WH3; = Cyperus dipsaciformis Fernald — F, RAB, S, Tat, W; = Cyperus retrofractus (L.) Torr. var. dipsaciformis (Fernald) Kük. — G; Scirpus retrofractus Linnaeus. Basionym: Scirpus retrofractus L. 1753
Links to other floras: = Cyperus retrofractus - FNA23
Show parent genus | Show parent in key(s)
Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: FACU (taxonomic split from wetland indicator species)
- Eastern Mountains and Piedmont: UPL (taxonomic split from wetland indicator species)
- Great Plains: UPL (taxonomic split from wetland indicator species)
- Midwest: UPL (taxonomic split from wetland indicator species)
- Northcentral & Northeast: UPL (taxonomic split from wetland indicator species)
Heliophily ⓘ: 8
Hover over a shape, letter, icon, or arrow on the map for definition or see the legend.
© Gary P. Fleming | Original Image ⭷
© Keith Bradley | Original Image ⭷
© Gary P. Fleming | Original Image ⭷
© Scott Ward | Original Image ⭷
© theo_witsell, some rights reserved (CC BY-NC), uploaded by theo_witsell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
© theo_witsell, some rights reserved (CC BY-NC), uploaded by theo_witsell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
© Radford, Ahles and Bell | Original Image ⭷Feedback
See something missing or incorrect about Cyperus retrofractus? Let us know here:
- Please include your name and if possible, email in case when need to clarify what you wrote.
- If you opt out of including email, please be as specific as possible (e.g., which photo is incorrect?)
- Please do not submit questions asking to identify plants or about horticultural topics (e.g., how do I control an invasive plant in my garden?). Instead, those questions can be submitted here for the Carolinas region only.
- Please do not send us feedback about unkeyed species as this work is ongoing.
- Please allow time for flora edits to show in our next data release. We greatly appreciate your feedback but may require extra time to research complicated taxonomic issues.
Horticultural Information
Intro:
Stems:
Leaves:
Inforescence:
Flowers:
Fruits:
Comments:
Height:
plant sale text:
bloom table text:
description:
stems:
leaves:
inflorescence:
flowers:
fruits:
comments:
cultural notes:
germination code:
native range:
0 unsaved edits on this page.