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Support the Flora of the Southeastern US

2024 has been a banner year for making the best flora we can imagine. We've created:
With financial support from people like you, we are aiming even higher in 2025. Together we can accomplish all this: Vote on our 2025 priorities
  • Add Global Conservation Ranks (GRanks) vote
  • Professional graphic keys (polyclaves) to individual families/genera vote
  • 2 new FloraQuest apps: Florida & Mid-South vote
  • Image overlays highlighting diagnostic characters with arrows vote
  • iNaturalist integration in FloraQuest vote
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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Cyperus, Key B: Key to subgenus Kyllinga

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1 Scale keel conspicuously winged, laciniate; anthers 2 mm long; achenes ca. 1.2 mm wide, ovate to nearly orbicular; fibrous-rooted annual; [section Kyllinga]
1 Scale keel toothed or entire; anthers <2 mm long; achenes 0.5-1 mm wide, elliptic to obovate or oblong; perennials (except C. hortensis); [section Brevifoliae].
  2 Plants with culms arising singly along a scaly, creeping rhizome; spikes green.
    3 Central spike 8-10 mm wide, globose, solitary; inflorescence bracts deflexed to spreading (divaricate); style 0.6-1.2 mm long; anthers 2-3; scale keel entire
    3 Central spike 3-7 mm wide, ovoid to oblong, often branched; longest inflorescence bract held vertical on most culms; style 1.8-2.2 mm long; anther 1; scale keel denticulate
  2 Plants cespitose or with very slender, easily broken stolons and cormose culm bases; spikes white (except C. hortensis).
      4 Spikes green; plants cespitose, fibrous-rooted annuals; scale keels denticulate; achene light brown, oblong, 2× as long as wide
      4 Spikes whitish; plants cespitose or stoloniferous perennials; scale keels entire; achenes various.
        5 Mature achene light brown, oblong to obovate; plants reproducing by very slender, easily broken stolons; spikes ovoid to pyramidal.
        5 Mature achene black, with whitish (pale) stipe and apiculus, broadly elliptic; plants cespitose; larger (central) spikes oblong to cylindric.