Jepson eFlora
Key to families | Table of families and genera

Key to Schoenoplectus

View taxon page for Schoenoplectus

1. Stem 3-sided, at least near inflorescence, where sometimes obscure

2. Inflorescence panicle-like ..... S. californicus

2A. Inflorescence head-like or spikelet 1 ..... [S. triqueter] (2)

2A' Inflorescence panicle-like (or spikelet 1)

2B. Plant 1–4 m; stem 4–10 mm diam, blunt-3-sided throughout to cylindric proximally, obscure-3-sided near inflorescence; spikelets 25–150+; perianth bristles 2–4, soft-hairy ..... S. californicus

2B' Plant 0.5–1.5 m; stem 2–4 mm diam, 3-sided; spikelets 1–35; perianth bristles 4–6, barbed ..... [S. triqueter] (2)

2' Inflorescence head-like or spikelet 1

3. Leaf blades 0; flower bract tips not notched; fruit with many wavy transverse ridges; plant tufted, rhizomes short, inconspicuous ..... S. mucronatus

3' Leaf blades 1–6; flower bract tips notched; fruit smooth; plant mat-forming, rhizomes long, conspicuous

4. Distal leaf blade < 1.5 × sheath; flower bract tip notch 0.1–0.4 mm, awn 0.2–0.6 mm ..... S. americanus

4' Distal leaf blade (1)2–5 × sheath; flower bract tip notch (0.3)0.5–1 mm, awn 0.5–2.5 mm ..... S. pungens var. longispicatus

1' Stem cylindric

5. Stem <= 1.5 mm diam; plant to 1.5 m; flower bract tip notch 0; spikelets 1–20

6. Spikelets 1–20, spreading; fruit with sharp wavy transverse ridges; plant tufted, rhizomes short, generally not evident ..... S. saximontanus

6' Spikelets 1, erect; fruit smooth; plant mat-forming, rhizomes long, evident ..... S. subterminalis

5' Stem 2–10 mm diam; plant to 4 m; flower bract tip notch present; spikelets 3–100+

7. Flower bract awns some or all markedly contorted, 0.5–2 mm (often broken off); spikelets 3–100+, in clusters of 1–8, not all 1 on 1 plant ..... S. acutus var. occidentalis

7' Flower bract awns not or ± contorted, 0.2–1 mm; spikelets 5–200, in clusters of 1(2) or 1–4(7), all 1 on 1 plant or not

8. Fruit 3-sided, 1.8–2.2 mm; stigmas 3; spikelets in clusters of 1(2) ..... S. heterochaetus

8' Fruit 2-sided, 1.5–1.8 mm; stigmas 2(3); spikelets in clusters of 1–4(7) ..... S. tabernaemontani

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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