Jepson Flora Project: Jepson Interchange    
 

The Jepson Manual: Higher Plants of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

Names are linked to treatments from the Manual


Key to SPARGANIUM

N.B.: couplets are linked, e.g., 1. is linked to 1'.

  1. Plant 10–26 dm, generally emergent; inflorescence axis generally branched; stigmas 1–2; fruit sessile, obconic, 6–10 mm, top truncate or dome-like, beaked
 
    2. Fruit top dome-like; fruit 4–7 mm, 2.5–5 mm wide; many flowers with 1 stigma; many ovaries 1-chambered
S. erectum subsp. stoloniferum
    2' Fruit top truncate to slightly rounded; fruit 6–10 mm, 6–8 mm wide; many flowers with 2 stigmas; many ovaries 2-chambered
S. eurycarpum subsp. eurycarpum
  1' Plant 1–8 dm, submersed or emergent; inflorescence axis simple; stigma 1; fruit stalked, slender, fusiform to elliptic or oblanceolate, sometimes narrowed at middle, 3–5.5 mm; beak 0
 
    3. Plant generally emergent; stem ± stiff, erect; leaves and lower inflorescence bracts 3–12 mm wide, keeled or triangular below middle; inflorescence 12–25 mm diam in fruit
S. emersum subsp. emersum
    3' Plant generally submersed; stem ± flexible, floating above; leaves and lower inflorescence bracts 1–5 mm wide, flat or sides convex, not keeled or triangular; inflorescence 5–15 mm diam in fruit
 
      4. Lowest inflorescence bract < 20(60) cm, >> inflorescence; staminate inflorescence generally 2+; pistillate inflorescence generally 7–15 mm diam in fruit, some pistillate inflorescences on separate peduncle; fruit 3.5–5 mm, 2–2.5 mm wide
S. angustifolium
      4' Lowest inflorescence bract < 2 cm, ± = inflorescence; staminate inflorescence generally 1; pistillate inflorescence 7–10 mm diam in fruit; fruit 2–4 mm, 1–2.5 mm wide
S. natans


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