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Key to Steironema

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1 Leaves linear, 1-7 mm wide, 10-20× longer than wide, mid-cauline leaves sessile or short petiolate, petioles when present 1-5 mm long.
  2 Stems 2-10 dm tall; petioles with cilia at base only, rarely ciliate their entire length, cilia not extending onto margins of leaf bases; flowers 16-26 mm in diameter
  2 Stems 1-3 dm tall; petioles ciliate their full length with cilia usually extending distally onto margins of leaf base; flowers 7-20 mm in diameter.
    3 Leaves 1-2 (-3) mm wide; flowers 7-14 mm in diameter
    3 Leaves 3-7 mm wide; flowers 11-20 mm in diameter
1 Leaves lanceolate, narrowly elliptic-lanceolate, or narrowly oblong, 5-60 mm wide, mostly 1.5-10× longer than wide, mid-cauline leaves usually with well-developed petioles 5-20+ mm long (except in L. lanceolata where petioles are mostly <5 mm long).
      4 Petioles ciliate along their entire length.
        5 Leaves narrowly oblong, elliptic, lanceolate, or oblanceolate, 5-20 mm wide.
          6 Plants lacking creeping rhizomes; stem bases usually somewhat swollen and >4 mm in diameter, often with adventitious roots; leaf bases mostly rounded to broadly cuneate; petioles ciliate mostly only in basal half but sometimes with a few cilia extending into distal half of petiole; plants of wetlands
          6 Plants with well-developed long-creeping rhizomes; stem bases not swollen, <4 mm in diameter, lacking adventitious roots; leaf bases cuneate; petioles evenly ciliate from petiole base to apex and extending onto lower leaf edge; plants of mesic to dry sites, rarely of wet areas
      4 Petioles eciliate or with cilia confined to the proximal half (or less) only.
             7 Stems decumbent to prostrate and often rooting at the nodes; corolla lobes 3-5 mm long
             7 Stems erect or sometimes reclining on other vegetation but not prostrate and rooting at the nodes; corolla lobes 5-12 mm long.
               8 Cilia extending up proximal half of petioles; plants of wetlands to mesic forests; stem bases usually somewhat swollen and often with adventitious roots
               8 Cilia absent from petioles (or only extending 2-3 mm up the petiole), restricted to the nodal region between opposing petiole bases; plants of dry to mesic upland habitats; stem bases not swollen, lacking adventitious roots.
                 9 Leaves narrowly lanceolate, bases cuneate and generally gradually contracted to the petiole, widest point located near the middle to just below the middle of the blade, 4-9× longer than wide, mid-cauline leaves 5-12 mm wide
                 9 Leaves ovate to ovate-lanceolate, bases rounded to truncate, abruptly contracted to the petiole, widest point located in the proximal one-quarter to one-third of the blade, 1.5-4.5× longer than wide, mid-cauline leaves 15-44 mm wide
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