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Key to Commelina

Commelinaceae

Commelina

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(c) Valke, Dinesh - CC-BY-SA
(c) Krakowiak, Alaina - CC-BY
1 Spathes with margins free to the base; [introduced species, usually in weedy habitats].
(c) Shaw, Joey
  2 Spathes generally whitish or pale green toward the peduncle, with contrasting dark green veins; middle petal white or paler than the others; capsules with 2 locules (the third aborting); seeds rugose foveate-reticulate
  2 Spathes lacking contrasting veins; middle petal about the same color as the others; capsules with 3 locules; seeds reticulate or smooth to faintly alveolate.
(c) Valke, Dinesh - CC-BY-SA
    3 Spathes not at all to slightly falcate (the lower margin straight or very nearly so); upper cyme usually vestigial (rarely well-developed and 1-flowered); seeds smooth to faintly alveolate; peduncles of the spathes with hairs to 0.5 mm long
(c) Fleming, Gary P.
    3 Spathes usually distinctly falcate (the lower margin curved); upper cyme in larger spathes usually well-developed and 1-several-flowered; seeds deeply reticulate; peduncles of the spathes with hairs to 0.1 mm long.
(c) Fleming, Gary P.
      4 Leaf blades 1.5-5 (-8) cm long × 0.5-1 (-2.2) cm wide; capsules usually 5-seeded
      4 Leaf blades 6-14 cm long × 1-3.3 cm wide; capsules usually 1-2 seeded
(c) kcthetc1 - CC0
(c) Fleming, Gary P.
1 Spathes with margins fused basally; [native species, usually in natural habitats, or introduced and weedy].
(c) kcthetc1 - CC0
        5 Flowers peach-colored
(c) Fleming, Gary P.
        5 Flowers white and/or bluish.
(c) Spaulding, Dan - CC-BY-NC, permission granted to NCBG
          6 Leaf sheaths not auriculate at the summit, ciliate with coarse reddish-brown, white, or colorless hairs; middle petal blue, lilac, or lavender; [mostly of moist or wet soils].
(c) Fleming, Gary P.
(c) Ward, Scott G - CC-BY
(c) Ward, Scott G - CC-BY
             7 Perennial from horizontal rhizomes, often forming clonal patches of erect stems; leaf blades lance-oblong, 6-20 cm long, the apex acuminate; leaf margin and upper surface scabrous; plants lacking subterranean, cleistogamous flowers; [native, mostly of moist floodplain forests]
(c) Keesling, Jim - CC-BY-NC, permission granted to NCBG
(c) Léveillé-Bourret, Étienne - CC-BY-NC, permission granted to NCBG
             7 Annual from fibrous roots, the stem decumbent; leaf blades broadly elliptic-ovate, 1-9 cm long, the apex acute to obtuse; leaf margin and upper surface pubescent or glabrous; plants often bearing subterranean, cleistogamous flowers; [exotic, weedy].
(c) Spaulding, Dan - CC-BY-NC, permission granted to NCBG
(c) Spaulding, Dan - CC-BY-NC, permission granted to NCBG
               8 Capsule usually 5-seeded; sheaths usually with red hairs at summit; stamen filaments not winged
(c) Kansara, Parth - CC-BY
               8 Capsule usually 1-seeded; sheaths with re hairs at summit; stamen filaments winged
(c) Reala, Matt - CC-BY-NC, permission granted to NCBG
          6 Leaf sheaths prolonged upwards into auricles, ciliate with white hairs; middle petal white; plant perennial from thickened, fibrous roots, not forming clonal patches; [mostly of dry, sandy or rocky soil].
(c) Weakley, Alan
(c) McCormick, Carol Ann
                 9 Larger leaves (6-) 10-15 cm long, (1.1-) 1.5-4.0 cm wide (typically 3-6× as long as wide); spathes (2.0-) 2.5-3.6 cm long
                 9 Larger leaves 4-15 cm long, 0.4-1.4 cm wide (typically 5-12× as long as wide); spathes 1-3 cm long.
(c) Reala, Matt - CC-BY-NC, permission granted to NCBG
                   10 Spathes 1-2.5 cm long, 0.9-1.5 cm high along the adaxial side; leaves 4-10 cm long; [primarily of the Coastal Plain, especially on sandhills and dunes]
(c) Keesling, Jim - CC-BY-NC, permission granted to NCBG
(c) Keesling, Jim - CC-BY-NC, permission granted to NCBG
                   10 Spathes 2.5-3.0 cm long, 1.2-1.8 cm high along the adaxial side; leaves 7-15 cm long; [primarily midwestern and western]