Flora of the Southeastern United States
2022 Edition

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Key to Narcissus

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.

1 Perianth lobes 10-15 mm long; corona 3-5 mm long; leaves dark green, either cylindrical and hollow or somewhat flattened and grooved; umbel (or spathe, or stem) with 3-10 flowers.
..2 Leaves somewhat flattened, grooved, 3-10 mm wide; tepals light lemon-yellow; corona yellow-orange, distinctly darker than the tepals
..2 Leaves cylindrical (terete), 2-4 mm wide; tepals golden-yellow; corona golden-yellow, the same as the tepals or only slightly darker
1 Perianth lobes 20-50 mm long; corona 5-50 mm long; leaves usually glaucous, flattened, solid; umbel (or spathe, or stem) with 1-4 flowers.
....3 Hypanthial tube (below the tepals) parallel-sided (though sometimes suddenly expanded at its apex); corona < 10 mm long, usually wider than high; corona < 0.5× as long as the perianth lobes; corona rarely undulate; umbel (or spathe, or stem) with 1-10 flowers; stamens of 2 distinct lengths.
......4 Corona rim red, contrasting with the white or yellow corona (though sometimes fading when dried); umbel (or spathe, or stem) with 1 flower
......4 Corona of a single color, all white or yellow; umbel (or spathe, or stem) with (1-) 2-8 (-20) flowers.
........5 Umbel (or spathe, or stem) with (1-) 2 (-3) flowers; pollen sterile
........5 Umbel (or spathe, or stem) with (2-) 3-8 (-20) flowers; pollen fertile.
..........6 Corona white; umbel (or spathe, or stem) with <20 flowers
..........6 Corona yellow; umbel (or spathe, or stem) with (2-) 3-8 (-15) flowers
....3 Hypanthial tube (below the tepals) distinctly widening toward its apex; corona usually > 10 mm long, usually as long as wide or longer than wide; corona > 0.5× as long as the perianth lobes; corona margin undulate; umbel (or spathe, or stem) with 1 flower; stamens of the same length or nearly so.
............7 Tepals linear to lanceolate, < 5 mm wide
............7 Tepals ovate, triangular-ovate, or suborbicular, > 10 mm wide.
..............8 Corona 30-50 mm long, about as long as the perianth lobes
..............8 Corona 10-25 mm long, distinctly shorter than the perianth lobes.
................9 Umbel (or spathe, or stem) with 1 flower; corona usually conspicuously darker in color than the tepals; leaves somewhat glaucous, > 8 mm wide; stem distinctly2-edged
................9 Umbel (or spathe, or stem) with (1-) 2-4 flowers; corona and tepals the same color; leaves green, < 8 mm wide; stem nearly terete