Botrychium Swartz

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 8-9

2. Botrychium Swartz 3

Lamina usually compound, 1 - to 4-pinnate, rarely simple, oblong to triangular, somewhat fleshy, with dichotomous free veins. Fertile spikes always compound, with subsessile free sporangia in two rows.

1 Lamina oblong, ovate or triangular-ovate, longer than wide, almost glabrous

2 Lamina simple, trilobed, or pinnate; pinnae with dichotomous veins and without midrib

3 Lamina petiolate, simple or trilobed or pinnate, with

2(-4) pairs of pinnae 1. simplex 3 Lamina sessile, always pinnate, with (2)3-9 pairs of pinnae

2. lunaria 2 Lamina 2-pinnate; segments with ± conspicuous midrib

4 Segments about as long as wide, triangular to rhomboid or ovate 3. boreale 4 Segments longer than wide, lanceolate to oblong (if wider,

then pinnatifid)

5 Segments acute, lanceolate to linear-lanceolate, with pronounced midrib 5. lanceolatum 5 Segments obtuse, ovate to oblong, with somewhat inconspicuous midrib 4. matricariifoiium

1 Lamina broadly triangular, wider than long, hairy at least when young.

6 Laminafleshy,petiolate,2 - to3 -pinnate; segmentsobtuse

6. multifldum 6 Laminamembranous,sessile,3 - to4 -pinnate; segmentsacute

7. virginianum