Pagina 52 - Flora of the Southern Carnic Alps

52
157
No green stem ending
in a spore-bearing
spike. (fertile stems
without chlorophyll
develop at the end of
winter and disappear
when the sterile green
stems emerge)
158
157
At least some stems
ending in a spore-
bearing spike.
159
158
Sheaths with 8-12
teeth. Stems 10-50 cm
tall and 1-5 mm wide,
with a narrow central
cavity
Equisetum arvense
L.
158
Sheaths with 20-30
teeth. Stems 50-200
cm tall and 1-2 cm
wide, with a wide
central cavity
Equisetum
telmateia Ehrh.
159 Sporiferous spikes
acute at the top 160
159
Sporiferous spikes
rounded or obtuse at
the top
162