Flora of the Hawaiian Islands
Pteridophyte Literature for Ophioglossum petiolatum
Palmer, 2003.
   Ophioglossaceae -- The Adder's Tongue Family Bibliography
      Ophioglossum petiolatum

Common name(s): adder's tongue
General Information
DistributionWidespread in the southern United States and tropical regions worldwide.In the Hawaiian Islands, indigenous to Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.

Click here for detailed USGS map by Jonathan Price
HabitatGreenhouses, flowerpots, and lawns in urban areas
Elevation6-950 m
Rhizomes cylindrical, 1.5-3.5 mm diameter, roots up to 8 per plant, 0.8-1.3 mm diameter, dark brown, stubble of old stipe bases absent, usually with 1 living frond.
Fronds upright, arising above ground surface, mostly 2-6 cm (rarely up to 10 cm) long; sterile blades elliptic-ovate or lanceolate-ovate, tips acute, upright, arising above ground surface, commonly somewhat folded when alive; veins reticulate, forming areoles; fertile spikes 1-2 (-6) x as long as sterile blade, with up to 30 or more pairs of sporangia.
Latin petiolus, petiole, little foot, stalk, stem.
Sally Eichhorn