CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record azolla_microphylla - Tue, Nov. 30, 2021 17:08 ET c
Azolla microphylla
common nameMexican mosquito fern
CalPhotos image
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life formannual/perennial herb
CA Rare Plant Rank
List 4.2
LIST 4: Limited distribution (Watch List).
     0.2: Fairly endangered in California
state rank
S4      ranking system key
global rank
G5     G5: demonstrably secure to ineradicable
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Counties, states, regions:
Butte (BUT), Colusa (COL), Glenn (GLE), Inyo (INY), Kern (KRN), Lake (LAK), Modoc (MOD), Nevada (NEV), Plumas (PLU), San Bernardino (SBD), Santa Clara (SCL), San Diego (SDG), Tulare (TUL), Arkansas (AR), Arizona (AZ), Baja California (BA), Colorado (CO), Isla Guadalupe - Baja (GU), Iowa (IA), Idaho (ID), Illinois (IL), Kansas (KS), Minnesota (MN), Missouri (MO), Montana (MT), Nebraska (NE), New Mexico (NM), Nevada (NV), Oklahoma (OK), Oregon (OR), Texas (TX), Utah (UT), Washington (WA), Wisconsin (WI)
  • Pending additional quad-level data, only county data are being provided for List 4 plants.
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Marshes and swamps (MshSw)(ponds, slow water)
blooming period Aug  
elevation range30 - 100 meters
Too common? Difficult to distinguish from A. filiculoides, which is common. See American Fern Journal 34(3):69-84 (1944) for a review of New World Azolla.
full nameAzolla microphylla Kaulf.
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym   Element Code  PPAZO01030
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
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Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Tue, Nov. 30, 2021 from

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