Rock Quillwort - Center For Plant Conservation
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Plant Profile

Rock Quillwort (Isoetes lithophila)

Photo Credit: Bill Carr
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Isoetaceae
  • State: TX
  • Nature Serve ID: 147798
  • Date Inducted in National Collection: 06/25/2002

Where is Rock Quillwort (Isoetes lithophila) located in the wild?


ephemeral pools on granitic and other igneous substrates



States & Provinces:

Rock Quillwort can be found in Texas

Which CPC Partners conserve Rock Quillwort (Isoetes lithophila)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

Nature Serve Biotics
  • 05/02/2017

Endemic to Llano, Mason, and Burnet counties on the Edwards Plateau in Texas. Requires a specialized, ephemeral habitat: pools on granite outcrops which retain water long enough to allow plants to reach maturity. Granite quarries threaten some sites.

  • 01/01/2010

10 known populations; including Enchanted Rock State Natural Area

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Taxon Isoetes lithophila
Authority N. Pfeiffer
Family Isoetaceae
CPC Number 2344
ITIS 503214
Common Names Rock Quillwort
Associated Scientific Names Isoetes lithophila
Distribution NA
State Rank
State State Rank
Texas S2
Ecological Relationships


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