Rock Quillwort / Center For Plant Conservation
Search / Plant Profile / Isoetes lithophila
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
  • Lifeform: Graminoid
  • 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

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

Be the first to post an update!

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


Donate to CPC to Save this Species

CPC secures rare plants for future generations by coordinating on-the-ground conservation and training the next generation of plant conservation professionals. Donate today to help save rare plants from extinction.

Donate Today