Home/Species/ True Quillwort

Isoetes valida

(Engelm.) Clute

True Quillwort

G4Apparently Secure (G4?) Found in 1 roadless area NatureServe Explorer →

G4Apparently SecureGlobal Rank

Identity

Unique IDELEMENT_GLOBAL.2.141084

Element CodePPISO01210

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

KingdomPlantae

PhylumLycophyta

ClassIsoetopsida

OrderIsoetales

FamilyIsoetaceae

GenusIsoetes

Other Common Names

strong quillwort (EN) Strong Quillwort (EN)

Concept Reference

Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

Taxonomic Comments

As recognized in Kartesz (1999) and Weakley et al. (2024), following Brunton and Britton (1996), Isoetes valida includes plants formerly considered I. caroliniana (= I. engelmannii var. caroliniana) and I. engelmannii var. valida; I. valida has priority as the older name. Kartesz (1994) and FNA (1993, vol. 2) included I. engelmannii var. valida / I. valida in I. engelmannii and recognized I. caroliniana as distinct.

Conservation Status

Review Date1997-10-09

Change Date1997-10-09

Ecology & Habitat

Other Nations (1)

United StatesN4

Province	Rank	Native
Georgia	S2	Yes
Delaware	SH	Yes
West Virginia	S1	Yes
Mississippi	S2	Yes
Pennsylvania	S2	Yes
South Carolina	S1	Yes
Virginia	S4	Yes
North Carolina	S3	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (1)

Louisiana (1)

Area	Forest	Acres
Saline Bayou W & S River Corridor	Kisatchie National Forest	5,355

References (4)

Flora of North America Editorial Committee (FNA). 1993a. Flora of North America north of Mexico. Vol. 2. Pteridophytes and gymnosperms. Oxford Univ. Press, New York. xvi + 475 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Weakley, A.S., and Southeastern Flora Team. 2024. Flora of the southeastern United States. Edition of March 4, 2024. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. 2203 pp.