| Section 1 » Order Isoetales » Family Isoetaceae |
Show/Hide Synonym
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| Isoetes engelmannii | < | Isoetes engelmannii | Gleason and Cronquist (1991) | | | Isoetes engelmannii | < | Isoetes engelmannii | Gleason (1952) | | | Isoetes engelmannii | < | Isoetes engelmannii | Flora of North America (1993b, 1997, 2000, 2002a, 2002b, 2003a, 2004b, 2005, 2006a, 2006b, 2006c, 2007a, 2009, 2010) | | | Isoetes engelmannii | < | Isoetes engelmannii | | | | Isoetes engelmannii | < | Isoetes engelmannii | Radford, Ahles, and Bell (1968) | | | Isoetes engelmannii | < | Isoetes engelmannii | Wofford (1989) | | | Isoetes engelmannii | < | Isoetes engelmannii | Flora of West Virginia | (also see I. appalachiana | | Isoetes engelmannii | < | Isoetes engelmannii | | | | Isoetes engelmannii | < | Isoetes engelmannii | | | | Isoetes engelmannii | < | Isoetes engelmannii var. engelmannii | Fernald (1950) | | | Isoetes engelmannii | < | Isoetes engelmannii var. engelmannii | Small (1933, 1938) | | | Source: Weakley's Flora |
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| Author | A. Braun | |
| Distribution | Nearly statewide, but absent in the northern Coastal Plain. This is the most widespread and numerous quillwort in the state. NOTE: specimen records from the Coastal Plain (Robeson County and eastward) are probably all I. appalachiana; they need to be annotated; see that species for discussion.
This is a rather widespread species in the East, ranging from southern ME and MI south to southern GA and northeastern MS. It is certainly under-collected over this range.
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| Abundance | Fairly common in the southern Mountains, and uncommon to infrequent in the Piedmont. Probably very rare to absent in the Coastal Plain (all records need vetting). There are numerous records for southeastern VA, which suggests it could be present in most northeastern NC counties; however, all such records of "I. engelmannii" need to be carefully vetted. The website editors suggest that both ranks are somewhat conservative, as it certainly should have a Global Rank of G5, and a State Rank at least S4, if the much more scarce I. appalachiana is ranked by NCNHP as S3). | |
| Habitat | This species is "Most commonly submerged in streams and ponds, but also emergent in seepage areas, wet ditches, and depressions" (Digital Atlas of the Virginia Flora website). | |
| Phenology | Fruits from May to October. | |
| Identification | All Isoetes species are quite grass-like, with numerous very slender and grass-like leaves growing from a common base. Most importantly, they are swollen at the base, where the megaspores are present, the key structure for separation of species. The leaves are terete (rounded) and hollow. For identification, see the key in Weakley (2018). | |
| Taxonomic Comments | This has always been a good, named species, but it contained other species which have later been pulled out as separate species, such as I. appalachiana (in 1997).
All Isoetes species are quite grass-like, with numerous very slender and grass-like leaves growing from a common base. Most importantly, they are swollen at the base, where the megaspores are present, the key structure for separation of species. The leaves are terete (rounded) and hollow. For identification, see the key in Weakley (2018). | |
| Other Common Name(s) | Appalachian Quillwort, but this was a/the primary common name until I. appalachiana was described and thus "took" that common name, leaving Engelmann's Quillwort the obvious common name in use now. | |
| State Rank | S4 [S4S5] | |
| Global Rank | G4 [G5] | |
| State Status | | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
