Difference between revisions of "Isoëtes engelmannii"
Flora 29: 178. 1846.
FNA>Volume Importer |
imported>Volume Importer |
||
| (3 intermediate revisions by 2 users not shown) | |||
| Line 12: | Line 12: | ||
|name=Isoëtes valida | |name=Isoëtes valida | ||
|authority=(Engelmann) Clute | |authority=(Engelmann) Clute | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Isoëtaceae;Isoëtes;Isoëtes engelmannii | |hierarchy=Isoëtaceae;Isoëtes;Isoëtes engelmannii | ||
| Line 36: | Line 37: | ||
-->{{#Taxon: | -->{{#Taxon: | ||
name=Isoëtes engelmannii | name=Isoëtes engelmannii | ||
| − | |||
|authority=A. Braun | |authority=A. Braun | ||
|rank=species | |rank=species | ||
| Line 50: | Line 50: | ||
|publication year=1846 | |publication year=1846 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V2/V2_513.xml |
|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes engelmannii | |species=Isoëtes engelmannii | ||
Latest revision as of 20:23, 5 November 2020
Plants aquatic, emergent. Rootstock nearly globose, 2-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged, to 60(–90) cm, pliant, gradually tapering to tip. Velum covering less than 1/4 of sporangium. Sporangium wall usually unpigmented, occasionally ± brown-streaked. Megaspores white, 400–560 μm diam., reticulate, with unbroken lamellate ridges; girdle obscure. Microspores gray in mass, 20–30 μm, smooth to papillose. 2n = 22.
Phenology: Spores mature in summer.
Habitat: Emergent or in shallow water of lakes, ponds, streams, and ditches
Distribution
Ont., Ala., Ark., Conn., Del., Fla., Ga., Ill., Ind., Ky., Md., Mass., Mich., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va.
Discussion
Isoëtes engelmannii is the most widely distributed quillwort of eastern North America. Plants with larger megaspores, ranging from 480–560 μm, have been called I. engelmannii var. georgiana Engelmann. This variety may represent a tetraploid cytotype. A tetraploid population of I. engelmannii (2n = 44) from northern Florida has larger megaspores characteristic of var. georgiana.
Isoëtes engelmannii hybridizes with I. echinospora [ = I. x eatonii Dodge (later synonym = I. x gravesii A. A. Eaton); I. flaccida; I. tuckermanii [ = I. x foveolata A. A. Eaton ex Dodge]; I. lacustris; and I. riparia [ = I. x brittonii Brunton & W. C. Taylor].
Selected References
None.