Isoëtes butleri

Engelmann

Bot. Gaz. 3: 1. 1878.

Common names: Butler's quillwort
Treatment appears in FNA Volume 2.

Plants terrestrial. Rootstock nearly globose, 2-lobed. Leaves deciduous, dull green to gray-green or yellow green, pale toward base, spirally arranged, to 15 (–30) cm, pliant, tapering gradually to tip. Velum covering less than 1/4 of sporangium. Sporangium wall ± brown-streaked. Megaspores white, (360–) 480–650 μm diam., obscurely tuberculate; girdle obscure. Microspores light-brown in mass, 27–37 μm, papillose. 2n = 22.


Phenology: Spores mature in late spring.
Habitat: Calcareous soil, limestone cedar glades, barrens

Distribution

V2 620-distribution-map.gif

Ala., Ark., Ga., Ill., Kans., Ky., Mo., Okla., Tenn., Tex.

Discussion

Population of Isoëtes butleri is locally abundant in open areas on alkaline soils saturated by water from early spring rains. The leaves yellow, wither, and disappear by late spring.

Selected References

None.

Lower Taxa

None.
... more about "Isoëtes butleri"
several +  and 1 +
W. Carl Taylor +, Neil T. Luebke +, Donald M. Britton +, R. James Hickey +  and Daniel F. Brunton +
Engelmann +
Butler's quillwort +
alternating +
Ala. +, Ark. +, Ga. +, Ill. +, Kans. +, Ky. +, Mo. +, Okla. +, Tenn. +  and Tex. +
Calcareous soil, limestone cedar glades, barrens +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
pale +, green +  and gray-green or yellow green +
straight +
deciduous +
recurved;erect;spreading +
tapering +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
deltate;cordiform +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
tuberculate +
Spores mature in late spring. +
branched +  and simple +
2-lobed +  and globose +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Isoëtes butleri +
Isoëtes +
species +
brown-streaked;completely brown +
ephemeral +, evergreen +  and perennial +