Isoetes howellii
| Isoetes howellii | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Lycopodiophyta |
| Class: | Isoetopsida |
| Order: | Isoetales |
| Family: | Isoetaceae |
| Genus: | Isoetes |
| Species: | I. howellii |
| Binomial name | |
| Isoetes howellii Engelm. | |
| Synonyms | |
| |
Howell's quillwort (Isoetes howellii) is a species of quillwort, a type of lycopod. It is an aquatic plant native to western North America and grows in wet habitats such as vernal pools. It produces 5 to 28 pointed, cylindrical, bright green leaves that can reach 30 centimeters in length. The velum covers roughly one third of the spherical sporangia, which is 6 millimeters long. The ligule is in the shape of an elongated triangle. The megaspores are 420 to 610 micrometers in diameter. The coarse microspores are 25 to 30 micrometers long.[1] It is closely related to I. melanopoda and was first thought to be a variation of that species.
References
- ↑ Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.
External links
This article is issued from Wikipedia - version of the 5/26/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.