Flora of North America species comparison

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Marsilea oligospora

Nelson's pepperwort, Pacific clover-fern water-clover, Pacific water-clover
Habit Plants forming dense clones.
Roots

arising at nodes.
Petioles

3.1–5.7 cm, sparsely pubescent.
Pinnae

6–15 × 5–14 mm, pilose.
Sori

14–20.
Sporocarp(s)

stalks erect, unbranched, attached at base of petiole, sometimes bent near apex, 5–10 mm.

Marsilea oligospora
Phenology Sporocarps produced summer–fall (Jun–Oct).
Habitat Around ponds and marshes, in wet depressions in sagebrush and less commonly on river margins
Elevation 700–2400 m (2300–7900 ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Marsilea oligospora recently has been resegregated from M. vestita (D. M. Johnson 1986), from which it differs consistently in its nodding sporocarps that lack a pronounced distal tooth and its pilose leaves and stems. Where their ranges overlap, M. oligospora also has longer sporocarp stalks than does M. vestita. Plants of this species were recently grown from spores 100 years old (D. M. Johnson 1985).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 2.
Parent taxa Marsileaceae > Marsilea
Sibling taxa
M. ancylopoda, M. macropoda, M. mollis, M. quadrifolia, M. vestita
Name authority Goodding: Bot. Gaz. 33: 66. (1902)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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