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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Plant free-floating or stranded on mud, generally 1–5 cm, often fan-shaped; roots pendent from stem forks, unbranched.
Stem: forked repeatedly or pinnate, thread-like, easily fragmented at joints.
Leaf: alternate, in 2 rows, sessile, often overlapped, 0.5–1.5 mm, seemingly paired but actually of 2 ± round to ovate lobes; upper lobe floating or emergent, thick, ± green or ± red, margin ± white, adaxial surface smooth or generally with papillae; lower lobe submersed, generally ± larger, thinner, ± white.
Sporangia: in seemingly axillary cases of 2 kinds, cases generally in pairs of 1 kind.
Male sporangium case: 1.2–2 mm diam, spheric; tip dark-pointed; wall transparent; sporangia generally 20–100+, long-stalked; spores 32 or 64, spheric, in generally 3–6 barbed masses.
Female sporangium case: 0.2–0.4 mm diam, hemispheric or spheric; tip obtuse, covered by dark, conic, spongy structures that aid in flotation; wall ± opaque; sporangium 1, sessile; spore 1, spheric.
1 genus, ± 6 species: ± worldwide. When Salvinia and Azolla in same family, the name is Salviniaceae. —Scientific Editor: Thomas J. Rosatti.
Unabridged note: Barbs evidently on neither sporangia nor spores, but on cells surrounding spore masses. If Salvinia is included in the same family with Azolla, as is sometimes done, the name for the inclusive family would be Salviniaceae.
(Greek: dry kill, from plant death in dried habitats) [Reid et al. 2006 Int J Plant Sci 167:529–538] Used as green manure in rice paddies because of nitrogen-fixing algae in upper leaf lobe; species identification difficult, depends in part on fertile material (generally 0 on herbarium specimens). Spp. hybridize in culture.Key to Azolla
Unabridged references: [Perkins et al. 1985 Scanning Electron Microscopy 1985(IV):1719–1734; Evard & Van Hove 2004 Syst. Geogr. Plant. 74:301–318]
Unabridged note: Evard & Van Hove (2004) treated Azolla microphylla as a synonym of Azolla filiculoides, suggesting that plants here called Azolla microphylla might instead belong to Azolla cristata Kaulf., although no CA material was referred to this sp. by them.
Previous taxon: Azollaceae
Next taxon: Azolla filiculoides
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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|Bioregions in which taxon occurs||Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon;|
markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records.
Data provided by the participants of the Consortium of California Herbaria.
Note: About half of the CCH records include both elevation and coordinates.
|Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria.
View all CCH records