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Magnoliopsida
Podostemaceae Rich. ex Kunth
EOL Text
Submerged, annual or perennial, herbs, growing firmly attached to rocks in swift-flowing water, often resembling mosses, liverworts or algae. Stems well-developed, floating, often woody. Leaves with floating, often linear to filiform, dissected laminae and/or with small moss-like or reduced and bract-like ones. Flowers bisexual, solitary or cymose, actinomorphic or zygomorphic. Spathella present and persistent (Sphaerothylax) or 0 (Tristicha). Perianth segments 2-3 or 0. Stems 1-many. Ovary 1-3-locular. Fruit a septicidal capsule. Seeds minute, numerous.
Barcode of Life Data Systems (BOLD) Stats
Specimen Records:941
Specimens with Sequences:938
Specimens with Barcodes:809
Species:232
Species With Barcodes:231
Public Records:932
Public Species:230
Public BINs:0
Podostemaceae (riverweed family) is a family in the order Malpighiales. It comprises about 50 genera and 250 species of more or less thalloid aquatic herbs.
Riverweeds adhere to hard surfaces (generally rock) in rapids and waterfalls of rivers. They are found mostly in tropical and subtropical areas world-wide.[2] Many species are found in a very small geographic area (perhaps even just a single river or waterfall).[3] Riverweeds are submerged when water levels are high, but during the dry season they live a terrestrial existence, flowering at this time. Their root anatomy is specialized for the purpose of clinging to rocks, and in fact details of the root structure are one of the ways of classifying riverweeds.[4]
The Podostemaceae are related to the families Clusiaceae, Hypericaceae (the St. John's wort family, which is sometimes treated as a subfamily of Clusiaceae), and Bonnetiaceae.[5][6]
Genera[edit]
- Angolaea
- Apinagia
- Butumia
- Castelnavia
- Ceratolacis
- Cipoia
- Cladopus
- Dalzellia
- Devillea
- Dicraeanthus
- Dicraeia
- Diplobryum
- Djinga
- Endocaulos
- Farmeria
- Griffithella
- Heterotristicha
- Hydrobryum
- Indotristicha
- Jenmaniella
- Ledermanniella
- Leiothylax
- Letestuella
- Lonchostephus
- Lophogyne
- Macarenia
- Macropodiella
- Malaccotristicha
- Marathrum
- Mniopsis
- Monostylis
- Mourera
- Oserya
- Paleodicraeia
- Podostemum
- Pohliella
- Polypleurella
- Polypleurum
- Rhyncholacis
- Saxicolella
- Sphaerothylax
- Stonesia
- Thelethylax
- Torrenticola
- Tristicha
- Tulasneantha
- Vanroyenella
- Weddellina
- Wettsteiniola
- Willisia
- Winklerella
- Zehnderia
Moved to other genera[edit]
- Hydrostachys from Madagascar. This genus seems to have relatively little in common with any other, and no affinity to the Podostemaceae except being aquatic; moved to its own family in the Cornales.
See also[edit]
Eugenius Warming, a botanist who studied the family
References[edit]
- ^ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 2013-07-06.
- ^ "Podostemales". Encyclopædia Britannica Online.
- ^ "Podostemaceae". Institute of Systematic Botany, University of Zurich.
- ^ Satoshi Koi, Rieko Fujinami, Namiko Kubo, Ikue Tsukamoto, Rie Inagawa, Ryoko Imaichi and Masahiro Kato (2006). "Comparative anatomy of root meristem and root cap in some species of Podostemaceae and the evolution of root dorsiventrality". American Journal of Botany 93 (5): 682–692. doi:10.3732/ajb.93.5.682. PMID 21642132.
- ^ Gustafsson, Mats H. G. (2002). "Phylogeny of Clusiaceae Based on rbcL sequences". International Journal of Plant Sciences 163 (6): 1045. doi:10.1086/342521. JSTOR 3080291.
- ^ "Malpighiales". Angiosperm Phylogeny Website.
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