The Poales are a large order of in the , and includes families of plants such as the Poaceae, bromeliads, Juncaceae and Cyperaceae. Sixteen plant families are currently recognized by botanists to be part of Poales.
Description
The
are typically small, enclosed by bracts, and arranged in
(except in three species of the genus
Mayaca, which possess very reduced, one-flowered inflorescences). The flowers of many species are wind pollinated; the seeds usually contain
starch.
Taxonomy
The APG III system (2009) accepts the order within a
monocot clade called
commelinids, and accepts the following 16 families:
[
]
The earlier APG system (1998) adopted the same placement of the order, although it used the spelling "commelinoids". It did not include the Bromeliaceae and Mayaceae, but had the additional families Prioniaceae (now included in Thurniaceae), Sparganiaceae (now in Typhaceae), and Hydatellaceae (now transferred out of the monocots; recently discovered to be an 'early-diverging' lineage of flowering plants).
The morphology-based Cronquist system did not include an order named Poales, assigning these families to the orders Bromeliales, Cyperales, Hydatellales, Juncales, Restionales and Typhales.
In early systems, an order including the grass family did not go by the name Poales but by a descriptive botanical name such as Graminales in the Engler system (update of 1964) and in the Hutchinson system (first edition, first volume, 1926), Glumiflorae in the Wettstein system (last revised 1935) or Glumaceae in the Bentham & Hooker system (third volume, 1883).
Evolution and phylogeny
The earliest fossils attributed to the Poales date to the late Cretaceous period about million years ago, though some studies (e.g., Bremer, 2002) suggest the origin of the group may extend to nearly 115 million years ago, likely in South America. The earliest known fossils include pollen and fruits.
The phylogenetic position of Poales within the commelinids was difficult to resolve, but an analysis using complete chloroplast DNA found support for Poales as sister group of Commelinales plus Zingiberales.[ ] The relationship between Centrolepidaceae and Restoniaceae within the restiid clade remains unclear; the first may actually be embedded in the latter.
Diversity
The four most species-rich families in the order are:
-
Poaceae: 12,070 species
-
Cyperaceae: 5,500 species
-
Bromeliaceae: 3,170 species
-
Eriocaulaceae: 1,150 species
File:Typha_latifolia_Finland.jpg|alt=Typha inflorescence| Typha latifolia, Typhaceae
File:Carex demissa detail.jpeg|alt=Carex demissa inflorescence| Carex demissa, Cyperaceae
File:N Xyrc D9741.JPG|alt=Xyris deplanata flower| Xyris complanata, Xyridaceae
File:Elegia capensis CHCH 2.JPG|alt=Elegia capensis stand| Elegia capensis, Restionaceae
File:Japanese_Foxtail_millet_02.jpg|alt=Unripe millet panicles|Foxtail millet, Poaceae
Historic taxonomy
Cyperales
Cyperales was a name for an order of . As used in the Engler system (update, of 1964) and in the Wettstein system it consisted of only the single family. In the Cronquist system it is used for an order (placed in subclass Commelinidae) and circumscribed as (1981):[D.J. Mabberley. 2000. The Plant-Book, 2nd ed. Cambridge University Press, Cambridge, UK, 858 p. H.]
The APG system now assigns the plants involved to the order Poales.
Eriocaulales
Eriocaulales is a botanical name for an order of . The name was published by Takenoshin Nakai. In the Cronquist system the name was used for an order placed in the subclass Commelinidae. The order consisted of one family only (1981):
The APG IV system now assigns these plants to the order Poales.
Uses
The Poales are the most economically important order of monocots and possibly the most important order of plants in general. Within the order, by far the most important family economically is the family of grasses (Poaceae, syn. Gramineae), which includes the starch staples barley, maize, millet, rice, and wheat as well as bamboos (mostly used structurally, like wood, but somewhat as vegetables), and a few "seasonings" like sugarcane and lemongrass. Graminoids, especially the grasses, are typically dominant in open (low moisture but not yet arid, or also fire climax) habitats like prairie/steppe and savannah and thus form a large proportion of the forage of grazing livestock. Possibly due to pastoral nostalgia or simply a desire for open areas for play, they dominate most Western yards as lawns, which consume vast sums of money in upkeep (artificial grazing—mowing—for aesthetics and to keep the allergenic flowers suppressed, irrigation, and fertilizer). Many Bromeliaceae are used as ornamental plants (and one, the pineapple, is internationally grown in the tropics for fruit). Many wetland species of sedges, rushes, grasses, and cattails are important habitat plants for waterfowl, are used in weaving chair seats, and (especially cattails) were important pre-agricultural food sources for man. Two sedges, chufa ( Cyperus esculentus, also a significant weed) and water chestnut ( Eleocharis dulcis) are still at least locally important wetland starchy root crops.
Bibliography
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Judd, W. S., C. S. Campbell, E. A. Kellogg, P. F. Stevens, M. J. Donoghue (2002). Plant Systematics: A Phylogenetic Approach, 2nd edition. pp. 276–292 (Poales). Sinauer Associates, Sunderland, Massachusetts. .
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Small, J. K. (1903). Flora of the Southeastern United States, 48. New York, United States
External links
