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Poaceae Tribe Arundineae
Perennials or rarely annuals, sometimes tall weeds or tussock grasses. Leaf-blades narrowly linear or setaceous, occasionally flat; ligule a short scarious membrane or a line of hairs. Inflorescence an open or contracted panicle, sometimes large and plumose. Spikelets bisexual or the uppermost reduced, rarely unisexual and dioecious, laterally compressed, 2-10-flowered; rhachilla disarticulating beneath each floret, often produced and crowned with a rudimentary floret, sometimes long-villous; glumes persistent, hyaline to scarious or subherbaceous; lemmas membranous to coriaceous, 1-many-nerved, ± hairy or occasionally long-villous, entire or 2-lobed, awnless or awned from the tip or sinus, the lobes also often aristate; awn geniculate with a twisted column, sometimes straight; palea hyaline, shorter than or nearly as long as the lemma; lodicules 2-3; stamens 2-3, often minute; stigmas 2. Grain with medium-sized embryo and linear hilum; starch grains com¬pound. Chromosomes small, basic number 6, 9 or 12.
Genera ± 35; cosmopolitan; 6 genera and 10 species in Pakistan.
Arundineae were originally conceived as a tribe of tall grasses with large plumose panicles. However, it is by no means a homogeneous tribe and, with the shift in emphasis from spikelet morphology to cryptic characters as tribal criteria, its distinction from Danthonieae is no longer tenable.
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1 |
Tall reed-like grasses with large plumose panicles |
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(2) |
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Slender grasses without large plumose panicles |
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(4) |
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2 (1) |
Ligule membranous |
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Arundo |
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Ligule a line of hairs |
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(3) |
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3 (2) |
Lowest panicle branches with a silky beard at the base |
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Phragmites |
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Lowest panicle branches without a silky beard at the base………..........................................................................see |
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Neyraudia |
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4 (1) |
Lemmas notched or shallowly 2-lobed, awnless or with a minute awn in the sinus |
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Schismus |
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Lemmas deeply 2-lobed; awn perfect |
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(5) |
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5 (4) |
Ligule a line of hairs |
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(6) |
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Ligule a conspicuous membrane |
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Duthiea |
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6 (5) |
Glumes prominently 7-11-nerved, chartaceous, scabrid; lemmas densely short-hairy between the nerves |
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Asthenatherum |
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Glumes not prominently nerved, rather thin; lemmas not short-hairy between the nerves |
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Danthonia |
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Lower Taxa
Related Synonym(s):
Related Links (opens in a new window) |
Treatments in Other Floras @ www.efloras.org
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