Rhynchospora alba
 
White Beak-Rush

Base of Leaf, Abaxial Side

Greenbush Bog, 20 km West of Hudson Bay, SK on Highway #3
29-July-2016

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Alba: Answers to key questions in Budd's Flora leading to this species. 
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uppermost bract about as long as the glomerules; NOT  [uppermost bract much longer than the glomerules]

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glomerules turbinate; NOT [glomerules ovoid or oblong]

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bristles 10-12; NOT [bristles 6]

 

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Rhynchospora: Answers to key questions in Budd's Flora  and Flora of Alberta leading to this genus. 
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culms with bristle-like leaves; NOT [culms leafless, with sheaths usually bladeless]

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spikelets several, terminal and lateral; NOT [spikelet solitary, terminal], NOT [spikelets in simple or compound terminal umbels]

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scales of the spikelets several-ranked, spirally imbricate; NOT [scales of the spikelets 2-ranked]

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scales of the spikelets not keeled

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flowers all perfect, or at least one in each spikelet perfect; NOT [flowers imperfect, plants monoecious or dioecious]

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perianth usually present as bristles; NOT [perianth lacking]

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achenes not enclosed in a perigynium or bract; NOT [achenes enclosed in a perigynium or bract]

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base of the style persistent as a tubercle on top of the achene; NOT [base of the style not persistent, the achene without a tubercle]

 

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Cyperaceae: Answers to key questions in Budd's Flora  leading to this family. 
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plants not aquatic, or if growing in water, most of the plant emersed; NOT [plants aquatic, floating or submerged, with floating leaves or emersed inflorescence]

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culms usually solid; NOT culms usually hollow]

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leaves three-ranked; NOT [leaves two-ranked]

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inflorescence NOT [a dense, single, cylindrical spike 8-15 cm long, 1-2.5 cm thick], if a single spike, less than 1 cm thick

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flowers not in globular heads; NOT [flowers in globular heads, the upper ones staminate, the lower ones pistillate]

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flowers solitary in the axil of a single bract (scale); NOT [flowers enclosed in two-ranked bracts with the lowest (glumes) empty]

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perianth reduced to bristles, or scales, or lacking; NOT [perianth reduced to minute lodicules], NOT [perianth present, conspicuous, in two series of 3 segments, often brightly colored]