Scirpus microcarpus
 
Small-Fruited Bulrush

Base of Highest Leaf, Side A

Centre Block, Cypress Hills Interprovincial Park
08-July-2014

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Microcarpus: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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rhizomes lacking swollen nodes; NOT [rhizomes with swollen nodes]

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plants stoloniferous; NOT [plants caespitose]

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cauline leaves usually well developed; NOT [cauline leaves usually much reduced]

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sheaths usually reddish or reddish purple; NOT [sheaths green, drying brown]

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inflorescence appearing terminal; NOT [inflorescence appearing lateral]

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involucre of several green leaf-like bracts, spreading; NOT [involucre a single erect bract, appearing as a continuation of the stem], NOT [involucre consisting of 1 scale-like bract]

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spikelets in a much branched inflorescence (BF)

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spikelets in compound umbels or dense umbellate heads; NOT [spikelets in head-like or umbellate clusters] (FOA)

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spikelets very numerous; NOT [spikelets 2-12] (FOA)

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spikelets long-peduncled; NOT [spikelets short-peduncled or subsessile] (BF)

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spikelets 3-10 mm long; NOT [spikelets 10-50 mm long] (BF)

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spikelets less than 8 mm long; NOT [spikelets more than 10 mm long] (FOA)

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bristles as long as or shorter than the scales; NOT [bristles much longer than the scales, protruding and persistent]

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stigmas 2; NOT [stigmas 3]

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achene lenticular; NOT [achene triangular]

 

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Scirpus: Answers to key questions in Budd's Flora  and Flora of Alberta leading to this genus. 
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flowers perfect, with spikelets uniform; NOT [flowers imperfect, with staminate and pistillate flowers in same or different spikelets]

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

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spikelets solitary and terminal or partly lateral; NOT [spikelets in simple or compound terminal umbels] (BF)

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NOT [spikelets in terminal heads or spikes] (FOA)

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scales of the spikelets NOT keeled

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perianth usually present as bristles; NOT [perianth lacking]

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perianth bristles 1-6, rarely lacking; NOT [bristles numerous]

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perianth bristles usually a little longer or shorter than the achene, elongating only in S. hudsonianus; NOT [perianth bristles often 2-3 cm long, silky]

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achenes not enclosed in a perigynium or bract

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

 

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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 inconspicuous, not in two whorls; NOT [perianth present, conspicuous, in two series of 3 segments, often brightly colored]

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perianth reduced to bristles; NOT [perianth reduced to minute lodicules or lacking]