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Key to Juncus, KEY B: Subkey in Juncus
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https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39606
3 Heads >9 per culm; [collectively widespread]. | |
4 Infructescence usually congested, (1.8-) 2.4-4.7 (-6.4) cm long; greatest distance between adjacent rhizome cataphylls (5.3-) 6.3-10.5 (-13.0) mm; rhizome width (measured between adjacent cataphylls) (0.8-) 1.0-1.4 (-1.9) mm | |
4 Infructescence usually loose, (1.4-) 17.9-103.9 (-145) cm long; greatest distance between adjacent rhizome cataphylls (0.1-) 0.4-3.0 (-4.6) mm; rhizome width (measured between adjacent cataphylls) (0.4-) 1.0-3.5 (-4.5) mm. | |
1 Flowers borne singly on branches of inflorescence, individual flowers subtended by two bracteoles (in addition to the bracteole at the base of the pedicel). | |
6 Plants annual, without coarse roots or persistent leaf bases; [subgenus Agathryon, section Tenageia] | |
6 Plants perennial, with coarse roots or persistent leaf bases. | |
9 Capsules < 3/4 length of perianth; unbranched terminal sections of the inflorescence with 2-5 flowers, the longest distance between the adjacent flowers (excluding the peduncle) 6-11 mm | |
9 Capsules > 3/4 length of perianth; unbranched terminal sections of the inflorescence with 1-3 (-4) flowers, the longest distance between the adjacent flowers (excluding the peduncle) 0.5-5.5 mm | |
10 Cauline leaves absent. | |
16 Anthers 1.2-1.5 mm long; auricles scarious to membranous, 0.2-0.3 mm long; [of granitic flatrocks in the Piedmont from NC, SC, GA, and AL] | |
17 Auricles whitish or straw colored, dull; perianth not spreading. | |