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|Family: Cyperaceae||View Description||Dichotomous Key|
|Genus: Bolboschoenus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Bolboschoenus glaucus (Lam.) S.G. Sm.
Habit: Plant <= 150 cm. Stem: 1.5--3 mm diam. Leaf: sheath tip with acutely triangular, membranous, veinless area; widest blade 2--6 mm wide. Inflorescence: proximal inflorescence bract 2--3 mm wide; spikelets 3--30, > 1/2 on branches, 10--40 mm, 3--5 mm wide; flower bracts 5--6 mm, awn 1--2 mm, base +- 0.25 mm wide. Flower: perianth bristles tightly (or some loosely) attached to, <= fruit; anthers yellow; stigmas (2)3. Fruit: 2.5--3.3 mm, 1.3--2.3 mm wide, weakly or strongly 3-sided, shallower than wide, sinking in water; mucro <= 0.1 mm; wall cells small, solid. Chromosomes: 2n=94.
Ecology: In dense stands locally. Fresh to brackish marshes, shores, wildlife refuges, rice-fields; Elevation: < 800 m. Bioregional Distribution: GV, CCo, SnFrB, SCo; Distribution Outside California: to Oregon, Idaho; New York; Eurasia, Africa. Flowering Time: Summer
Synonyms: Scirpus glaucus Lam.; Schoenoplectus glaucus (Lam.) Kartesz; Scirpus tuberosus Desf., misappl.
Unabridged Note: Until 1995 (S.G. Smith, Novon 5: 97--102; Browning et al., Brittonia 47: 433--445) Bolboschoenus glaucus (Lam.) S.G. Sm. was known in California as Scirpus tuberosus Desf. (misapplied). Until 1995 (S.G. Smith, Novon 5: 101; Browning et al. 1995) it was confused with Bolboschoenus (Scirpus) maritimus worldwide, doubtless because of hybridization. New record: SCo?, Hemet, ditch in farmland, Riverside Co., 1991, A.C. Sanders 13700, UCR, det. S.G. Smith 2005. Hybrid swarms with Bolboschoenus maritimus occur in wildlife refuges in GV. The common name "tuberous bulrush" was used for many years for Bolboschoenus glaucus, while the name Scirpus tuberosus was misapplied to this sp.; however, "tuberous bulrush" is inappropriate for this one sp. because, except for the rare and very local eastern Asian Bolboschoenus planiculmis, all species of Bolboschoenus world-wide have diagnostic "tubers" (actually corms formed as enlarged culm bases but persistent on the rhizomes for 1+ years as apparent tubers), so that the common name "tuberous bulrushes" is appropriate for the whole genus. Bolboschoenus glaucus × Bolboschoenus maritimus subsp. paludosus: +- fertile, forming hybrid swarms. GV, CCo; Idaho; Eurasia, Africa.
eFlora Treatment Author: S. Galen Smith
Jepson Online Interchange
Previous taxon: Bolboschoenus fluviatilis
Next taxon: Bolboschoenus maritimus subsp. paludosus
Citation for this treatment: S. Galen Smith 2017. Bolboschoenus glaucus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=80012, accessed on April 23, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on April 23, 2017.