Key to Bolboschoenus
View taxon page for Bolboschoenus
(For a list of species in Bolboschoenus, use the above link.)
Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.
1' Stigmas generally 3; fruit generally 3-sided, tightly attached bristles 0–6
2. Flower
bract 
Reduced, leaf- or scale-like structure subtending a branch, cone scale, peduncle, pedicel, or flower.
awn 
1. Bristle-like appendage or elongation, generally terminal. 2. Stiff, needle-like pappus element in Asteraceae.
base ± 0.5 mm wide;
anthers orange; fruit floating on water, tightly attached bristles 0
..... B. robustus 2' Flower bract awn base 0.2–0.3 mm wide; anthers yellow; fruit sinking in water, tightly attached bristles 3–6
3. Widest
leaf 
Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets).
blade 
Expanded portion of a leaf, petal, or other structure, generally flat but sometimes rolled, cylindric, wavy, or cupped.
>= 7 mm wide;
spikelet 
1. In Poaceae, one or more florets (each a flower with subtending lemma and generally palea) and generally 2 subtending glumes; in a sterile spikelet, the flower(s) and sometimes palea(s) are rudimentary or absent. 2. In Cyperaceae, the smallest aggregation of flowers (generally more than 2) and associated bracts.
6–10 mm wide; leaf
sheath 
A surrounding or partially surrounding, often tubular structure or part of a structure, such as a leaf base in Apiaceae or Poaceae.
tip papery, veined; fruit 3.8–5.5 mm, as deep as wide,
mucro 0.2–0.8 mm
..... B. fluviatilis 3' Widest leaf blade < 7 mm wide; spikelet 3–5 mm wide; leaf sheath tip with triangular,
membranous, veinless area; fruit 2.5–3.3 mm, shallower than wide, mucro <= 0.1 mm
..... B. glaucus
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