|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|Family: Cyperaceae||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Perennial herb, erect, 50--200 cm, rhizomed, tubers durable. Stem: simple, sharply 3-angled, glabrous or angles scabrous, evident internal air cavities 0, not hollow. Leaf: basal and cauline, 3-ranked; sheath closed, long; ligule 0; blade generally present, long, thin, flat, V-shaped near base, keeled abaxially, margin, keel +- scabrous. Inflorescence: 1, terminal, panicle- (or head-) like, appearing with leaves; branches often scabrous; inflorescence bracts like leaf blades, main 1 > inflorescence; spikelets +- ovate, not +- flat, flower bracts spiraled, >= 25, each with 1 flower in axil, +- ovate, membranous to papery, puberulent (glabrous in age), brown to +- colorless, tip notched 0.5--1 mm, generally with curved awn often broken off. Flower: bisexual; perianth of 3--6 bristles, <= fruit, +- straight, stout, barbed; stamens 3, anthers >= 1.5 mm; style 1, thread-like, base not enlarged; stigmas 2--3. Fruit: generally obovate, smooth, brown, mucronate; wall cells small, solid or large, hollow (under dissecting microscope).
Ecology: Wetlands, often emergent. Species In Genus: 7--15 species: temperate, subtropics. Etymology: (Greek, bolbos, a bulb, and schoenos a rush, reed, in reference to the tubers) Note: Intermediates (putative hybrids) between species cause major problems in classification, identification.
Unabridged Note: Fruit wall anatomy (+- easily seen with a dissecting microscope in a hand-made section) including diagnostic characters that are correlated with fruit buoyancy and persistence of bristles on shed fruit. Putative interspecific hybridization causes major taxonomic confusion; putative hybrids generally occur with their parents, are intermediate between them in all characters, often bear apparently normal fruit that vary in shape within one spikelet, and form persistent clones.
eFlora Treatment Author: S. Galen Smith
Jepson Online Interchange
Key to BolboschoenusPrevious taxon: Amphiscirpus nevadensis
Next taxon: Bolboschoenus fluviatilis
Citation for this treatment: S. Galen Smith 2016. Bolboschoenus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=68138, accessed on May 27, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 27, 2016.