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Vascular Plants of California
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Utricularia minor
LESSER BLADDERWORT


Higher Taxonomy
Family: LentibulariaceaeView DescriptionDichotomous Key
Common Name: BLADDERWORT FAMILY
Habit: Annual, perennial herb, carnivorous, of moist or aquatic habitats. Stem: caudex or stolon, then often with thread-like branches. Leaf: simple, in rosette, or simple or dissected, emerging from caudex or stolon, with minute, carnivorous bladders +- throughout. Inflorescence: raceme or 1-flowered, scapose. Flower: bisexual; calyx lips 2[4], upper 3-lobed, lower 2-lobed, or lips unlobed; corolla 2-lipped, spurred at base, lower lip flat or arched upward, blocking throat or not; stamens 2, epipetalous; ovary superior, chamber 1, placenta generally free-central; stigma unequally 2-lobed, +- sessile. Fruit: capsule, round, 2-valved, circumscissile, or irregularly dehiscent. Seed: generally many, small.
Genera In Family: 3 genera, 330 species: worldwide, especially tropics.
eFlora Treatment Author: Barry A. Rice
Scientific Editor: Thomas J. Rosatti.
Genus: UtriculariaView DescriptionDichotomous Key


Common Name: BLADDERWORT
Habit: Carnivorous by bladders (here treated as modified leaves), into which small organisms are sucked when hairs at opening are triggered [epiphytic]. Stem: submersed or subterranean shoots [rarely caudex]; some aquatic species produce 2 kinds of stems, green (in water or at surface; leaves with flattened or thread-like segments; bladders 0--few) and white (generally buried in substrate; leaves 0; bladders many), the latter not always present in poor collections. Leaf: simple or generally dissected into narrow segments, alternate on stolon, margins often with bristles (visible at 10--30×). Inflorescence: raceme or 1-flowered, emergent; scape slender or wiry, bracts present. Flower: calyx lips 2[4], unlobed; corolla yellow [or not], with red-brown streaks or not, upper lip +- entire, lower entire or 3-lobed, spurred; rarely cleistogamous. Fruit: capsule.
Species In Genus: +- 220 species: worldwide, especially tropics, Australia. Etymology: (Latin: little bag, from bladders) Note: Size variable, often unreliable for identification; distinction between stems, leaves uncertain. Glands inside bladders consist of 2 pairs of oppositely directed arms, angles of divergence between which used (at 150× or more) to identify fresh or pressed specimens.
Reference: Taylor 1989 Kew Bull Add Ser 14:1--724
Utricularia minor L.
NATIVE
Habit: Rooted or floating aquatic. Stem: slender, weakly to strongly of 2 kinds, some with many leaves, some bladders, others with 0--few leaves, +- many bladders; winter buds glabrous. Leaf: 2--15 mm, 3-parted at base, variously dissected above; ultimate segments 7--22, +- thread-like to flattened, margin bristles 0 or microscopic. Inflorescence: 2--6-flowered; peduncle 3--25 cm, wiry, 0.4--0.8 mm diam; pedicel recurved in fruit. Flower: corolla 6--8 mm; lower lip > 2 × upper, 2 × sac-like spur. Fruit: circumscissile. Seed: 4--6-sided, +- unwinged. Chromosomes: 2n=+-40.
Ecology: Shallow (generally < 30 cm) acidic waters; Elevation: 800--2900 m. Bioregional Distribution: CaRH, SNH, MP; Distribution Outside California: Alaska, northern United States, Canada; circumboreal. Flowering Time: Jun--Sep
Jepson eFlora Author: Barry A. Rice
Reference: Taylor 1989 Kew Bull Add Ser 14:1--724
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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Next taxon: Utricularia ochroleuca

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Botanical illustration including Utricularia minor

botanical illustration including Utricularia minor

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Citation for this treatment: Barry A. Rice 2012, Utricularia minor, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=47609, accessed on October 21, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on October 21, 2019.

Utricularia minor
click for enlargement
© 2012 Barry Rice
Utricularia minor
click for enlargement
© 2009 Barry Rice
Utricularia minor
click for enlargement
© 2012 Barry Rice
Utricularia minor
click for enlargement
© 2012 Barry Rice
Utricularia minor
click for enlargement
© 2009 Barry Rice
Utricularia minor
click for enlargement
© 2012 Barry Rice

More photos of Utricularia minor in CalPhotos



Geographic subdivisions for Utricularia minor:
CaRH, SNH, MP
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.