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Landoltia punctata

Higher Taxonomy
Family: AraceaeView DescriptionDichotomous Key

Common Name: ARUM FAMILY
Habit: Perennial herb, [shrub, vine], terrestrial [growing on other plants or not], or aquatic, sometimes free-floating, then sometimes much reduced, in dense, clonal populations, 0.4--10 mm, flat and tongue-shaped to spheric, not differentiated into stems and leaves, new plants produced in budding pouch at base or along margins, sometimes overwintering on bottom as dense, rootless, starch-filled daughter plant (winter bud); often from short, generally erect caudex; roots 0--many; often monoecious. Stem: sometimes above ground in addition to caudex, or not differentiated from plant body. Leaf: simple or compound, basal (or cauline, 2-ranked), or not differentiated from plant body. Inflorescence: generally spike, fleshy, generally ill-smelling, or flower 1, rarely seen, minute, appearing like 2--3 unisexual flowers, often sheathed by minute membrane; flowers bisexual or pistillate below, staminate above; bract subtending spike 1, generally showy (petal-like), generally > spike, sheathing or not. Flower: perianth parts 0, 4, 6, free or fused; stamens 0--4, 6, free or fused; ovary superior to 1/2-inferior and sunken in inflorescence axis, chambers 1--3, stigma +- sessile. Fruit: berry or achene-like, winged or not. Seed: 1--many, often ribbed.
Genera In Family: +- 114 genera, 1850 species: generally tropics, subtropics some cultivated for food, ornamental in ponds, aquaria (Colocasia, taro) or ornamental (Philodendron, Anthurium). Note: Since TJM (1993), including Lemnaceae, and except Acorus, now in Acoraceae (the sole member in California, Acorus calamus L., is an historical waif). Pistia stratiotes L. is a waif. Pinellia ternata (Thunb.) Breitenbach possibly naturalized in California. In taxa once included in Lemnaceae, vein number per plant body best determined using backlight.
Unabridged Note: Since TJM (1993), including Lemnaceae, except Acorus, now in Acoraceae (the sole representative of the family in California, Acorus calamus, judged to be an historical waif in California and therefore here except). Incl smallest of all known angiosperms (Wolffia globosa) as well as world's most massive inflorescence (spike of Amorphophallus titanum, Titan Arum, to 4 m in circumference). Needle-like crystals in most tissues cause intense irritation when chewed; those of Dieffenbachia, dumb-cane, may induce temporary speechlessness. Incl of fossil evidence in cladistic analyses indicate Lemnaceae and Pistia form a monophyletic group within Araceae (Stockey et al.), a position now generally accepted (see Les et al.). Pinellia ternata (Thunb.) Makino ex Breitenbach introduced, possibly naturalized in California. Taxa formerly included in Lemnaceae may be very invasive. In taxa formerly included in Lemnaceae, vein number per plant body best determined using backlight. Peltandra virginica (L.) Schott & Endl., included in TJM (1993), reportedly spread from ornamental pool introduction in 1970 to nearby reserviors, but degree of reproduction or even persistence there unknown.
eFlora Treatment Author: Thomas J. Rosatti, except as noted
Scientific Editor: Bruce G. Baldwin, Thomas J. Rosatti.
Genus: LandoltiaView Description 

Common Name: DOTTED DUCKMEAT

Species In Genus: 1 sp. Etymology: (Elias Landolt, Swiss expert on Lemnaceae, b. 1926)
eFlora Treatment Author: Wayne P. Armstrong

Landoltia punctata (G. Mey.) Les & D.J. Crawford
NATIVE
Habit: Plants much reduced, not differentiated into stems, leaves; floating aquatics; roots generally 2--7, all passing through minute scale on lower surface. Plant Body: generally in 2s to 5s; 3--5 mm, oblong to obovate, asymmetric, flat; veins 3--7; upper surface dark green, shiny, midline often with row of minute bumps, lower surface generally red-purple; young plants with minute scale-like leaf on each side at base; winter buds 0. Inflorescence: flowers in 2 lateral budding pouches, sheathed by minute membrane. Seed: ribbed.
Ecology: Still water in valleys; Elevation: < 2050 m. Bioregional Distribution: NCo, CaRH, GV, CCo, SnFrB, SCo; Distribution Outside California: +- worldwide. Flowering Time: Summer--early fall
Synonyms: Spirodela punctata (G. Mey.) C.H. Thomps.; Spirodela oligorrhiza (Kurz) Hegelm.
eFlora Treatment Author: Wayne P. Armstrong
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Citation for this treatment: Wayne P. Armstrong 2016. Landoltia punctata, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=81823, accessed on May 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 05, 2016.


Landoltia punctata
click for enlargement
© 2010 George W. Hartwell
Landoltia punctata
click for enlargement
© 2010 George W. Hartwell
Landoltia punctata
click for enlargement
© 2010 George W. Hartwell

More photos of Landoltia punctata in CalPhotos


Geographic subdivisions for Landoltia punctata:
NCo, CaRH, GV, CCo, SnFrB, SCo;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.