Jepson eFlora: Taxon page
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Ottelia alismoides

Higher Taxonomy
Family: HydrocharitaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, aquatic, freshwater or marine, glabrous or hairy; monoecious, dioecious, or flowers bisexual. Leaf: basal, alternate, opposite, or whorled, generally sessile, generally +- sheathing at base. Inflorescence: axillary, terminal, or scapose, cyme or flowers 1, subtended by +- sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating. Flower: generally radial; perianth 0 or tube 0 or elongate, peduncle-like in flower; sepals (0)3(4), green; petals (0)3(4), white or not; stamens (0)2--many, generally in 1+ series; ovary inferior, chamber 1 or falsely 6--9, placentas parietal, ovules 1--many, style lobes generally 3, linear, lobed or notched. Fruit: achene or berry-like and dehiscing irregularly, linear to spheric, submersed.
Genera In Family: +- 17 genera, +- 130 species: worldwide; some cultivated for aquaria, others noxious weeds. Note: Ottelia alismoides (L.) Pers. is a possibly extirpated alien.
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
Scientific Editor: Thomas J. Rosatti.
Genus: OtteliaView Description 

Habit: Annual, perennial herb, submersed to emergent, rooted in mud. Stem: generally short, erect. Leaf: basal, petioled, alternate. Inflorescence: terminal; flowers 1, emergent; bract +- enclosing flower, ribbed or winged, persistent in fruit. Flower: bisexual, emergent, fragrant; sepals 3; petals 3; stamens 3, staminodes >= 6; ovary oblong, stigmas 6--9, linear, deeply 2-lobed to me. Fruit: 15--40 mm, oblong, irregularly dehiscent, generally ribbed. Seed: several.
Species In Genus: +- 21 species: tropics, warm temperate Eurasia. Etymology: (Malay: to stick to, from leaves)

Ottelia alismoides (L.) Pers.
Leaf: 10--25 cm, entire or crisped, veins parallel, curved; lower, submersed blades elliptic to ovate, upper, floating or emergent blades ovate to cordate or reniform. Flower: sepals +- 1.5 cm, 4 mm wide; petals 2--3 cm, obovate, white to +- pink; anthers bright yellow. Fruit: < 4 cm, oblong; tip beaked.
Ecology: Ditches, rice-fields; Elevation: +- 50 m. Bioregional Distribution: e ScV (Butte Co.); Distribution Outside California: Louisiana; native to Africa, India, southwestern Pacific, tropical Asia, Australia. Flowering Time: Summer--fall Note: Potentially noxious weed; reportedly extirpated in California.
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
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Citation for this treatment: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes 2016. Ottelia alismoides, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 01, 2016.

Geographic subdivisions for Ottelia alismoides:
e ScV (Butte Co.);
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.
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.