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Rotala ramosior

Higher Taxonomy
Family: LythraceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, shrub, tree. Stem: 4-angled or cylindric. Leaf: simple, entire, generally opposite, 4-ranked (alternate, whorled). Inflorescence: flowers terminal or in axils of upper leaves or leaf-like bracts, 1 or in +- dense cymes or along short shoots, sessile or not, subtended by [0]2 bractlets. Flower: bisexual, generally radial; hypanthium bell-shaped to cylindric, membranous or leathery, persistent in fruit; sepals appearing as hypanthium lobes, 4--9, epicalyx lobes alternate sepals or 0; petals, stamens inserted on inner hypanthium; petals 4--6 or 0, alternate sepals, crinkled, deciduous; stamens generally = or 2 × sepals, included or exserted; ovary generally superior, chambers 2--6[many], style generally slender, stigma head-like. Fruit: dry capsule or leathery berry, dehiscent into 2--4 valves or irregularly. Seed: 3--many.
Genera In Family: +- 28 genera, 600 species: temperate, tropics, generally in wet habitats. Some ornamental or cultivated for medicine, dyes. Note: "Epicalyx lobes" (lobes on calyx) formerly called "appendages," "hypanthium" in Lythraceae (and Onagraceae) including receptacle, sometimes called "flower cup" or "flower tube". Punicaceae (Punica) included here.
eFlora Treatment Author: Shirley A. Graham
Scientific Editor: Thomas J. Rosatti.
Genus: RotalaView DescriptionDichotomous Key

Habit: Annual, perennial herb, glabrous. Stem: spreading to erect, generally branched, 4-angled to rounded. Leaf: opposite, 4-ranked (whorled), generally sessile. Inflorescence: flowers 1 per axil on main shoots and on short axillary shoots, sessile. Flower: radial; hypanthium bell- to +- urn-shaped; sepals generally 4, epicalyx lobes 4 or 0; petals 4, minute, < sepals; stamens generally 4, +- included (exserted). Fruit: capsule, oblong to +- spheric, golden, wall finely transversely striate at 10× thin, dry, valves 2--4. Seed: many, < 1 mm.
Species In Genus: +- 48 species: temperate, tropics. Etymology: (Latin: wheel-like)

Rotala ramosior (L.) Koehne
Stem: 1--5 dm. Inflorescence: flowers 1 per axil, bractlets lanceolate, < (to >) hypanthium. Flower: hypanthium 2--5 mm; sepals broadly deltate; petals white to pink; stamens generally 4, +- included. Fruit: ovoid to +- spheric. Chromosomes: 2n=16,32.
Ecology: Lake and pond margins, streams; Elevation: < 1900 m. Bioregional Distribution: s NCoRO, NCoRI, CaR, n&c SN, GV; Distribution Outside California: to Washington, eastern United States, South America. Flowering Time: Jun--Aug
Synonyms: Rotala catholica (Cham. & Schltdl.) Leeuwen; Rotala dentifera (A. Gray) Koehne
eFlora Treatment Author: Shirley A. Graham
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botanical illustration including Rotala ramosior


Citation for this treatment: Shirley A. Graham 2016. Rotala ramosior, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 30, 2016.

Rotala ramosior
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© 2014 Barry Breckling

More photos of Rotala ramosior in CalPhotos

Geographic subdivisions for Rotala ramosior:
s NCoRO, NCoRI, CaR, n&c SN, GV;
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.