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Lavatera trimestris
ANNUAL LAVATERA, ROSE MALLOW

Higher Taxonomy
Family: MalvaceaeView DescriptionDichotomous Key

Common Name: MALLOW FAMILY
Habit: Annual to tree; generally with stellate hairs, often with bristles or peltate scales; juice generally mucilage-like; bark fibrous. Leaf: generally cauline, alternate, petioled, simple [palmate-compound], generally palmate-lobed and/or veined, generally toothed, evergreen or not; stipules persistent or not. Inflorescence: head, spike, raceme, or panicle, in panicle or not (a compound panicle), or flowers >= 1 in leaf axils, or flowers generally 1 opposite a leaf or on a spur; bracts leaf-like or not; bractlets 0 or on flowering stalks, often closely subtending calyx, generally in involucel. Flower: generally bisexual, radial; sepals 5, generally fused at base, abutting in bud, larger in fruit or not, nectaries as tufts of glandular hairs at base; petals (0)5, free from each other but generally fused at base to, falling with filament tube, clawed or not; stamens 5--many, filaments fused for most of length into tube around style, staminodes 5, alternate stamens, or generally 0; pistil 1, ovary superior, stalked or generally not, chambers generally >= 5, styles or style branches, stigmas generally 1 or 1--2 × chamber number. Fruit: loculicidal capsule, [berry], or 5--many, disk- or wedge-shaped segments (= mericarps).
Genera In Family: 266 genera, 4025 species: worldwide, especially warm regions; some cultivated (e.g., Abelmoschus okra; Alcea hollyhock; Gossypium cotton; Hibiscus hibiscus). Note: Recently treated to include Bombacaceae, Sterculiaceae, Tiliaceae. Mature fruit needed for identification; "outer edges" are surfaces between sides and back (abaxial surface) of segment. "Flower stalk" used instead of "pedicel," "peduncle," especially where both needed (i.e., when flowers both 1 in leaf axils and otherwise).
eFlora Treatment Author: Steven R. Hill, except as noted
Scientific Editor: Steven R. Hill, Thomas J. Rosatti.
Genus: LavateraView DescriptionDichotomous Key

Habit: Annual, biennial, perennial herb, shrub, +- glabrous to stellate-hairy. Stem: erect, herbaceous to soft-woody. Leaf: petioled; blade ovate to lanceolate, shallowly to deeply 5--7(9)-lobed or lobes 0, generally crenate to dentate. Inflorescence: raceme-like or generally flowers 1[several] in leaf axils; bractlets 3, fused generally 1/2. Flower: generally showy; petals pink, purple, rose-purple or white, dark-veined or not; anthers near top of filament tube, below, generally not clustered; stigmas linear, on inner side of style branches. Fruit: +- disk-like; segments (6)10--19, indehiscent, smooth or variously ribbed and/or hairy, outer edges generally rounded, beak 0. Seed: 1 per segment, generally not firmly enclosed by, readily separating from fruit wall, reniform, glabrous.
Species In Genus: +- 12 species: Europe, especially Mediterranean, Asia, Africa. Etymology: (Lavater brothers, 17th century Swiss physicians, naturalists) Note: Most species transferred to Malva, primarily on molecular data (Ray 1995, 1998); other commonly cultivated species that may escape including Lavatera cashmiriana Camb., Lavatera thuringiaca L.

Lavatera trimestris L.
WAIF
Stem: erect, generally 0.5--1 m, generally bristly. Leaf: petiole to 9--13 cm; stipules 2--5 mm, generally deciduous; lower blades 3--12 cm, 2.5--5 cm wide, rounded to cordate, crenate, upper generally smaller, shallowly palmate-3--7-lobed, lobes acute to obtuse. Inflorescence: flowers 1 in leaf axils, generally +- clustered toward stem tips; flowering stalks 2.5(7) cm; bractlets 1 cm, +- 1 cm wide, ovate, lobes 6, 3 smaller alternate 3 larger. Flower: calyx +- 15 mm, sparsely hairy; petals 2--5 cm; anthers on upper 2/3 of filament tube. Fruit: segments +- 12, ridged, covered by disk-like expansion from central axis. Chromosomes: 2n=14.
Ecology: Water edge, disturbed places; Elevation: < 300 m. Bioregional Distribution: w SCo (Lauro Canyon, Santa Barbara Co.), WTR; Distribution Outside California: native to Mediterranean, widely cultivated. Flowering Time: May--Jun Note: Rarely escapes cultivation.
eFlora Treatment Author: Steven R. Hill
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Citation for this treatment: Steven R. Hill 2016. Lavatera trimestris, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=30378, accessed on February 08, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 08, 2016.


Geographic subdivisions for Lavatera trimestris:
w SCo (Lauro Canyon, Santa Barbara Co.), WTR;
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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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Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.