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Wooly rosemallow on Bacon Island, California. © 2007 Christopher Bronny. |
Subspecies:
wooly rosemallow
common rosemallow
eastern rose-mallow
TAXONOMY:
The scientific name of crimsoneyed rosemallow is Hibiscus moscheutos L. (Malvaceae) [7,11,14,20,28,30,35,39,40].
There are 2 recognized subspecies :
Hibiscus moscheutos L. subsp. lasiocarpos (Cav.) O.J. Blanchard [9,19,20], wooly rosemallow
Hibiscus moscheutos L. subsp. moscheutos [9,20,30,39], common rosemallow
In this review, "crimsoneyed rosemallow" refers to the species. Subspecies are referred to by the common names listed above.
SYNONYMS:
Subspecies— for Hibiscus moscheutos L. subsp. lasiocarpos: Hibiscus californicus Kellogg [6,27] Hibiscus lasiocarpos Cav. [11,15,18,28] Hibiscus moscheutos var. occidentalis Torr. [14] for Hibiscus moscheutos L. subsp. moscheutos: Forb FEDERAL LEGAL STATUS: No special status |
![]() Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA SCS. 1991. Southern wetland flora: Field office guide to plant species. South National Technical Center, Fort Worth. |
INFORMATION AVAILABLE:
In February of 2008 an extensive search was done to locate information on crimsoneyed rosemallow with little success
(see FEIS's list of source literature).
The following paragraphs provide details of the available information.
Wooly rosemallow occurs from Illinois and Indiana south to New Mexico and Florida, with disjunct populations in California [20]. It is reported from one locality in Chihuahua, Mexico [4].
Common rosemallow occurs from Ontario south to Louisiana and Florida and from Kansas south to Texas, with disjunct populations in Utah [20].
HABITAT TYPES AND PLANT COMMUNITIES:
GENERAL BOTANICAL CHARACTERISTICS: This description provides characteristics that may be relevant to fire ecology, and is not meant for identification. Keys for identification are available (for example, [7,9,14,28,30,35,39,40]). Crimsoneyed rosemallow is a shrubby, herbaceous perennial forb. It produces few to many stems (3-8 feet (1-2.5 m) tall) each year from a large, woody rootstock. Leaves are ovate to lanceolate, serrate, and 3 to 8.7 inches (8-22 cm) long. The leaves can be unlobed or with 2 lateral lobes. Flowers are borne on upper leaf axils and are ephemeral. Large plants can produce up to 20 to 30 open flowers daily at the peak of the blooming season. The fruit is a capsule [9,15,26,30,35] bearing hard-coated seeds less than 3 mm in diameter [5]. Crimsoneyed rosemallow has a short underground caudex with large storage roots attached [2,14] (see photo at right). Common rosemallow is glabrous on the upper leaf surface and has glabrous capsules, while wooly rosemallow is pubescent on both leaf surfaces and has hirsute capsules [15]. Wooly rosemallow is rhizomatous in California [6]. RAUNKIAER [31] LIFE FORM:Helophyte Geophyte |
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Photo courtesy of Dr. Michael Knee, Ohio State University. |
Pollination: Crimsoneyed rosemallow is self-compatible and is pollinated by bees [4,8,26,32]. Bumblebees and solitary anthophorid bees (Ptilithrix bombiformis) are the most effective pollinators [4,32,34]. Studies in Maryland found Ptilithrix bombiformis pollinated the majority of common rosemallow flowers [4,34].
Breeding System: Crimsoneyed rosemallow has perfect flowers [8]. It produces a mixture of selfed and outcrossed seeds [26]. Within-flower selfing is unlikely due to spatial separation of anthers and stigmas, but between-flower selfing can occur. The potential for the latter is limited because only 1 or 2 flowers open on each shoot or branch tip on a given day [32,33,34]. Long-distance water dispersal of seeds may be important in interpopulation gene flow for crimsoneyed rosemallow [22]. Inland populations are probably more genetically isolated [21].
Seed Production: Crimsoneyed rosemallow produces, on average, about 120 seeds/capsule. Insect seed predators often consume the round, hard-coated seeds [33].
Crimsoneyed rosemallow seeds are parasitized by 2 beetles (Althaeus hibisci and Conotrachelus fissunguis) and a leafroller (Chinonodes hibiscella), which can adversely affect its reproductive success [4,8,21,34].
Seed Dispersal: Crimsoneyed rosemallow seed is dispersed by water [5,8,21,33]. High storm tides may carry seeds for long distances [5]. Seeds are thick-coated and buoyant, making water dispersal possible after they have fallen from the fruits [22]. The seeds may be dispersed by waterfowl [4,8]. Soil-hauling machinery may also transport crimsoneyed rosemallow seeds [8].
Seed Banking: Some evidence suggests that common rosemallow is capable of forming a seed bank. A study by Baskin and Baskin reports that common rosemallow seeds sown in 1989 continued to germinate, in a greenhouse setting, for 4 years [3]. Similarly, Leck and Graveline [25] report that viable common rosemallow seeds germinated from soils taken from a freshwater tidal marsh in New Jersey. Populations in interior Ontario probably established from soil-stored seed transported to inland sites as landfill [8].
Germination: Crimsoneyed rosemallow seeds have physical dormancy due to a hard seed coat that is impermeable to water [3,26]. Scarification is apparently needed for imbibition and subsequent germination to occur [26].
Vegetative Regeneration: Crimsoneyed rosemallow sprouts from the caudex [4,21,22,26,32]. Some western populations sprout from rhizomes [6].
Crimsoneyed rosemallow plants growing near shorelines can become fragmented and dispersed in floating plant clumps [8].
Growth: Accounting for herbivory, net aerial productivity of common rosemallow on the Choptank River of Maryland averaged 1,200 g/m²/year. Time required for total decomposition of stem material was estimated at 7 to 8 years; about 5 times slower than stems of cattails (Typha spp.), bulrushes (Scirpus spp.), or common reed (Phragmites australis) [21].SITE CHARACTERISTICS:
Crimsoneyed rosemallow is common in marshes and wetlands [1,6,12,29]. In
Virginia, common rosemallow also occurs in salt scrub habitats occupying higher,
irregularly flooded landscapes in a mosaic with low, diurnally flooded saltmarshes that are strongly
influenced by high winds and salt spray typical of maritime environments [12].
General site characteristics for crimsoneyed rosemallow | |
State or region | Site characteristics |
Florida | marshes, swamps, floodplains, and riverbanks [7,40] |
Michigan | marshes, river bottoms, and often adjacent to disturbed ground [37] |
New York | freshwater and brackish marshes [10] |
Texas | wet areas [9] |
Virginia | tidal marshes and wetlands [12] |
West Virginia | riverbanks and marshes; frequent in coastal marshes [35] |
Blue Ridge Mountains (North Carolina, South Carolina, Tennessee, Virginia) | moist woods, meadows, and marshes [39] |
Carolinas | edges of swamp forests, alluvial meadows, and brackish marshes [30] |
Great Plains | marshes, swamps, and wet meadows [15] |
Flowering periods for crimsoneyed rosemallow | |
State or region | Anthesis period |
Maryland | July-Septmeber [21] |
Florida | June to August [7] |
Illinois | July to September [28] |
New York | July to August [10] |
Texas | June to October [9] |
West Virginia | July to September [35] |
Blue Ridge (North Carolina, South Carolina, Tennessee, Virginia) | June to September [39] |
Carolinas | June to September [30] |
Great Plains | June to October [15] |
Fire regime information on vegetation communities in which crimsoneyed rosemallow may occur. For each community, fire regime characteristics are taken from the LANDFIRE Rapid Assessment Vegetation Models [24]. These vegetation models were developed by local experts using available literature, local data, and expert opinion as documented in the PDF file linked from the name of each Potential Natural Vegetation Group listed below. Cells are blank where information is not available in the Rapid Assessment Vegetation Model. | ||||||||
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California | ||||||||
Vegetation Community (Potential Natural Vegetation Group) | Fire severity* | Fire regime characteristics | ||||||
Percent of fires | Mean interval (years) |
Minimum interval (years) |
Maximum interval (years) |
|||||
California Grassland | ||||||||
Herbaceous wetland | Replacement | 70% | 15 | |||||
Mixed | 30% | 35 | ||||||
Northeast | ||||||||
Vegetation Community (Potential Natural Vegetation Group) | Fire severity* | Fire regime characteristics | ||||||
Percent of fires | Mean interval (years) |
Minimum interval (years) |
Maximum interval (years) |
|||||
Northeast Grassland | ||||||||
Northern coastal marsh | Replacement | 97% | 7 | 2 | 50 | |||
Mixed | 3% | 265 | 20 | |||||
Southeast | ||||||||
Vegetation Community (Potential Natural Vegetation Group) | Fire severity* | Fire regime characteristics | ||||||
Percent of fires | Mean interval (years) |
Minimum interval (years) |
Maximum interval (years) |
|||||
Southeast Grassland | ||||||||
Floodplain marsh | Replacement | 100% | 4 | 3 | 30 | |||
Southern tidal brackish to freshwater marsh | Replacement | 100% | 5 | |||||
Southeast Forested | ||||||||
Maritime forest | Replacement | 18% | 40 | 500 | ||||
Mixed | 2% | 310 | 100 | 500 | ||||
Surface or low | 80% | 9 | 3 | 50 | ||||
South Florida coastal prairie-mangrove swamp | Replacement | 76% | 25 | |||||
Mixed | 24% | 80 | ||||||
*Fire Severities— Replacement: Any fire that causes greater than 75% top removal of a vegetation-fuel type, resulting in general replacement of existing vegetation; may or may not cause a lethal effect on the plants. Mixed: Any fire burning more than 5% of an area that does not qualify as a replacement, surface, or low-severity fire; includes mosaic and other fires that are intermediate in effects. Surface or low: Any fire that causes less than 25% upper layer replacement and/or removal in a vegetation-fuel class but burns 5% or more of the area [17,23]. |
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