Difference between revisions of "Asclepias verticillata"
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===Phenology===<!--Timing off flowering, fruiting, seed dispersal, and environmental triggers. Cite PanFlora website if appropriate: http://www.gilnelson.com/PanFlora/ --> | ===Phenology===<!--Timing off flowering, fruiting, seed dispersal, and environmental triggers. Cite PanFlora website if appropriate: http://www.gilnelson.com/PanFlora/ --> | ||
| − | It flowers and fruits from April to September<ref name="fsu"/><ref name="weakley"/>. It resprouts and flowers within a few weeks of being burned from early spring through summer, but it also flowers in years when it is not burned up to at least five years following fire, primarily in July and August in northern Florida and southern Georgia ([[KMR]]<ref>[[KMR]] observations at Pebble Hill Plantation Fire Plots near Thomasville, GA.</ref>). | + | It flowers and fruits from April to September<ref name="fsu"/><ref name="weakley"/>. It resprouts and flowers within a few weeks of being burned from early spring through summer, but it also flowers in years when it is not burned up to at least five years following fire, primarily in July and August in northern Florida and southern Georgia ([[KMR]]<ref>[[KMR]] observations at Pebble Hill Plantation Fire Plots near Thomasville, GA.</ref>). It is one of the last milkweed species to flower and is a common late season host plant for monarch larvae<ref name="monarch">[[http://monarchwatch.org/bring-back-the-monarchs/milkweed/milkweed-profiles/asclepias-verticillata/]]Monarch Watch. Accessed: March 31, 2016</ref>. |
===Seed dispersal=== | ===Seed dispersal=== | ||
Revision as of 09:35, 31 March 2016
| Asclepias verticillata | |
|---|---|
| |
| Photo taken by Gil Nelson | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Magnoliophyta - Flowering plants |
| Class: | Magnoliopsida - Dicotyledons |
| Order: | Gentianales |
| Family: | Asclepiadaceae |
| Genus: | Asclepias |
| Species: | A. verticillata |
| Binomial name | |
| Asclepias verticillata L. | |
| |
| Natural range of Asclepias verticillata from USDA NRCS Plants Database. | |
Common names: Whorled Milkweed
Contents
Taxonomic notes
Asclepias is named for Asklepio, the Greek god of medicine and healing[1]. Verticillata is Latin for whorled[2].
Description
In general, with the Asclepias genus, they are perennial herbs usually milky sap. The stems are erect, spreading or decumbent and usually are simple and often solitary. The leaves are opposite to subopposite, are sometimes whorled, and rarely alternate. The corolla lobes are reflexed and are rarely erect or spreading. The filaments are elaborate into five hood forming a corona around the gynosteguim. The corona horns are present in most species[3].
Specifically, for A. verticillata, the stems are simple or there is branching in the upper third portion. Grows approximately 3-8 dm tall and is pubescent in lines. There are numerous leaves that are whorled or subverticillate, are linear, and grow to be 3-7 cm long and 1-2 mm wide. The leaves are pubescent or glabrate and usually revolute. There are 2-8 umbels coming from the upper nodes, they are 2.2-5 cm broad. The peduncle is 1.5-2.5 cm long. The corolla is greenish white in color. The lobes are 3.5-4.5 mm long and have rose-purple tint at the tip of the lobes. The corona is 3-5 mm in diameter. The acicular horns are exserted. The follicles are erect and are 4.5-8.5 cm long and 4-6 mm broad. Flowers June to September; September to October[3].
Distribution
It is found from Massachusetts, south to Texas, east to Florida, and west to Arizona[4].
Ecology
Habitat
Native upland pine and pine-hardwood communities, loblolly pine plantations (Ultisols), borders of wetland depressions within pine communities, sandhills and sand ridges, (Entisols), open calcareous glades, bluffs along Apalachicola River[5]. It can be found in bluestem prairie. It increases with spring burning. It is a warm-season grass[6]. Can occur in areas with soil disturbance[5]. Thrives in frequently burned areas and flowers within two months of burning in the growing season (Robertson observation). Tolerates full sunlight to partial shade. Tolerates moist to xeric conditions but seems to be limited to sandy or calcareous soil. Found barrens of thin soils of rock outcrops (mafic rocks), also in woodlands and sandhills[4] and in flatwoods[7].
Associated species include Pinus palustris, Quercus laevis, Q. margaretta, Q. rubra, Tragia, Setaria, Panicum, Hedyotis, Euphorbia floridana, Gaillardia aestivalis, Rhynchospora globularis, Pteridium aquilinum, Polianthes, Fraxinus, Melanthera nivea, sweetgum, poison oak, mockernut hickory, and others[5].
Phenology
It flowers and fruits from April to September[5][4]. It resprouts and flowers within a few weeks of being burned from early spring through summer, but it also flowers in years when it is not burned up to at least five years following fire, primarily in July and August in northern Florida and southern Georgia (KMR[8]). It is one of the last milkweed species to flower and is a common late season host plant for monarch larvae[9].
Seed dispersal
Asclepias verticillata has seed pods that extend vertically from meristems near the top of the stem. Seeds are dispersed by wind after pod dehiscence. Seeds are up to 4 mm in diameter but have a large white coma facilitating distant seed dispersal (KMR[10]).
Pollination
Pollination of Asclepias is unusual. Pollen is contained in sacs (pollinia) located in the slits of the flower (stigmatic slits), when a pollinator walks across the flower head, these sacs attach to the pollinator and disperses on to another plant when the pollinator lands and walks[1]. There is no specialist insect pollinator[11]. Pollinated by Monarch butterflies[12].
Conservation and Management
Cultivation and restoration
Photo Gallery
References and notes
Robertson data. Dataset compiled at Pebble Hill Fire Plots from 2005 to 2015.
- ↑ 1.0 1.1 [[1]]Florida Native Plant Society. Accessed: March 30, 2016
- ↑ [[2]]North Creek Nurseries. Accessed: March 31, 2016
- ↑ 3.0 3.1 Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 848-850. Print.
- ↑ 4.0 4.1 4.2 Weakley, Alan S. Flora of the Southern and Mid-Atlantic States: Working Draft of 21 May 2015. University of North Carolina Herbarium (NCU). PDF. 933.
- ↑ 5.0 5.1 5.2 5.3 Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: July 2015. Collectors: Loran C. Anderson, Guy Anglin, Gary R. Knight, John B. Nelson, Robert L. Lazor, Robert K. Godfrey, R. Kral, R. R. Smith, T. Myint, N. C. Henderson, S. W. Leonard, Cecil R Slaughter, Jimmy Meeks, Brenda Herring, Don Herring, William Lindsey, S.C. Hood, Richard S. Mitchell, Kevin Oakes, Tom Hyde, R.A. Norris, Andre F. Clewell, R. Komarek, R. F. Doren, Chris Cooksey, M. Davis, MacClendons, G. Wilder. States and Counties: Florida: Leon, Lee, Walton, Washington , Okaloosa, Jackson, Gadsden, Jefferson, Pasco, Liberty, Taylor, Marion, Charlotte, Wakulla, Suwannee, Orange, Levy, Citrus, Escambia, Dixie, Georiga: Thomas. Compiled by Tall Timbers Research Station and Land Conservancy.
- ↑ Hover, E. I. and T. B. Bragg (1981). "Effect of season of burning and mowing on an eastern Nebraska Stipa-Andropogon prairie." American Midland Naturalist 105: 13-18.
- ↑ Wunderlin, Richard P. and Bruce F. Hansen. Guide to the Vascular Plants of Florida. Third edition. 2011. University Press of Florida: Gainesville/Tallahassee/Tampa/Boca Raton/Pensacola/Orlando/Miami/Jacksonville/Ft. Myers. 271. Print.
- ↑ KMR observations at Pebble Hill Plantation Fire Plots near Thomasville, GA.
- ↑ [[3]]Monarch Watch. Accessed: March 31, 2016
- ↑ Observations at Pebble Hill Plantation near Thomsville, Georgia
- ↑ [[4]]Xerces Society. Accessed: March 30, 2016
- ↑ Cite error: Invalid
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