Clematis Vitalba L

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Clematis vitalba L. Commonly known as old man’s beard, Clematis vitalba is a perennial vine with climbing, woody stems that can grow 20 to 30 metres long. Native to Europe and south-western Asia C. vitalba is reported to be invasive in New Zealand, the USA and Poland In the native ranges C. vitalba is associated with chalk and limestone areas, but outside of its native range, this species is found in forestlands and in the margins and openings of forested lands. It is also found in riparian areas established with willows, in waste areas, and in coastal and lowland areas. This species physically smothers and collapses indigenous forest and causes a loss of indigenous plant species. When this loss occurs there livestock. C.is vitalbaan influx is listedof exotic on theplants New into Zealand gaps Plantor grazing Pest Accorddamage that by prevents its sale, distribution, or propagation within New Photo credit: USDA (PLANTS Database) [Link] Zealand. C. vitalba reduced following the infestation of C. vitalba correlates with Washington and a ‘Quarantine and B designated’ weed in Oregon observations of the growth habit of C. vitalba. Ogle et al. showed in the USA. is also listed as a ‘Class C noxious weed’ in e.g. that not a single canopy tree species had been lost from the Ogle et al. (2000) observe that the vines ascend to the canopy Taihape Reserves though 25% or so of the understorey trees and of forest but are unable to climb large diameter emergent trees shrubs species had been lost. unless shrubs and smaller trees provide a series of ‘stepping Control using a combination of mechanical and chemical methods Taihape reserve, New Zealand) indicate that the numbers and conducted in the hopes of discovering biological means to control varietystones’ toof theunderstorey crown of talltrees trees. and Their shrubs study that findings have been (study severely area thiscan speciesbe effective (See Gourlaybut is very et al. expensive. 2000) Much research is being References: Global Invasive Species Database (GISD), 2011. Clematis vitalba L. Ogle, C. C., G. D. La Cock, G. Arnold, and N. Mickleson. 2000. Impact of an exotic vine Clematis vitalba (F. Ranunculaceae) and of control measures on plant biodiversity in indigenous forest, Taihape, New Zealand. Austral Ecology 25: 539-551 Click here to view archives of previous weeks’ species.

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Oregon City Nuisance Plant List
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Mechanical Architecture and Development in Clematis
Research MechanicalBlackwell Publishing Ltd. architecture and development in Clematis: implications for canalised evolution of growth forms S. Isnard1, T. Speck2 and N. P. Rowe1 1Botanique et Bioinformatique de l’Architecture des Plantes, UMR 5120 CNRS, TA40/PS2, Boulevard de la Lironde, 34398 Montpellier, France; 2Plant Biomechanics Group, Institute for Biology II, Botanical Garden of the Albert-Ludwigs-Universität, Schänzlestrasse 1, D-79104 Freiburg, Germany Summary Author for correspondence: • Mechanical architectures of two Clematis species, the herbaceous perennial S. Isnard Clematis recta and the woody liana, Clematis vitalba, were investigated and + Tel: 33 (0) 467617553 compared with the woody rhizomatous sand dune plant Clematis flammula var. Fax: +33 (0) 467615668 Email: [email protected] maritima. • Bending mechanical properties of stems from various developmental stages were Received: 25 September 2002 compared and related to stem geometry and relative proportions of tissues during Accepted: 28 February 2003 development. doi: 10.1046/j.1469-8137.2003.00771.x • Clematis vitalba and C. flammula var. maritima showed mechanical architectures with reductions in structural Young’s modulus of the stem during ontogeny. Irrever- sible loss of stem rigidity was mediated by disruption, separation and eventual loss of primary phloem fibres via secondary growth of the periderm and cambial activity. Each species showed variations of non-self-supporting mechanical architecture relating to specific habitat preferences. In aerial stems of C. recta the structural Young’s modulus remained approximately constant during ontogeny, a mechanical signal characteristic for semi-self-supporting architectures. •Woody aerial plant stems are extremely rare in the Ranunculaceae and seldom, if ever, show self-supporting characteristics.
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About Old Man’s Beard Clematis Clematis vitalba is a deciduous, woody vine that can grow over 65 feet in length or height. The leaves are pinnately compound, Old Man’s Beard consisting of usually 5 leaflets. The leaflet If you would like weed identification, site-specific control recommendations or margins are usually entire, but variable Clematis and sometimes 3-lobed. Plants reproduce by additional noxious weed information, contact the San Juan County Noxious (Clematis vitalba) fragmentation, rooting at stem nodes, and prolific amounts of seed (as many as 3,400 per Weed Control Program. sq. ft.). Seeds are primarily spread by wind, wildlife, water and disturbance. The common Class C Noxious Weed name, old man’s beard, is from the seed stage of the flower, when a mass of white, feathery styles extend from the small hairy seeds, which aid in further dispersal. (Control required in San Juan County) Why control Clematis vitalba? The rapid growth rate of the heavy vines can aggressively smother forbs, shrubs, and trees. The heavy biomass that forms in infested forest canopies creates hazards from falling debris, San Juan County Noxious provides ladder fuel for wildfires, and also Weed Control Program increases a tree’s susceptibility to windfall. The 2020 dense growth of woody vines that forms in forest understories are exceedingly difficult to control once established. It provides extremely poor habitat for local wildlife and insects. Before you begin: P.O. Box 1634 Create a plan for restoration before removing or weeds or disturbing the soil. C. vitalba seeds 62 Henry Road #26 germinate much more easily on disturbed soil.
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Clematis Vitalba
Clematis vitalba COMMON NAME Old man’s beard FAMILY Ranunculaceae FLORA CATEGORY Vascular – Exotic STRUCTURAL CLASS Lianes & Related Trailing Plants - Dicotyledons NVS CODE CLEVIT HABITAT Terrestrial. A plant of coastal and lowland areas. Plant grows in moderate to high fertile sites with medium to good drainage. The plant is light demanding. Plant grows in tall forest, low forest, scrub and shrubland. Motueka River, Jan. Photographer: John Smith- Occurs in reserves and forests with well-lit forest margins and wide Dodsworth tracks, waterways or clearings, riparian vegetation, exotic or native. The plant occurs in forest remnants. FEATURES Deciduous, climbing, layering, vine to 20 m tall. Stems very long, woody, with 6 prominent ribs (appear as furrows in older vines) and pale, easily rubbed-off bark. Leaves opposite, comprising 5 (rarely 3) widely spaced leaflets, falling in Autumn. Leaflets thin and papery, sparsely hairy, bluntly toothed or entire. Flowers 2-3 cm diam, creamy white, fragrant, Dec-May. Seeds grey, hairy, 2-3 mm long; with distinctive white-plumes, 3-4 cm long, in dense, fluffy clusters persisting over winter. SIMILAR TAXA Sometimes confused with native Clematis spp, especially C. paniculata. Note all native Clematis spp. are evergreen, have 3 leaflets (except the leafless C. afoliata), unfurrowed stems, and flower Aug-Dec. All exotic, wild species are deciduous and flower Dec-May (except the sparingly weedy, pink-flowered C. montana which flowers Oct- Dec). Other adventive species include C. flammula, which has 2-pinnate leaves, and the yellow flowered C. tangutica. Silverstream, Upper Hutt. Jun 2006. FLOWERING Photographer: Jeremy Rolfe December, January, February, March, April, May FLOWER COLOURS Cream, White FRUITING March-Oct YEAR NATURALISED 1940 ORIGIN Europe, SW Asia REASON FOR INTRODUCTION Ornamental CONTROL TECHNIQUES Technique 1 Biological control agents may be suitable to control the weed, especially if it is common but this is unlikely to eradicate the species and other techniques below will be needed.
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