Italian Arum Flyer

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PUBLIC ANNOUNCEMENT- WESTERN INVASIVES NETWORK Revised April, 2020 847 NW Monroe Ave. Corvallis, OR 97330 (541) 910-8769 Photo: Travis Johnson 1Photo: Liz West************ NOXIOUS WEED ALERT************ Italian Arum Italian arum (Arum italicum), also known as Digging and disposing of the small “orange candleflower” and “Italian lords and underground corms in the garbage can help. ladies,” is a non-native perennial that was However, manual removal is only introduced as an ornamental plant. It has recommended on small patches, because if now naturalized and appears to be the plant is not completely eradicated, the spreading. Arum italicum is a woodland soil disturbance can increase its spread. If species and prefers moist, well-shaded you have it on your land, do not let it go to environments. It’s extremely difficult to seed. Wearing gloves, cut and bag all seed eradicate once it becomes established and heads, and dispose of them in the garbage. may spread from residential gardens into The variegated, exotic leaves and showy red fruits woodland areas. For more info on Italian arum: make it an attractive garden plant. Unfortunately, Western Oregon is the perfect environment for Why is it a problem? WA Noxious Weed Control Board unwanted invasions. (Photo: East Multnomah SWCD) This plant is problematic because of its ability Lower Hudson PRISM to form a dense cover in open sites. It can out-compete native plants and prevent their The Western Invasives Network encourages establishment. you to report Italian arum, in an effort to inform future management priorities across Italian arum is also toxic to humans and western Oregon. (not currently listed by animals. All parts of Italian arum are state of Oregon) poisonous. Handling of the plant can cause skin irritation and ingestion can cause How Do I Report Italian Arum? swelling of the mouth, tongue and throat. Report Online at: Breathing difficulties can follow as well as https://oregoninvasiveshotline.org/ burning pain, upset stomach and even death. What Can You Do? -or- One of the best ways to control this plant is Call 1-866-INVADER to prevent its spread. Often, chemical control only burns back foliage and does not -or- hurt the corms (like bulbs) underground. Contact your local CWMA .

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Size Variations of Flowering Characters in Arum Italicum (Araceae)
M. GIBERNAU,]. ALBRE, 2008 101 Size Variations of Flowering Characters in Arum italicum (Araceae) Marc Gibernau· and Jerome Albre Universite Paul Sabatier Laboratoire d'Evolution & Diversite Biologique (UMR 5174) Bat.4R3-B2 31062 Toulouse cedex 9 France *e-mail: [email protected] ABSTRACT INTRODUCTION In Arum, bigger individuals should An extreme form of flowering character proportionally invest more in the female variations according to the size is gender function (number or weight of female modification, which occurs in several flowers) than the male. The aim of this species of Arisaema (Clay, 1993). Individ paper is to quantify variations in repro ual plant gender changes from pure male, ductive characters (size of the spadix when small, to monoecious (A. dracon parts, number of inflorescences) in rela tium) or pure female (A. ringens) when tion to plant and inflorescence sizes. The large (Gusman & Gusman, 2003). This appendix represents 44% of the spadix gender change is reversible, damaged length. The female zone length represents female individuals will flower as male the 16.5% of the spadix length and is much following year (Lovett Doust & Cavers, longer than the male zone (6%). Moreover 1982). These changes are related to change these three spadix zones increase with in plant size and are explained by the plant vigour indicating an increasing size-advantage model. The size-advantage investment into reproduction and pollina model postulates a sex change when an tor attraction. It appears that the length of increase in body size is related to differen appendix increased proportionally more tial abilities to produce or sire offspring than the lengths of the fertile zones.
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