Species Ratings for Landscape Tree Appraisal in Southern Nevada

Transcription

1 Species Ratings for Landscape Tree Appraisal in Southern Nevada This document establishes species ratings to be used by tree appraisal experts with the trunk formula method for appraising the monetary value of trees in Southern Nevada. From time to time, the dollar value of a landscape tree needs to be determined for insurance purposes, tree inventories etc.. The Trunk Formula Method is the most widely used way to determine those values for larger trees. Once the basic value is determined, it is adjusted based on the species, condition, and location of the tree. This document provides a rating for each tree species commonly grown in Southern Nevada. [The complete tree appraisal procedure is described in detail in the Guide for Plant Appraisal prepared by the Council of Tree and Landscape Appraisers and published by the International Society of Arboriculture (9th edition, available from ISA, P.O. Box 3129, Champaign, IL ] Listed below are the species ratings of trees, by botanical name, known to be grown in Southern Nevada. The ratings are expressed as percentages between 5% to 100% (100 being the highest). The ratings are based on a tree s attributes such as growth characteristics, maintenance requirements, aesthetics, resistance to insect and/or disease infestations, drought tolerance and longevity. Each species is given a rating range of about 20 points within which most trees of that species will likely fall. Ratings should be adjusted within or even outside of the given range if local conditions require. Species ratings should be based only on overall species-related factors, without regard to condition or location factors that are tied to a specific tree and its site. These species ratings and the related appraisal methods are generally for trees in developed landscapes where the tree lends considerable aesthetic and functional contribution to the site. Appraisal of landscape trees and adjustment of the species ratings included in this document should only be performed by persons familiar in use of the appraisal techniques. These persons must also be knowledgeable about the species involved, site conditions, and about trees and tree biology. The species ratings below are based on the knowledge and opinions of several experts involved in tree care in the area. We welcome input and advice. Contact: Southern Nevada Arborist Group PMB # E. Tropicana Ave. Las Vegas, NV

2 BOTANICAL CULTIVAR COMMON % RATING % Abies concolor White Fir Acacia aneura Mulga Acacia baileyana Acacia, Bailey Acacia constricta White Thorn Acacia Acacia greggii Catsclaw Acacia Acacia schaffneri Twisted Acacia Acacia smallii 'Farnesiana' Acacia, Sweet Acacia stenophylla Acacia, Shoestring Albizia julibrissin Silk tree or Mimosa Aracastrum Palm, Queen romanzoffianum Arbutus unedo Strawberry Tree Brachychiton acerifolium BottleTtree, Australian (flame) Brachychiton populneus BottleTree Brahea armata Palm, Mexican Blue Butia capitata Palm, Pindo Callistemon citrinus Bottlebrush, Lemon Callistemon viminalis Bottlebrush,Brilliant (weeping) Carya llinoensis Pecan Casuarina equisetifolia Beefwood,Horsetail Casuarina stricta Beefwood, Coast Catalpa bignioides Catalpa, Common Cedrus atlantica 'Glauca' Cedar, Blue Atlas Cedrus deodara Cedar, Deodar Celtis occidentalis Hackberry, Common Celtis reticulata Hackberry, Western (douglasii) Ceratonia siliqua Carob Cercidium X 'Desert Desert Museum Museum' Palo Verde Cercidium floridum Palo Verde, Blue Cercidium microphyllum Palo Verde,Littleleaf Cercis canadensis Redbud, Eastern Cercis occidentalis Redbud, Western Cercocarpus ledifolius Mahogany, Mountain Chamaerops humilis Palm, Mediterranean Fan x Chitalpa Chitalpa tashkentensis Chilopsis linearis Willow, Desert Citrus aurantiifolia tree-sized Lime Citrus limon Lemon Citrus meyeri tree-sized Meyer Lemon Cordi boissieri Texas Olive Cotinus coggygria Smoke Tree Cupressocyparis Cypress, Leyland 5-20 leylandii Cupressus arizonica Cypress, Arizona Cupressus glabra Cypress, Smooth Arizona Cupressus Cypress, Italian sempervirens Cycas revoluta Sago Palm Dalbergia sissoo Sissoo Elaeagnus angustifolia Olive, Russian 5-20 Eriobotrya deflexa Loquat, Bronze Eriobotrya japonica Loquat Japanese Eucalyptus microtheca Coolibah Tree Eucalyptus polyanthemos Gum, Silver Dollar 40-60

3 Eucalyptus rudis Gum, Swamp Eucalyptus sideroxylon Ironbark, Pink or Red Eucalyptus spathulata Narrow-leaved Gimlet Eysenhardtia Kidneywood orthocarpa Feijoa sellowiana Guava, Pineapple Ficus carica Fig, Common, Edible Fraxinus greggii Littleleaf Ash Fraxinus oxycarpa 'Raywood' Ash, Raywood Fraxinus uhdei Ash, Shamel Fraxinus velutina Ash, Arizona Fraxinus velutina 'Rio Grande' Ash, Fan Tex Fraxinus velutina glabra Ash, Modesto Geijera parviflora Willow, Australian Ginkgo biloba male cultivars Maidenhair tree Gleditsia triacanthos cultivars Locust, Common Honey Ilex x altaclarensis 'Wilsonii' Holly, Wilson Jacaranda mimosifolia Jacaranda 5-20 Juniperus chinensis 'Kaizuka' Juniper, Hollywood Koelreuteria bipinnata Flame tree, Chinese Koelreuteria paniculata Rain Tree, Golden Lagerstroemia hybrids Crape Myrtle Hybrids Lagerstroemia indica Crape Myrtle Laurus nobillis Laurel, Grecian Ligustrum japonicum Privet, Japanese Ligustrum lucidum Privet, Glossy Magnolia grandiflora Magnolia, Southern Malus species Crabapple Melia azedarach 'Umbraculiformis' Chinaberry (Umbrella tree) Morus alba 'Fruitless' Mulbery, White, Fruitless Nerium oleander 'Standard' Oleander Olea europae Olive, Common Olea europae 'Swan Hill' Swan Hill Fruitless Olive Olea europae Wilson Wilson Fruitless Olive Parkinsonia aculeata Palo Verde, Texas Paulownia tomentosa Empress Tree 5-20 Phoenix canariensis Palm, Date, Canary Island Phoenix dactylifera Palm, Date Phoenix reclinata Palm, Date, Senegal Photinia fraseri Photina, Redleaf Photinia serrulata Photinia, Chinese Pinus aristata Pine, bristlecone Pinus canariensis Pine, Canary Island Pinus edulis Pine, Pinon Pinus eldarica Pine, Mondel Pinus halepensis Pine, Aleppo Pinus monophylla Pine, Single Leaf Pinon Pinus mugo Pine, Mugo Pinus pinea Pine, Italian Stone Pinus ponderosa Pine, Ponderosa Pinus roxburghii Pine, Chir Pinus thunbergiana Pine, Japanese Black Pistachia atlantica Pistache, Mt. Atlas Pistacia chinensis Pistache, Chinese Pistacia vera Pistachio Nut Tree 40-60

4 Pithecellobium Ebony, Texas flexicaule Pittosporum Pittosporum, Willow phillyraeoides Platanus racemosa Sycamore, California Platanus wrightii Sycamore, Arizona Platanus x acerifolla London Plane Platanus x acerifolla 'Bloodgood' Sycamore, London Plane Podocarpus gracilior Pine, Fern Podocarpus Pine, Yew Podocarpus macrophyllus Populus alba Poplar, White Populus fremontii Cottonwood, Fremont Western Populus nigra 'Italica' Poplar, Lombardy 5-20 Prosopis hybrid Hybrid Mesquite Prsopis alba Argentine Mesquite Prosopis pubescens Screwbean Mesquuite Prosopis torryana Native Mesquite Prosopis velutina Native Mesquite Prunus amygdalus Almond, Edible Prunus caroliniana Cherry Laurel, Carolina Prunus cerasifera 'Pissardii' Plum, Purple Leaf Plum Prunus cerasifera 'Krauter's Purple Leaf Plum vesuvius' Prunus cerasifera 'Thundercloud' Purple Leaf Plum Prunus dulcis Apricot, Edible Prunus dulcis Almond, Edible Prunus persica Peach Prunus x blireiana Plum, Blirelana Purple Punica granatum Pomegranate Pyrus calleryana cultivars Pear, Callery Pyrus calleryana Bradford Bradford Ornamental Pear Pyrus communis Pear Pyrus kawakamii Pear, Evergreen Quercus fusiformis Escarpment Oak Quercus ilex Oak, Holly Quercus lobata Oak, Valley Quercus macrocarpa Oak, Mossy Cup Bur Quercus muehlenbergii Oak, Chinkapin Quercus texana Texas Red Oak (buckleyi) Quercus virginiana Oak, Southern Live Rhaphiolepis 'Majestic Beauty'Majestic Beauty Indian Hawthorn Rhus lancea Sumac, African Robinia pseudoacacia Locust, Black Robinia x ambigua 'Idahoensis' Locust, Idaho Salix babylonica Willow, Weeping 5-20 Salix goodingii Gooding's Willow Salix matsudana 'Navajo' Willow, Navajo Globe Sambucus sp. Elderberry Sapium sebiferum Tallow Tree, Chinese Schinus molle Pepper Tree, California Sophora secundiflora Texas Mountain Laurel Tamarix aphylla Tamarisk 5-20 Thuja occidentalis Arborvitae Thuja orientalis Arborvitae, Oriental Trachycarpus fortunei Palm, Windmill 60-80

5 Ulmus parvifolia Elm, Chinese Evergreen Ulmus pumila Elm, Siberian 5-20 Vitex agnus-castus Chaste Tree Washingtonia filifera Palm, California Fan Washingtonia robusta Palm, Mexican Fan Xylosma congestum Xylosma Yucca brevifolia Joshua Tree Zelkova serrata Zelkova, Japanese or Sawleaf Ziziphus jujuba Chinese Date; Jujube 60-80