Pyrus calleryana
Pyrus calleryana
Safety & Hazards
The pollen can be bothersome to people with allergies[ 372 Title Flowers of India Publication Author Website http://www.flowersofindia.net/ Publisher Year 0 ISBN Description A wed site of native Indian plants, plus cultivated and naturalized species. It has good quality photos and terse details on more than 3,000 species and cultivars. ]. Although no specific information has been seen for this plant, the seed of many species in the family Rosaceae are likely to contain cyanogenic glycosides. When injested, these compounds break down in the digestive tract to release cyanide. Used in small quantities in both traditional and conventional medicine, this exceedingly poisonous compound has been shown to stimulate respiration, improve digestion, and promote a sense of well-being[ 238 Title Encyclopaedia of Herbs and their Uses. Publication Author Bown. D. Publisher Dorling Kindersley, London. Year 1995 ISBN 0-7513-020-31 Description A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant. ]. It is also claimed by some to be of benefit in the treatment of cancer - though this claim has been largely refuted. In larger concentrations, however, cyanide can cause gasping, weakness, excitement, pupil dilation, spasms, convulsions, coma and respiratory failure leading to death[ 293 Title Poisonous Plants of North Carolina Publication Author Website http://www.ces.ncsu.edu/depts/hort/consumer/poison/poison.htm Publisher Year 0 ISBN Description An excellent concise but comprehensive guide to toxic plants that grow in N. Carolina. It lists even those plants that are of very low toxicity, including several well-known food plants such as carrots and potatoes. ]. The levels of toxin can be detected by the level of bitterness:- sweet almonds, for example, contain only very low levels of it and are safe to eat in quantity, whilst bitter almonds (which are used as a flavouring in foods such as marzipan) contain much higher levels and should only be eaten in very small quantities. Great caution should be employed if the taste is moderately to very bitter[ K Title Plants for a Future Author Ken Fern Description Notes from observations, tasting etc at Plants For A Future and on field trips. ].
Botanical Description
Pyrus calleryana is an unarmed, deciduous tree with a narrow, conical crown, it usually grows 5 - 8 metres tall, sometimes reaching 15 metres tall but sometimes only a shrub[ 266 Title Flora of China Publication Author Website http://flora.huh.harvard.edu/china/ Publisher Missouri Botanical Garden Press; St. Louis. Year 1994 ISBN Description An excellent, comprehensive resource in 25 volumes. In addition to the botanical information the flora also gives basic information on habitat and some uses. An on-line version is also available. , 372 Title Flowers of India Publication Author Website http://www.flowersofindia.net/ Publisher Year 0 ISBN Description A wed site of native Indian plants, plus cultivated and naturalized species. It has good quality photos and terse details on more than 3,000 species and cultivars. , 1212 Title New Trees Publication Author Grimshaw J.; Bayton R.; Wilks H. Publisher Kew Publishing; London Year 2009 ISBN 1842461737 Description Provides comprehensive botanical descriptions and horticultural commentary on over 800 tree species that have been introduced to cultivation in recent decades. , 1213 Title Southern Trees Fact Sheets Publication Author Gilman E.F. Website http://edis.ifas.ufl.edu/department_envhort-trees Publisher University of Florida, IFAS Extension Year 0 ISBN Description A series of fact sheets on trees that can be grown in Florida. They can be downloaded from the Internet ]. The tree is harvested from the wild for local use as a food and source of materials. It is widely used as a rootstock in China and is also often grown as an ornamental. The cultivar 'Bradford', which produces sterile fruits, has been widely planted throughout the United States since the early 1900s, but recent cultivars, which have been bred to reduce the tendency of the tree to split in snow or high winds, have produced viable seeds. These seeds have been spread into the envoronment by fruit-eating animals, especially birds, and plants developing from these seeds have become established in various areas of eastern N. America. Pyrus calleryana often invades disturbed areas and can disrupt the establishment of middle to late successional species, sometimes forming dense thorny thickets that are impenetrable to humans[ 413 Title Global Invasive Species Database Publication Author Website http://www.issg.org/database/welcome/ Publisher Year 0 ISBN Description Very detailed information on almost 400 species (with more being added) of plants that have become weeds in areas outside their native range. ].