| 单词 | nyssa | 
| 释义 | Nyssan. Botany.   A genus of North American and Asian trees of the family  Cornaceae, having small greenish flowers, berry-like fruits, and often colourful foliage in the autumn; (also  nyssa) a tree of this genus; esp. the black gum,  Nyssa sylvatica. Cf. tupelo n.Valid publication of the genus name: Linnaeus  Species Plantarum (1753) II. 1058, after earlier use by J. F. Gronovius (1686–1762), cited in Linnaeus  Systema Naturæ (1735), and published in J. F. Gronovius  Flora Virginica (1739–43) 121. ΘΚΠ the world > plants > particular plants > cultivated or valued plants > particular timber trees or shrubs > non-British timber trees > 			[noun]		 > tupelo gum tree1676 black-gum1709 white gum1709 tupelo1731 Nyssa1754 sour gum1814 pipperidge1823 pepperidge1826 1754    New & Compl. Dict. Arts & Sci. III. 2242/2  				Nyssa, in botany, a genus of the dioecia decandria class of plants, the flower of which is divided into five segments... It is a native of Virginia. 1797    Encycl. Brit. XIII. 164/2  				Nyssa, in botany: A genus of the order of diœcia, belonging to the polygamia class of plants, and in the natural method ranking under the 12th order, Holoraceæ. 1823    E. James Acct. Exped. Rocky Mts. III. xi. 183  				The country back of the town is hilly, covered with heavy forests of oak, tulip tree, and nyssa. 1853    A. Gray Bot. Text-bk. 		(ed. 4)	 136 		(note)	  				A tree of Nyssa, found..in Louisiana, which continued to live after the trunk was extensively stripped of its bark. 1886    G. Nicholson Illustr. Dict. Gardening II. 461/1  				Nyssas thrive best in low, damp, moist situations, such as peat swamps. 1901    Cycl. Amer. Hort.: N–Q 1109/2  				Nyssas are trees or shrubs with petiolate, usually entire leaves and small flowers borne in short racemes or dense heads. 1961    Amateur Gardening 23 Sept. 3/3  				The tulip tree..and the nyssa in the Long Walk to the Pagoda..are among the tallest trees in the Garden [at Kew]. 1997    Guardian 24 May (Weekend Suppl.) 51/1  				Many of these gardens are open to the public, their principal seasons of delight being spring and autumn, when exotics such as maple and nyssas take on brilliant leaf-fall colouring. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). <  | 
	
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