112 OCTANDRIA MONOGYNIA. Pol/gonum. 



ACER. Maple. 



A. Pseiido^ -Pldtanus. Great 31. or Sycamore. Leaves 

 five-lobed, unequally saw-toothed. Clusters drooping 

 E. B. 303. A. majus. G. E. 1484. 



Hedges, about houses. 



Tree. May. 



Bark smooth, ash-coloured. Ls. large, strongly veined. FL 



clusters axillar^^ long, many^. Cor. pet. green, much like the 



cal. segm. Fruit seed-wings often three, ripen in August ; not 



so straddling as in A. campestre. 



Handsome, quick-growing tree, not injurious to gi'ass, but the Is. 

 fall early. Wood soft. Sap sugary, made into wine in Scotch 

 Highlands. Flourishes on a sandy soil : bears transplanting 

 well: grows best near the sea. See Gent. Blag. 1757. p. 252. Its 

 pollen, a curious microscopic object : when moistened, the globules 

 burst into four cross-like valves. 



A. campestre. Common M. Leaves five-lobed, blunt, 

 somewhat cut. Clusters corymbose, erect. E. B. 

 304. A. mmus. G. E. 1484. 



Hedges, thickets. 



Tree. June. 



Small tree. Branches straddling. Bark smooth : that of the 



stem fissured. Ls. smaller than in most of our trees, opposite. 



FL green, much like those of A. Pseudo-platan us. Caps, much 



straddling. 



Wood compact, fine grained, beautifully veined. The Romans 

 set a high value on their tables of veined Maple-wood. Vessels of 

 this wood turned so thin as to transmit light. 



OCTANDRIA TRIGYNIA. 



POLY'GONUM.^ Persicaria, Bistort, Knot-grass, and 

 Buck-wheat. 



* Styles usually but two. 



P. ampMhium. Amphibious Persicaria. Styles two, 

 united half way up. Stamens five. Spike egg-shaped. 

 E. B. 436. C. 4. 28. P. angustifolium. G. E. 821. 



' i. e. false (plane.) 



2 Polm, Gr. much, and gomi, Gr. a knee ; from the stalks perhaps being 

 genicnlated or kneed. 



