ACERACEyE. 199 



Plate 174. 



ACER, Tourn. 



Flores polygami. Petala 5-8 (rarissime 4 s. 9-12), seu 

 nulla. Stamina 8, rarius 4-7, v. 9-12. Samara dicocca ; 

 coccis dorso in alam margine inferiore incrassatam productis. 

 — Folia simplicia, palmatiloba, rarissime palmatisecta. 



Acer, Tourn. Inst. p. 615. t. 386. Linn. Gen. 11.55 (excl. spec). Gaertn. 

 Fr. 2. 1. 116. Schk. Handb. t. 351-353. Michx. f. Sylv. 1. t. 

 40-45. Spach in Ann. Sci. Nat. (ser. 2.) 2. p. 160. Torr. &, 

 Gray, Fl. N. Am. 1. p. 246. Endl. Gen. 5558. 



Maple. 



Flowers by abortion dioeciously, or rarely monoeciously, 

 polygamous, occasionally truly perfect. Calyx colored, five- 

 (rarely 4- 12-) parted, sometimes only five-lobed, rarely 

 cup-shaped and obscurely toothed, deciduous, the lobes im- 

 bricated in sestivation. Disk thick, glandular, annular and 

 hypogynous, or cup-shaped and more or less perigynous, with 

 the margins free, and usually lobed ; the lobes (or glands) 

 alternate with the stamens. Petals wanting, or as many as 

 the lobes of the calyx, and of the same color, alternate with 

 them, inserted into the margin or base of the disk, equal, 

 erect, slightly unguiculate, imbricated in asstivation, decidu- 

 ous. Stamens 8, or from 4 to 9 or 12, seldom agreeing in 

 number with the petals or sepals, inserted on the summit or 

 inside of the disk : filaments distinct, filiform, commonly 

 shorter than the calyx in the fertile flowers and longer in the 

 sterile : anthers introrse, two-celled, the cells opening lon- 

 gitudinally ; they are abortive or imperfect in the pistillate 

 flowers. Pistil of two carpels : their ovaries united in the 

 axis, compressed contrary to the dissepiment, wing-margined 

 on the back: styles 2, linear-filiform, the whole inner face 

 stigmatose. Ovules two in each coll, collateral, rarely su- 



