SCIENTIFIC AND POPULAR. 11 



16. ACInTHUS.L. - Acanthus. - Acaiithaccae. 



Ancient Greek name of any thorny or prickly plant, ap- 

 plied later particularly to this genus. Kobust herbs with orna- 

 mental foliage. About 15 species, Mediterranean region. 



a, A. mollis L. Southern Europe. Acanthus, Bran c-ursine, Bear* & 

 breech, Culberdill||, Sedocke||. 



16. ACER, L. - Maple. - Aceraceae. [Sapindaceas.] 



The Latin name, from "pointed" lobes of the leaves. Syn. 

 Negundo, in part. Trees and shrubs. About 100 species, 

 North temperate zone; 15 in U. S. 



a. A. nigrum Michx. (A. saccharinum, var nigrum T. & Gr. ) 



Ontario to Alabama, west to Louisiana and Minnesota. Black 

 Sugar Maple, Black Maple, Hard Maple. Sap rich in sugar. 



b. A. Negiindo L. (Negundo aceroides Moench, N. Negundo (L. ) 



Karst. ). Ontario to Mexico, but rare near Atlantic coast. 

 Ash-leaved Maple, Box Elder, Cut-leaved or Red River Maple,. 

 Black Ash*, Maple Ash, Water Ash, Sugar Maple*. 



c. A. Peunsylyaniciim L. (A. striatum Du Roi). Nova Scotia, 



south to Tennessee. Striped or Goose-foot Maple, Northern 

 Maple, Moosewood, False or Striped Dogwood, Whistle-wood, 



d. A. Pseud 0- PI atamis L. Europe and western Asia, cult, in 



U. S. Sycamore Maple, SuccamoreJ, Spurious or Mock Plane- 

 tree, Whistle- wood. 



e. A. rvibrum L. Canada to Florida and Texas. Red, Scarlet or 



Water Maple, Swamp Maple; White, Hard or Shoe-peg Maple, 

 also Soft Maple^. 



f. A. saccharinum L. (A. dasycarpum Erhr., A. eriocarpum 



Michx. ). Canada to Florida, west to Indian Territory and Da- 

 kota. Silver or Silver-leaf Maple, Soft or White Maple; Creek, 

 River, Swamp or AVater Maple, Red Maple*. Sap yields com- 

 paratively little sugar. 



g. A. Sdcchfirum Marsh (A. saccharinum Wang, not L., A. bar- 



batum Michx. ). Canada to Florida, west to Texas and Nebras- 

 ka. Sugar Maple, Rock Maple, Sugar Tree, Black Maple. 

 Sop the source of most of the maple sugar, 



h. A. spicatum Lam, (A. montanum Ait.). Canada to N. Caro- 

 lina, west to Minnesota. Mountain Maple; Low, Moose, Swamp 

 or Water Maple. 



17. ACERATES, Ell. 1817. Milk-weed*. Asclepiadaceae. 



From Greek, "hornless," of the corona. Syn. Polyotus, 

 Nutt., 1835., Asclepias in part. Milky perennial herbs, resemb- 

 ling Asclepias. Seven species. North America; 5 in U. S. 



18. ACHILLEjV. L. - Yarrow, Milfoil. - Compositae. 



Greek name, the plant with which '* Achilles" healed Tele- 

 phus. Herbs, mostly perennial, with numerous small flower- 

 heads. About 75 species, mostly of Old World; 3 nat. in V. S. 



