POMACEAE 173 



3. Rosa Carolina L. Swamp Rose. (Man. p. 513 ; I. F./. /970.) In 

 low grounds and swamps, Quebec to Minn., south to Fla. and Miss. 

 — Pennsylvania : Monroe ; Northampton ; Bucks ; Delaware ; 

 Chester ; IvAncaster ; Eranki<in ; Erie. ; Ali,egheny. 



4. Rosa humilis Marsh. Low or Pasture RoiSE. (Man. p. 514; 

 I. F./. 1971 ■) In dry or rocky soil, Me. and Ont. to Wis., south to Ga. 

 and I,a. — Pennsylvania: Monroe; Northampton; Bucks; Lancas- 

 ter ; Franklin ; Huntingdon ; Allegheny. 



4a. R. humilis villosa Best. (Man. p. 514.) N. J., Pa. and southern 

 N. Y. — Pennsylvania . Bucks. 



5. Rosa luoida Ehrh. Shining Rose. (Man. p. 514.) On shores 

 or in sandy soil, Newf. and Ont. to N. J. and Pa. — Pennsylvania : 

 Northampton ; Bucks ; Chester ; LuzernE; Lancaster; Columbia ; 

 Franklin ; Allegheny. 



6. Rosa canina L. DoG ROSE. Canker Rose. (Man. p. 514; I. 

 F. f. 1973.) In waste places, and along roadsides, N. S., N. J. and Pa. 

 Also in Tenn. Adv. or uat. from Eu. — Pennsylvania : Northampton ; 

 Bucks ; Schuylkill, Pottsville. 



7. Rosa rubiginosa L. SwEETbrier. (Man. p. 514; I. F. /. ^974.) 

 In waste places, N. S. to Ont., Va. and Tenn. — Pennsylvania : Monroe ; 

 Northampton ; Wayne ; Bucks ; Delaware ; Chester ; York ; 

 Lancaster ; Lebanon ; Huntingdon ; Erie ; Allegheny. ' 



Family 12. POMACEAE L. Apple Family. 



Carpels papery or leathery at maturity. 

 Leaf -blades pinnately compound. i . SoRBUS. 



Leaf-blades simple, entire, toothed or lobed. 

 Cavities of the ovary (carpels) as many as the styles. 

 Flesh of the pome with grit-cells. j:. Pyrus. 



Flesh of the pome without grit-cells. 

 Cymes simple. 3. Malus. 



Cym.es compound. 4. Aronia. 



Cavities of the ovary becoming twice as many as the styles. 



5. Amelanchier. 

 Carpels bony at maturity. 

 Ovule I in each carpel, or, if two, dissimilar. 6. Crataegus. 



Ovules 2 in each carpel, alike. 7. Cotoneaster. 



1. SORBTJS L. 



Fruit less than 6.5 mm. in diameter : leaflets with long acuminate blades. 



I. 5. Americana. 

 Fruit more than 7.5 mm. in diameter: leaflets with blunt or merely acute 

 blades. 2. 5. sambucifoUa. 



1. SorbuB Americana Marsh. American Mountain Ash. (Man. 

 p. 515 ; I. F. /. 197}.) In low woods or moist ground, Newf. to Man., 

 along the mountains to N. C. and to Mich. — Pennsylvania : Wayne ; 

 Monroe ; Centre ; Huntingdon ; Somerset. 



