POMACEAE 173 



3. Ro8a Carolina L. Swamp Rose. (Man. p. 513 ; I. F.y. 7970.) In 

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

 —Pennsylvania : Monroe ; Northampton ; Bucks ; Dei^aware ; 

 Chester ; Lancaster ; Franklin ; Erie. ; Ali^egheny. 



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

 I. F.y". /p//. ) In dry or rocky soil, Me. and Out. to Wis., south to Ga. 

 and La. — Fennsyk'ania : 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 lucida 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. I973-) In waste places, and along roadsides, N. S., N. J. and Pa. 

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

 Bucks ; Schuylkill, Pottsville. 



7. Rosa rubiginosa L. Sweetbrier. (Man. p. 514; I. F. /. 1974.) 

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

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

 Lancaster ; Leb.\non ; 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. 2. Pyrus. 



Flesh of the pome without grit-cells. 

 Cymes simple. 3. Malus. 



Cymes 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. SORBUS 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". sambucifolia. 



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

 p. 515 ; I. F. f. I97S-) In low woods or moist ground, Newf. to Man., 

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

 Monroe ; Centre ; Huntingdon ; Somerset. 



