102 POMACE^S. 



pressed-globose, mostly somewhat glandular hispid. R f corymbosa Ehrli. 

 R. Pennsylvania Mich. 



Swamps. Can. to Car. W. to Miss. June, July, fy -Slem 36 feet high. 

 Flowers 5 7, in terminal corymbs. Petals large, red, obovate, emarginate. 

 Petioles tomentose. A very variable species. Numerous specimens found on 

 an island near Troy, N. Y., have the stems uniformly and constantly unarmed, 

 except near the root, where there are a few slender prickles. Swamp Rose. 



i. R. blanda Ait.: prickles straight, slender, deciduous; leafets 5 7, 

 oval or oblong, obtuse, equally serrate, pale and mostly pubescent beneath ; 

 stipules dilated ; flowers 1 3, on short smooth peduncles ; lobes of the 

 calyx shorter than the petals ; fruit globose. R. gemeLla Willd. 



Dry hills and rocks. Hudson's Bay to Penn. May, June. ^. Stem 1 3 

 feet high. Flowers rather large, rose-color. Petals obcordate. Distinguished 

 from R. cinnamomea, to which it is allied, by its being more slender and nearly 

 unarmed, by the absence of stipular prickles, the smaller bracts and shorter 

 sepals as compared with the petals. Torr. $ Gr. R. stricta is said not to be a 

 native of the U. S. Early Rose. 



5. R. rubiginosa Linn. : prickles strong, compressed, uncinate, rarely 

 straight ; leafets 5 7, ovate or somewhat rounded, serrate, more or less s 

 especially beneath, glandular and ferriginous ; fruit ovoid or obovate and 

 with the peduncles hispid. R. suaveolens Pursh. 



Hedges and road sides. Throughout the U. S. June, July. pj. Stem tall 

 and slender. Flmixrs solitary or two or three together, pale red. Fruit orange 

 red. Sweet-brier. 



ORDER XL. POMACE^E. APPLEWORTS. 



Calyx adherent, 5-toothed. Petals 5, unguiculate. Stamens 

 numerous. Disk thin, lining the tube of the calyx, bearing the 

 petals and stamens on its margin. Ovaries 1 5, adhering 

 more or less to the sides of the calyx and each other ; styles 

 1 5 ; stigmas simple. Fruit a pome, 1 5 -celled, seldom spu- 

 riously 10-celled. Seeds 1 2 in each carpel ; albumen none. 

 Trees or shrubs, with alternate, simple or compound leaves. 



1. CRAT^EGUS. Linn. Thorn. 



(From the Greek xparos, strength ; in allusion to the strength or firmness of 

 the -wood.) 



Calyx with the tube urceolate, and the limb 5-cleft. Petals 

 5, spreading, orbicular. Stamens many. Styles 1 5, glabrous. 

 Pome fleshy, or baccate, crowned with the teeth of the calyx, 

 containing 1 5 bony 1 -seeded carpels, the summit contracted 

 or closed by the disk. 



* Leaves serrate or subentire, not lobed. 



1. C. Crus-galli Ait. : leaves obovate- wedge form, subsessile, shining, 

 coriaceous, serrate, entire near the base ; corymbs smooth ; segments of" the 



