ROSACEAE 1 25 



ROSA SERRULATA Rafinesque 



This rose, fig. 28. is a shrub with slender arms 1 to 3 feet 

 high, which bear straight, round prickles in pairs below the 

 stipules, and it usually has 5, or sometimes 3 or 7, leaflets per 

 leaf. The leaflets are lance-elliptic or, rarely, oval, glabrous 

 on both sides or slightly pubescent on the veins beneath, and 

 also pale beneath. The margins are sharply, often doubly, ser- 

 rate and the teeth are gland tipped. The flowers are solitary 

 and first open in early i\Iay. The fruit matures in late autumn 

 and reaches a size of about ]4 inch. The seeds are attached at 

 the bottom of the fruit. 



Distribution. — This rose, which grows especially on high 

 land, is distributed from Massachusetts westward to Ontario 

 and Iowa and south to Florida and New Mexico. In Illinois, 

 it is rare and has been taken definitely only in Lawrence County. 

 Perhaps it is, as authorities believe, identical with R. Carolina 

 var. glandulosa (Crepin) Rehder. 



ROSA RUDIUSCULA Greene 



This rose, fig. 29, is an erect shrub generally 2 to 3 feet high, 

 with short and ascending branches. The stems are terete, smooth, 

 and more or less covered with prickles and bristles when young 

 but sparsely so when old. The prickles are round, straight, 

 sometimes curved, slightly reflexed, or on some of the branches 

 not reflexed at all. For the most part, the leaves have 5 to 7 

 leaflets, though rarely 9. The leaflets are subcoriaceous, elliptic, 

 oval, or oblong, and generally % to 1 14 inches long by about 

 1/4 inch wide. They are acute or rounded at the apex and nar- 

 rowed at the base, and the margins are sharply serrate except 

 at the base, there being generally 10 to 15 teeth on each side of 

 the leaf. The blade is glabrous above, paler and pubescent all 

 over the lower surface or only along the midrib, and the midrib 

 is often reddish. The rachis of the leaf is pubescent and often 

 bears a few prickles or bristles and some stalked glands. Lateral 

 leaflets are nearly sessile, but terminal leaflets are seated on 

 stalks nearly 14 inch long. The stipules are lanceolate to oval, 

 and smooth to densely pubescent above and beneath, with mar- 

 gins which are pubescent and entire, or sometimes glandular- 

 dentate. 



