ON THE GENUS RUBUS. 498 
rous small acini. If it should be deficient in some of the latter 
characters, the student must place it among these doubtful inter- 
mediate species which I am afraid he must unavoidably admit 
into his collection while studying this intricate genus. His se- 
cond observation may be directed to the calyx of the fruit, reflected 
or closing on the acini. If the first be the case, he may find it 
expedient again to refer to the panicle, always branched, but the 
flowers in some cases united into knots, while im others the ulti- 
mate stalks are almost always long and slender. I know however 
but two species exhibiting this character,—A. tomentosus and R. 
fruticosus of ‘Rubi Germanici,’—and I have no evidence that 
either of these have been found in Britain. The more common 
arrangement is that where they are united into knots, more or less 
perfectly developed, and sometimes compound. We find some- 
times a taper raceme or a panicle ending in such a raceme; and 
i figures or in the specimens of a herbarium this may seem a 
valuable character, but I suspect it to vary even in the individual. 
Having disposed of these the student will proceed to divide 
his remaining plants of this section into four groups. The first, 
marked by having quinate leaves, with the outer leafits sessile, 
and all of them broad at the base and consequently overlapping. 
The second, by five, in some degree separated, leafits, and by 
nearly equal prickles. ‘The third, by similar leafits and prickles 
passing into aciculi and setee ; and the fourth by having usually 
only three leafits. 
Thus, then, we find the plants of this part of the genus Rudus 
divided into seven groups.— 
Raceme nearly simple, short and abrupt, forming. . . . Group 1 
Panicle branched. 
Calyx of fruit reflected. 
Flowers not collected into knots. Stalks long and slender . 2 
Flowers collected into knots. 
Leafits 5. 
Outer leafits sessile; all broad at the base . . . . . 8 
Leafits separate, all stalked. 
Prickles nearly equal: -jy...hnnse Aad west) xcbpeee? honed 
Prickles passing into aciculi and ate at Nachbs nine 
[LAC EAEIES ORE ORY, IRN PS Seas Cnn na a) 
Calva MMICACUNO MORE D er ey ct oly By ity teu ak eal 
The student will however often meet with plants which he 
