Some Observations on the Genus Bubus. 135 



Copenhagen, R. Arrhenii, raised from the seeds of the wild plant, shows 

 some likeness to R. scanieus, and this is still raore the case with plants, in 

 the Botanical Garden at Lnnd, that have been raised from the seeds of the 

 plant cnltivated in Copenhagen. 



It must, in the rnean time, be particularly remembered, that R. scanieus, 

 in Skåne, never shows any intermediate forms in the directum ofR. Arrhenii, 

 but holds itself completely constant, even, when, like its former parent species, 

 growing in woods. In open fruitful fields, where this species is sometimes to be 

 met with, nertainly, it can be somewhat modified, but in such a direction, that 

 separates it still more from R. Arrhenii. For the turiones become somewhat 

 glandulous, more hairy, and more profusely armed with rather unequal priekles, 

 also, the inflorescence becomes more many-flowered, and more Compound, as 

 well as the lower branches more lengthened. 



The absence of all intermediate forms seems to give support to the 

 a--umption. that this species, in uniformity with R. horridus, pallidus, 

 and several forms of R. corylifolius, arose at once. Further more, one 

 must assume that, when R. Arrhenii immigrated here, it did not find the 

 outward circumstances in this place such, as to allow it to remain unaltered. 

 Th'' stronger developement of leaves, and in connection therewith. the dimi- 

 nishing and eontraction of the panicle, can very well seem to be called 

 forth by the same climatic surroundings, that impressed its stamp upon the 

 corylifolians peculiar to our country. This species, also, can be said to recede 

 from R. Arrhenii, in the direction of R. corylifolius, which has probably 

 given origin to the Sprengeliani. I must, however, particularly emphasise 

 that, although R. scanieus has several characteristics in common with R. 

 Arrhenii, it, still, in the whole of its appearance, as well as in the shape of 

 the leaves and in the nature of the inflorescence, is so well distinguished from 

 this species, that it, with the same right, as most of the other forms of this 

 genus, can be considered as a well marked species. 



Qr. r,. Vestitl 



14. R. pyramidalis Kaltenb. Fl. Aach. Beck., pag. 175; Lindeb. Herb. 

 Rub. Suec, n. :;<'>; lt. viUicaulia (Koehl.), var. F. Aresch. Skånes Fl. ed. IL 

 pag. 306. Turiones arcuato-prostrati, aogulati, pilosi, glandulis sessilibus vel 

 rarius breviter stipitatis muniti, versus apieem haud raro aciculis solitariis in- 

 struf-ti, arnleis im^ulis insiileiitibus, sequalibus, e basi dilatata declinatis vel 



Lunds Univ. Årsskrift. T'.m. XXII. 18 



