73 



station ou the way to Carlsruhe, where I met Professor Doll, and we 

 proceeded to investigate the productions of the long sandy tract 

 which occupies a middle space between the hills of the Odenwald 

 and the Rhine. We passed through Oftersheim and Schwetzingen, 

 and hunted in vain for the Corispermum Marschalii. I think we 

 found nothing which I had not already observed, except the Fungi, 

 which were very numerous. Serratula Pollichii still offered tolerable 

 specimens, but Pyrola umbellata was quite out of flower. The richest 

 part of the tract seems to me between Friedrichsfeld and Mannheim, 

 on the south side of the railway. The next day I got the Trapa, 

 near Mannheim, in a piece of water, which was, perhaps, once, part 

 of the bed of the Neckar, near the road from Mannheim to Secken- 

 heim, but I found neither flower nor fruit. Afterwards I hunted in 

 the Neckarau Wald, a woody tract near the Rhine, above Mannheim, 

 but there was too much water to permit a successful search for the 

 Salvinia, which was my principal object. Stenactis annua has much 

 the appearance of having been sown, I know not why, on the bank 

 which separates the waters of the Rhine from the marshy land within. 

 In descending the Rhine, I determined to have one day more at 

 Kreuznach. Aster Amelias, Chrysocoma Linosyris, Peucedanum alsa- 

 ticum, and Stipa capillata, were my best things. After that I again 

 had a little walk at Liege : Carduus acanthoides here approaches to 

 the English form. In Austria the heads appear to be always solitary. 

 On the Rhine they are generally so, while about Liege they are, per- 

 haps, full as often clustered. C. crisp us I did not see at Liege, but 

 on the Rhine the heads are usually, but not always, two or three toge- 

 ther. The three points of difference marked out by Koch are, the 

 solitary heads of C. acanthoides, its somewhat more divided and 

 more thorny leaves, and the web-like hairs which cover the under 

 surface of the leaves in C. crispus, but which are said never to be 

 found in C. acanthoides. On returning to Lewes, I find plants both 

 with and without covering to the underside of the leaves, but the 

 plants were too far decayed to permit me to determine whether it was 

 possible to make out the two species of Koch. The plant which I 

 got last year at Paris is not the German C. acanthoides, but a hybrid 

 between C. nutans and C. crispus or acanthoides. 



Joseph Woods. 



Lewes, January, 1845. 



Vol. II. 



