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vicinity of Bonn I found Tiifolium incavnatura, Hydrocharis Morsus- 

 Ranae, Iris sibirica, Orchis Morio, Euphorbia platyphylla, Genista 

 germanica, sagittalis and tinctoria, and Carex Ql^deri and Schreberi. 



" As the month of June came in the rocks and walls were covered 

 with various species of Sedum, of which S. album was the most com- 

 mon ; and six or seven species of Campanula came in flower. Near 

 Rheineek I then found Asarum Europseum and Helleborus foetidus ; 

 and near Bonn, Aristolochia Clematitis. The lochs were covered with 

 the white and yellow water-lilies ; while Villarsia nymphaeoides, Sa- 

 gittaria, and other water plants were in great abundance. The spe- 

 cies of Orobanche began to flower in June. Orobanche major I found 

 in almost every wood, being parasitical on the common broom, and 

 particularly abundant up the side of Drachenfels, where it grew on 

 every broom bush. The same was the case at Siegburg. O. minor, 

 parasitical upon Trifolium medium and pratense, is much rarer, though 

 I found it more than once on the Rhine. At Obercassel, in the imme- 

 diate vicinity of Bonn, on a stony bank of the Rhine, grew two other 

 species, O. amethystea of Thuillier, or Eryngii of Duby, and O. Epi- 

 thymura. These are perhaps the two rarest German species. The 

 former, parasitical upon Eryngium campestre, is characterized chiefly 

 by from three to six nerves on the calyx, and a tubular corolla, curved 

 immediately from the base, otherwise straight ; and the latter, a pa- 

 rasite on thyme, has the lowest lip of the corolla twice as large as 

 those at the side, besides curious hairs on the stigma. O. Hederte, 

 parasitical upon ivy, by many of the Germans considered a mere 

 variety of minor, T found in the vicinity. 



" I likewise obtained some intei-esting Orchideae, but am sorry that 

 I did not find Cypripedium Calceolus, having only once met with a 

 withered specimen. At the same place I found Ophrys arachnites and 

 muscifera, together with Herminium Monorchis, Cephalanthera pal- 

 lens, and Orchis militaris. Near Bonn I also found the bug Orchis 

 [Orchis coriophora). At this time I found several very late specimens 

 of Anemone Pulsatilla, Delphinium Consolida (truly wild), Coronilla 

 varia, Sta-chys recta, Sisymbrium Sophia, Arnica raontana, Spergula 

 pentandra', and many others. The banks of the Rhine were for miles 

 covered with Allium Schcenoprasum. A. victoralis 1 found only once. 

 I also found a specimen of Monotropa Hypopitys, but am not in a 

 position to reconcile the disputes respecting its reputed parasitism. 

 I found other plants worthy of notice : Valerianella auricula and Mor- 

 risonii, Polygala depressa, Hippocrepis comosa, and Mespilus ger- 

 manica. 



