240 
Genista tinctoria. 
Trifolium arvense. 
Trifolium agrarium. 
Trifolium repens. 
Daucus Carota. 
Pastinaca sativa. 
Conium maculatum. 
Tussilago Farfara. 
Inula Helenium. 
Gnaphalium uliginosum. 
Anthemis Cotula. 
Achillea Millefolium. 
Tanacetum vulgare. 
Leucanthemum vulgare. 
Cirsium arvense. 
Cirsium lanceolatum. 
Lappa officinalis. 
Cichorium Intybus. 
Leontodon autumnale. 
Taraxacum Dens-leonis. 
Plantago major. 
Plantago lanceolata. 
Anagallis arvensis. 
Verbascum Thapsus. 
Verbascum Blattaria. 
Linaria vulgaris. 
ESSAYS. 
Mentha viridis. 
Mentha piperita. 
Calamintha Nepeta. 
Calamintha Clinopodium. 
Nepeta Cataria. 
Nepeta Glechoma. 
Marrubium vulgare. 
Galeopsis Tetrahit. 
Leonurus Cardiaca. 
Lamium amplexicaule. 
Echium vulgare. 
Symphytum officinale. 
Echinospermum Lap- 
pula. 
Cynoglossum officinale. © 
Solanum nigrum. 
Chenopodium album. 
Chenopodium hybri- 
dum. 
Chenopodium Botrys. 
Polygonum aviculare. 
Polygonum Convolvyu- 
lus. 
Rumex crispus. 
Rumex sanguineus, 
Rumex Acetosella. 
Allium vineale. 
Alopecurus pratensis. 
Phleum pratense. 
Agrostis vulgaris. 
Agrostis alba. 
Dactylis glomerata. 
Poa annua. 
Poa compressa. 
Poa pratensis. 
Poa trivialis. 
Eragrostis pooides. 
Festuca ovina. 
Festuca pratensis. 
Bromus secalinus. 
Lolium perenne. 
Triticum repens. 
Triticum caninum. 
Anthoxanthum odora- 
tum. 
Panicum glabrum. 
Panicum sanguinale, 
Panicum Crus-galli. 
Setaria glauca. 
Setaria virdis. 
The plants of this list, regarded as weeds, are of very vari- 
ous character; and several of them, such as White Clover 
and most of the Grasses, where most dominant, do not fall 
under the ordinary definition of weeds at all, but under that 
of plants useful to the farmer. Some, like Purslane, are only 
garden weeds ; some belong to pastures and meadows; others 
affect roadsides. The fewness of European corn-weeds is 
remarkable. Ches and Corn-cockle (Lychnis Githago) are 
the only ones on the list. Corn Poppy, Bluebottle and Knap- 
weed (Centaurea Cyanus and C. nigra) and Larkspur are 
conspicuously wanting; but the last two are not wholly un- 
known in some parts of the country. 
But the only question before us is, whether these plants in- 
troduced from Europe are or are not self-fertilized, or more 
habitually so than others, so that this may be accounted an 
