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Coming now to particular instances, we may turn our attention in the first place to the genus Sisymbrium. Two species are reputed to have bracts, Sisymbrium hirsutum and S. supinum. Each flower-stalk of their long racemes is situated in the aril of such a bract, and the peculiarity is quite a natural one, corresponding exactly to what is seen in the inflorescence of other families.
Rhododendron intermedium is an intermediate form between the hairy and the rusty species from the Swiss Alps, R. hirsutum and R. ferrugineum, the former growing on chalky, and the other on silicious soils.
Two cases of sudden mutations have come to my knowledge, producing this same anomaly in allied species. One has been already alluded to; it pertains to the common evening-primrose or Oenothera biennis, and one is a species belonging to another genus of the same family, the great hairy willow-herb or Epilobium hirsutum.
But it does not appear that the antisiphylitic powers of Lobelia have been confirmed by any instances of European practice. Woodville's Med. Bot. p. 251. LYTHRUM Salicaria. WILLOW HERB. The Herb. D. This is used internally in dropsies, obstinate gleets, and leucorrhoea. Similar Plants. Epilobium palustre; Epilob. angustifolium; Epilob. hirsutum. MALVA sylvestris. COMMON MALLOW. Herb.
Intermediates are often found in hybrid cultures, and in them the character is a very variable one, but as yet they were not met with in progeny of this mutant. All these plants were exactly like O. biennis, with the single exception of their petals. Epilobium hirsutum cruciatum was discovered by John Rasor near Woolpit, Bury St. Edmunds, in England.
R. HIRSUTUM. Alpine Rose. South Europe, 1656. Very near R. ferrugincum, but having ciliated leaves, with glands on both sides. R. hallense and R. hirsutiforme are intermediate forms of a natural cross between R. hirsutum and R. ferrugincum. They are handsome, small-growing, brightly flowered plants, and worthy of culture. R. INDICUM. Indian Azalea.
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