A Proposen New Genus or CRUCIFERA. 
Of the family above named there is a considerable group 
of neat and elegant annuals, belonging to the Mexican and 
south Californian coasts and islands, the members of which, 
all of them discovered and brought to the knowledge of 
botanists within the last decade, have been temporarily re- 
ferred to almost as many genera, severally, as there are 
species in the group. The species are six, and in publica- 
tion they have been distributed among the four genera, 
Arabis, Cardamine, Sisymbrium and Nasturtium ; and it isa 
wonder to me that two of them were not consigned to The- 
lypodiwn, rather than to any of the others. To the annual 
species of Cardamine having pinnatisect foliage these plants 
would bear a closer likeness than they do, if they were not 
all conspieuously glaucous; but they show not the faintest 
indication of that sudden and elastic dehiscence of the pods 
which is so essentially characteristic of that genus. Their 
subterete pods and wingless seeds exclude them totally from 
Arabis, to no one section of which, however, do they bear any 
general resemblance. There is only one of the species which 
any one has thought of as possibly referable to Nasturtium. 
There is no rational way of treating such a group but that 
of conceding to it the rank of a genus, and for this one I 
propose the anagrammatie name 
SIBARA. 
Slender, erect, sparingly branching glaucous annuals, 
- with leaves usually pinnately divided into very narrow 
divaricate or retrorse segments. Flowers white or purplish, 
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