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P. LEWISI, from North America, is hardly sufficiently distinct from some of the others to warrant special notice. P. MICROPHYLLUS, from New Mexico , is of low growth, and remarkable for its slender branches, small, Myrtle-like leaves, and abundance of small, white flowers. It is a decidedly pretty shrub, but is not so hardy as the others. Japan, 1851.
The group is being studied extensively and every day our knowledge of them is increasing so that we now know quite definitely the life-history of several. Trypanosoma lewisi, a parasite of rats, is perhaps the best known as it is always common where-ever rats are found. Sometimes as many as 30% or 40% of the rats of certain districts are infected.
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