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[[lettuce_test]]
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Lettuce. The lettuce plant is botanically Lactuca saliva (which see), which is probably derived from Lactuca Scariola. It is an annual with milky juice, and has been greatly developed for its root-leaves These leaves, much enlarged and modified, comprise the most popular of the plant salads. It has been in cultivation for more than 2,000 years, according to De Candolle. The varieties are many; in 1889, "Annals of Horticulture" listed 119 varieties offered by American dealers. The two general forms are the head lettuces and the cluster or open-leaf lettuces. There are also spring lettuces and summer lettuces, the latter being developed to withstand more heat, for lettuce usually thrives best in the cool weather of spring. Of late years, kinds specially adapted to forcing have been secured, as the growing of the crop under glass has now assumed large proportions.
Lettuce. The lettuce plant is botanically Lactuca saliva (which see), which is probably derived from Lactuca Scariola. It is an annual with milky juice, and has been greatly developed for its root-leaves These leaves, much enlarged and modified, comprise the most popular of the plant salads. It has been in cultivation for more than 2,000 years, according to De Candolle. The varieties are many; in 1889, "Annals of Horticulture" listed 119 varieties offered by American dealers. The two general forms are the head lettuces and the cluster or open-leaf lettuces. There are also spring lettuces and summer lettuces, the latter being developed to withstand more heat, for lettuce usually thrives best in the cool weather of spring. Of late years, kinds specially adapted to forcing have been secured, as the growing of the crop under glass has now assumed large proportions.