. The botany of crop plants; a text and reference book. Botany, Economic. 632 BOTANY OF CROP PLANTS There are a number of native species of Lactuca in this country. Britton and Brown mention eight species native of the eastern and northern United States, besides the intro- duced L. scariola. This latter species is commonly known as the "compass ;. Fig. 259.—Salsify (Tragopogon porrifolius). From left to right: unopen flower head; side view and face view of open flower head; achene with pappus at tip of beak. Tjrpes of Lettuce.—Four types or botanical varieties of cultivated let
. The botany of crop plants; a text and reference book. Botany, Economic. 632 BOTANY OF CROP PLANTS There are a number of native species of Lactuca in this country. Britton and Brown mention eight species native of the eastern and northern United States, besides the intro- duced L. scariola. This latter species is commonly known as the "compass ;. Fig. 259.—Salsify (Tragopogon porrifolius). From left to right: unopen flower head; side view and face view of open flower head; achene with pappus at tip of beak. Tjrpes of Lettuce.—Four types or botanical varieties of cultivated lettuce are recognized. These may be dis- tinguished by the following artificial key: Key to Types of Lettuce Basal leaves narrow, distinctly lanceolate, L. saliva var. anguslana (asparagus lettuce).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Robbins, Wilfred William, 1884-1952. Philadelphia, P. Blakiston's Son & Co
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
