. Practical botany. Botany. ECOLOGICAL GROUPS 489 Make a list of all the aquatic seed plants that j'ou know, of some of the principal marsh plants, of several herbaceous and several woody mesophytes, of all the xerophytes you know, — the xerophytes arranged somewhat in the order of their capacity to resist drought conditions. 447. Ecological groups based on light relations. Plants which prepare their food by photosynthesis evidently need. Fig. 367. Spanish moss (TiUandsia) growing on branches of a tree Much reduced. Photograph by S. M. Tracy Fig. 368. Tufts of Spanish moss, with leaves of the
. Practical botany. Botany. ECOLOGICAL GROUPS 489 Make a list of all the aquatic seed plants that j'ou know, of some of the principal marsh plants, of several herbaceous and several woody mesophytes, of all the xerophytes you know, — the xerophytes arranged somewhat in the order of their capacity to resist drought conditions. 447. Ecological groups based on light relations. Plants which prepare their food by photosynthesis evidently need. Fig. 367. Spanish moss (TiUandsia) growing on branches of a tree Much reduced. Photograph by S. M. Tracy Fig. 368. Tufts of Spanish moss, with leaves of the magnolia on which it grew Reduced. Photograph by Florida Agri- cultural Experiment Station light as much as they do air or water; but there is great diversity in their demands as regards intensity of light. The practical forester soon becomes familiar with this fact, and the gardener and floriculturist know that while some plants, such as tulips, poppies, verbenas, and most composites, need all the sun they can get, other plants, as most ferns, lilies of the valley, spiderworts, many violets, many genera of the Pars- ley family and the Heath family, grow best in partial 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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