. A text-book of botany for secondary schools. Botany. DICOTYLEDONS: ARCHICHLAMYDB^ 283. dicecious (§ 137) and wind-pollinated. A very character- istic flower-cluster occurs in many of these forms, being a spike-like cluster, but having conspicuous scales or bracts subtending individual flowers or small groups of flowers. It is called the ametit or catkin; and familiar illus- trations are found on willows (Fig. 278), cottonwoods, birches, and alders (Fig. 279). Both staminate and pis- tillate flowers, or only one kind, may be in aments. In higher fami- lies with more con- spicuous and usual- l
. A text-book of botany for secondary schools. Botany. DICOTYLEDONS: ARCHICHLAMYDB^ 283. dicecious (§ 137) and wind-pollinated. A very character- istic flower-cluster occurs in many of these forms, being a spike-like cluster, but having conspicuous scales or bracts subtending individual flowers or small groups of flowers. It is called the ametit or catkin; and familiar illus- trations are found on willows (Fig. 278), cottonwoods, birches, and alders (Fig. 279). Both staminate and pis- tillate flowers, or only one kind, may be in aments. In higher fami- lies with more con- spicuous and usual- ly insect-pollinated flowers, other common trees occur, as the tulip-tree (white poplar), magnolia, lin- den, maple, buckeye, box-elder, locust, sweet- gum, and tupelo (black- gum); and among the Sympetalse the ash be- longs. The very names of these trees suggest the characteristic forms of our great deciduous forest, which once ex- FiG. 279.—Catkins of alder; A. branch with tended in almost Un- staminate (n) and pistillate (m) catkins; broken SWeep frOm the B, pistillate catkin in the next year (when , . i * xi the seeds are ripe).—After Warming. prairieS tO the Atlantic Fig. 278. -Catkins of willow: A, staminate; /?, pis- 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
Size: 1732px × 1442px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
