. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. Botany. 242 PLATANACEAE. Vol. II. Family 53. PLATANACEAE Lindl. Nat. Syst. Ed. 2, 187. 1836. Plane-tree Family. Large trees, with thin exfoliating bark, alternate petioled palmately lobed and veined leaves, the hollowed petiole bases enclosing the buds for the following season, and very small green monoecious flowers in dense globular heads. Recep- tacle somewhat fleshy. Flow
. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. Botany. 242 PLATANACEAE. Vol. II. Family 53. PLATANACEAE Lindl. Nat. Syst. Ed. 2, 187. 1836. Plane-tree Family. Large trees, with thin exfoliating bark, alternate petioled palmately lobed and veined leaves, the hollowed petiole bases enclosing the buds for the following season, and very small green monoecious flowers in dense globular heads. Recep- tacle somewhat fleshy. Flowers very small, bracted; calyx and corolla appar- ently none. Staminate flowers with ^-8 stamens; filaments short; connective broad, dilated ; anthers oblong or linear, longitudinally dehiscent. Pistillate flowers with 2-9 distinct pistils and several staminodes; ovary linear, i-celled; style elongated; stigma lateral. Ripened head of fruit composed of very numerous narrowly obpyramidal nutlets which are densely pubescent below with long nearly erect hairs. Seed pendulous; endosperm thin; cotyledons linear. The family contains only the following genus, comprising some 8 species, natives of the north her families is doubtful. PLATANUS [Tourn.] L. Sp. PI. 999. [753- Button-ball. Plane-tree. Fig. 221 Characters of the fainily. [Name ancient.] Besides the following species, 2 others occur ir Type species : Platantis orientalis L. I. Platanus occidentalis L. Button-wood. Piataiius occidentalis L. Sp. PI. 999. 1753. A large tree; maximum height about 130° and trunk diameter 14° ; outer bark freely peeling off in thin plates, uncovering the bright while inner layers. Leaves orbicular, or wider than long. 4'-9' wide when mature, cordate or truncate at the base, 3-5-lobed, densely floccose-pubescent with whitish branched hairs when young, less so above and becoming nearly glabrous when . old the lobes mostly large, sharply serrate, or rarely entire; petiole mostly shorter than the bla
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
