A Field Guide to Pacific States Wildflowers: Washington, by Theodore F. Niehaus

By Theodore F. Niehaus

Книга содержит описания и иллюстрации для 1492 видов из seventy seven семейств - фактически для всех дикорастущих цветов от Британской Колумбии до Калифорнии, от Скалистых гор до тихоокеанского побережья. Каждое видовое описание включает сведения по размерам, местообитаниям, распространению, периоду цветения, обычные и научные названия.
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Root cap; m, meristematic region; fs, fungal sheath or mantle; hn, Hartig net; th, thickened walls of inner cortex; epi, epidermis; oc, outer cortex; ic, inner cortex; end, endodermis (shaded to indicate extent of tannin impregnation); rh, root hair; x, lignified protoxylem; res, collapsed residues of cap cells. From Chilvers and Pryor (1965). ilypt mycorrhizas. Aust. J. Bot. 13, 245-249. 30 late-stage fungi, diversity in fungal species increases greatly (Last et aL, 1984; Dighton et al, 1986).

May be found in woods lacking normal resin ducts such as Cedrus, hemlock, and true firs. Most resins are secreted into special ducts by the layer of parenchyma cells that surround them. The ducts are formed schizogenously (by separation of cells). The ducts are much-branched, so when one of the branches is tapped or wounded, resin flows from the wounded area from long distances. Occasionally resins also are found in cell interiors and cell walls. Resins are not used as reserve foods, and their role in metabolism of woody plants is uncertain.

The thick, spirally borne adult leaves are sickle-shaped. Their petioles are twisted so they hang vertically. Adult leaves lack the heavy waxy coating found on juvenile leaves. In Ilex aquifolium trees, the leaves vary from dentate in the juvenile zone to entire in the adult zone. Trees that show a small and gradual change from the juvenile to adult condition are described as homoblastic; those with an abrupt transition are called heteroblastic. A feature of the New Zealand flora is the large number of heteroblastic species (about 200 species).

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