. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Quercus macrocarpa Michaux BUR OAK Oak Family (Fagaceae) CONSERVATION STATUS Fish and Wildlife Service: None Bureau of Land Management: Sensitive Montana Natural Heritage Program: G5 S1; demonstrably secure globally, but may be critically imperiled in Montana where it is extremely rare. DESCRIPTION: Bur oak is a small to large tree. Its bark is deeply furrowed and twigs are stout. The alternate, oblong-elliptic leaves, to 20 cm (8 in) long, are deeply to shallow
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Quercus macrocarpa Michaux BUR OAK Oak Family (Fagaceae) CONSERVATION STATUS Fish and Wildlife Service: None Bureau of Land Management: Sensitive Montana Natural Heritage Program: G5 S1; demonstrably secure globally, but may be critically imperiled in Montana where it is extremely rare. DESCRIPTION: Bur oak is a small to large tree. Its bark is deeply furrowed and twigs are stout. The alternate, oblong-elliptic leaves, to 20 cm (8 in) long, are deeply to shallowly lobed with the terminal lobe the largest. They are dark green above, but silvery below with fine, star-shaped hairs. Male fiowers of 5- 10 stamens are borne in long, loose, pendulous inflorescences from the leaf axils. 1 -several female flowers occur in the axils of new leaves. The acorn is 2-4 cm long, ellipsoidal, and the bottom half or more of the acorn is enclosed by a roughened, fringe-margined cup. Acorns mature in one year, often persisting. This is Montanais only native oak. GEOGRAPHICAL DISTRIBUTION Global distribution: Eastern temperate North America, from New Brunswick to Saskatchewan, south to Maryland, Arkansas and Texas (Great Plains Flora Association 1986). This stand is contiguous with Black Hills oak, and is upstream on the Little Missouri River from stands on escarpments and coulee systems that may reflect its relict origin. Quercus macrocarpa Bur Oak Montana distribution: Carter County. The single stand in Montana straddles he state lines and extends into adjoining Crook County, Wyoming. Carter County distribution: The species in Montana spans over 1,000 acres, but only a fraction of this area has an oak-dominated plant association, and there are only an estimated 12 acres of oak-dominated plant association on local BLM-administered lands (Heidel 1993). Most of the oak stand is on private or state ownership, and many of the oak trees intersperse with other
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Keywords: ., bhlc, bookcentury1900, bookcollectionamericana, booksubjectbotany
