. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Mirabilis hirsuta (Pursh) MacM. HAIRY FOUR-O'CLOCK Four-OiClock Family (Nyctaginaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: It was ranked G5 S1 on the most recent state hst (Heidel 1997); demonstrably secure globally, but may be critically imperiled in Montana due to extreme rarity. During the 1997 field season, new information was gathered that provided a basis for changing its r
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Mirabilis hirsuta (Pursh) MacM. HAIRY FOUR-O'CLOCK Four-OiClock Family (Nyctaginaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: It was ranked G5 S1 on the most recent state hst (Heidel 1997); demonstrably secure globally, but may be critically imperiled in Montana due to extreme rarity. During the 1997 field season, new information was gathered that provided a basis for changing its rank to SU; status unresolved as vulnerable, no longer tracked as a state species of special concern, moved instead to the watch list. DESCRIPTION: Hairy four-o'clock is a perennial herb from a stout taproot topped by a branched root crown. Stems are usually unbranched and erect, stand 2-12 dm tall, and lower stems are densely-covered by long, multicellular hairs. The opposite leaves lack, or have short (< 5 mm) petioles, and have blades, 2- 12 cm long, which are variable in shape and vestiture, ranging from lance to egg to diamond shaped, and from long to short hairy or rarely nearly hairless. Five lobed, greenish to purplish tinged, calyx-like involucres, 4-10 mm long, are borne terminally and in leaf axils. Each involucre encloses usually three fiowers. The fiowers lack corollas but have pale pink to purplish red, tubular corolla-like calyces, 8-12 mm long, and 3-5 exerted stamens. As fruits mature, the calyces harden around them to form a five ribbed, roughened or tuberculate, olive to brown, densely to sparsely hairy accessory fruit, 4-5 mm long. Flowering in July-early August. Mirabilis hirsuta is distinguished from other Montana species in the genus by having lower stems hairy with long multicellular hairs and leaves which lack or have only short petioles. Mature fruits are desirable for positive identification. GEOGRAPHICAL DISTRIBUTION Global distribution: Wisconsin
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Keywords: ., book, bookcentury1900, bookcollectionamericana, booksubjectbotany
