. 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-0'Clock Family (Nyctaginaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: It was ranked G5 SI on the most recent state list (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
. 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-0'Clock Family (Nyctaginaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: It was ranked G5 SI on the most recent state list (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 fi-om 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 flowers. The flowers 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 fhiit, 4-5 mm long. Flowering in July-early August. Mirabilis hirsuta is distinguished ft-om 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 fi-uits are desirable for positive identification. GEOGRAPHICAL DISTRIBUTION Global distribution: Wiscon
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