. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Reprinted with permission from the New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada, Vol. 3, page 80, Copyright 1952, The New York Botanical Garden. ASCLEPIAS STENOPHYLLA NARROWLEAF MILKWEED Narrowleaf Milkweed is a perennial herb with few, erect and usually unbranched stems that are decumbent or upright, 2 8 dm high and arise from a thick, woody root. The alternate or opposite leaves are 8-18 cm long, but only 1-5 mm wide
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Reprinted with permission from the New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada, Vol. 3, page 80, Copyright 1952, The New York Botanical Garden. ASCLEPIAS STENOPHYLLA NARROWLEAF MILKWEED Narrowleaf Milkweed is a perennial herb with few, erect and usually unbranched stems that are decumbent or upright, 2 8 dm high and arise from a thick, woody root. The alternate or opposite leaves are 8-18 cm long, but only 1-5 mm wide. Foliage is moderately to sparsely hairy, and the sap is milky. Umbrella-shaped clusters of 10-25 flowers are nearly stemless in the leaf axils on the upper half of the stem. Each greenish-white to yellow flower is only 7-9 mm long and is borne on a hairy stalk that can be up to 1 cm long. Flowers have 5 reflexed corolla lobes which are ca. 5 mm long, and 5 erect hoods that are distinctly 3-lobed at the tip and which surround a central column. Erect spindle-shaped fruits are 9-12 cm long and less than 1 cm wide. Each fruit has numerous seeds, each with a white tail that is ca. 3 cm long. Flowering in June-early July. It resembles narrow-leaved forms of ASCLEPIAS VIRIDIFLORA but has flowers with horns. Both ASCLEPIAS PUMILA and A. VERTICILLATA also have narrow leaves, but often filiform and less than mm wide. A hand lens reveals the three-lobed hoods of A. STENOPHYLLA that are Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Vanderhorst, James P; Cooper, Stephen V; Heidel, Bonnie L; United States. Bureau of Land Management; Montana Natural Heritage Program. Helena, MT : Montana Natural Heritage Program
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