Overview

Comprehensive Description

Description

This perennial wildflower is 1-2' tall, consisting of a cluster of unbranched flowering stems that are ascending to erect. The stems are light green to purplish green, terete, and nearly glabrous; the upper halves of the stems are often sparsely short-pubescent in lines underneath the petioles of the leaves. Pairs of leaves occur at fairly frequent intervals along the stems; both the leaves and stems contain a milky latex. These leaves are 2-5" long and ¼-1½" across; they are narrowly elliptic to ovate-elliptic in shape and smooth along their margins. Leaf tips taper gradually to acute points, while leaf bases are wedge-shaped. Leaf venation is pinnate with a prominent midvein and curving lateral veins. The upper leaf surface is medium to dark green, while the lower leaf surface is light to medium green; both surfaces are glabrous or nearly so (sometimes sparse fine hairs may occur along the lower sides of the central veins). The narrow petioles are ¼-¾" in length; they are light green to purplish green and grooved along their upper sides. One or more umbels of flowers about 1½-2½" across are produced from the axils of the upper leaves; each umbel has 20-50 white to pinkish white flowers. The umbels are held more or less erect on rather stout peduncles about ½-2" long. Each flower is about ¼" across, consisting of 5 corolla lobes (or petals), 5 sepals, 5 hoods with horns, and a central reproductive column (gynostegium). The reflexed corolla lobes are generally white, although they are often pinkish along the undersides towards their tips. The white hoods are erect and scoop-shaped; the horns of these hoods are slender, curved slightly inward, and exerted. The inconspicuous sepals are pale green or pale purplish green, lanceolate-oblong in shape, and shorter than the corolla lobes. The pedicels are ¾-1¼" long, whitish green to pale purplish green, terete, and minutely pubescent. The blooming period occurs from late spring to mid-summer (or sometimes later), lasting about 1-2 months. The flowers are mildly fragrant. Afterwards, fertile flowers are replaced by lanceoloid seedpods (follicles) about 2½-3" long. The outer surfaces of these seedpods are smooth and glabrous. Immature seedpods are held erect, but they droop downward at maturity to release their seeds. These seeds have expanded coats, but they lack comas (tufts of hair); they are capable of floating on water for extended periods of time, thereby distributing them to new locations (Edwards et al., 1994). The root system consists of a woody crown. Decumbent stems on moist ground can develop rootlets, forming clonal offsets.
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Source: Illinois Wildflowers

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Distribution

Range and Habitat in Illinois

The native White Swamp Milkweed (Asclepias perennis) is occasional in southern Illinois, while in the rest of the state it is absent (see Distribution Map). Illinois lies along the northern range limit of this species. Habitats include floodplain and bottomland woodlands, swamps (including Bald Cypress swamps), borders of ponds and streams in shady areas, and ditches. This milkweed is usually found in higher quality wetlands that are semi-shaded to shaded.
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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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SW Guangxi, S Yunnan [India, Laos, Malaysia, Myanmar, Nepal, Sikkim, Thailand].
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Himalaya (Nepal, Sikkim), Burma, Thailand, W. China.
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Physical Description

Morphology

Elevation Range

800-1400 m
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Description

Stems to 8 m, terete, glabrous. Petiole 4-12 cm, with apical adaxial gland cluster; leaf blade ovate, 6-20 × 4-15 cm, sparsely appressed pubescent to glabrous, base deeply cordate, apex acute-acuminate; lateral veins 6 or 7 pairs. Peduncle 3.7-13 cm. Pedicel 1.2-4 cm. Sepals ovate-oblong, 3-4 mm, ciliate. Corolla yellowish white; tube 1.2-1.8 cm, limb 3-4 cm in diam.; lobes shorter than tube, oblong, glabrous. Corona lobes white, 1-1.2 cm. Ovaries glabrous. Follicles ca. 16 × 4 cm. Seeds ovate; coma to 4 cm. Fl. Jun-Aug, fr. Sep-Dec.
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Diagnostic Description

Synonym

Asclepias pulchella Roxburgh, Fl. Ind. 2: 54. 1824.
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Type Information

Isoneotype for Asclepias perennis Walter
Catalog Number: US 1837067
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: ; Status verified from secondary sources
Preparation: Pressed specimen
Collector(s): R. K. Godfrey & R. M. Tryon
Year Collected: 1939
Locality: Swamp forest, Palmer Bridges, 5 miles east southeast of Honeyhill., Berkeley, South Carolina, United States, North America
  • Isoneotype: Walter, T. Fl. Caroliniana. 107.; Ward, D. B. 2007. J. Bot. Res. Inst. Texas. 1 (2): 1097.
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Ecology

Habitat

Range and Habitat in Illinois

The native White Swamp Milkweed (Asclepias perennis) is occasional in southern Illinois, while in the rest of the state it is absent (see Distribution Map). Illinois lies along the northern range limit of this species. Habitats include floodplain and bottomland woodlands, swamps (including Bald Cypress swamps), borders of ponds and streams in shady areas, and ditches. This milkweed is usually found in higher quality wetlands that are semi-shaded to shaded.
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Source: Illinois Wildflowers

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Open woods, forests, bushland; 400-1200 m.
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Associations

Faunal Associations

Little is known specifically about the floral-faunal relationships of White Swamp Milkweed (Asclepias perennis). The white flowers are probably cross-pollinated by various bees, wasps, butterflies, and moths. The floral reward of such visitors is nectar. Other insects feed on the foliage, seeds, roots, plant juices, and other parts of milkweeds. These insect feeders include stem- and root-boring larvae of Tetraopes tetrophthalmus (Red Milkweed Beetle), stem-boring larvae of the weevil Rhyssomatus lineaticollis, Labidomera clivicollis (Swamp Milkweed Beetle), Lygus kalmii (Small Milkweed Bug) and Oncopeltus fasciatus (Large Milkweed Bug), several aphid species, caterpillars of the butterfly Danaus plexippus (Monarch), and caterpillars of a few moths (see the Insect Table for a more complete listing of these species). Because the milky latex of the foliage is bitter-tasting and toxic, White Swamp Milkweed and other milkweeds are rarely eaten by mammalian herbivores. However, the seeds are a minor source of food to the White-Footed Mouse (Whitaker, 1966).
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Flower-Visiting Insects of White Swamp Milkweed in Illinois

Asclepias perennis (White Swamp Milkweed)
(the butterfly sucks nectar; this observation is from Fothergill & Vaughn)

Butterflies
Nymphalidae: Phyciodes tharos sn (FV)

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Relevance to Humans and Ecosystems

Benefits

Cultivation

The preference is partial sun to medium shade, wet to consistently moist conditions, and soil containing abundant organic matter. Standing water is tolerated if it is temporary.
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