# Whorled Milkweed (*asclepias verticillata*) Whorled Milkweed (Asclepias verticillata) is an elegant, slender perennial wildflower native to eastern and central North America. Unlike its broader-leafed milkweed relatives, this species features thin, needle-like leaves arranged in delicate whorls around a single, erect stem. It stands out in late summer with its clusters of small, fragrant white-to-greenish-white flowers. This plant plays a vital ecological role, acting as a crucial host plant for monarch caterpillars and a magnet for various native pollinators, while also producing a toxic sap that deters generalist herbivores. - **Category:** [Plants](https://www.snappit.app/explore/categories/plant) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 3 - **Habitat:** Found in dry, open woodlands, prairies, pastures, and along roadsides, often thriving in poor, sandy, or rocky soils. ![Whorled Milkweed](https://inaturalist-open-data.s3.amazonaws.com/photos/20862724/medium.jpg) Photo: aarongunnar, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/20862724) ## Appearance This herbaceous perennial typically grows to a height of 30 to 90 cm, with narrow, linear leaves measuring 5 to 8 cm long that grow in whorls of 3 to 6 around the stem. In mid-to-late summer, small flat-topped clusters of star-shaped, greenish-white to cream-colored flowers bloom from the upper leaf axils. Each individual flower is roughly 6 mm wide, exhibiting five reflexed petals and a central crown. Following pollination, it produces slender, upright seed pods that dry and split to release fluffy, wind-dispersed seeds. ## Taxonomy - **Kingdom:** Plantae - **Phylum:** Tracheophyta - **Class:** Magnoliopsida - **Order:** Gentianales - **Family:** Apocynaceae - **Genus:** Asclepias ## Interesting facts - It is one of the latest-blooming milkweeds, making it an essential late-season nectar source for migrating Monarch butterflies and native bees. - The seeds have silky hairs called floss, which during World War II were collected by school children to stuff military life jackets when traditional materials were scarce. - Whorled Milkweed is one of the most toxic milkweed species to livestock, particularly sheep and horses, earning it a reputation as a rangeland weed. ## Special abilities - **Cardiac Glycoside Synthesis:** Produces toxic cardenolides in its milky sap, which deter herbivores and are sequestered by monarch larvae for their own defense. - **Drought-Resilient Taproot:** Utilizes a deep, fibrous root system to access deep water reserves, helping it survive intense droughts and wildfires. - **Aerodynamic Seed Propagation:** Equips its seeds with fine, silky hairs that catch wind currents, allowing them to disperse over long distances to colonize new open sites. ## Measurements & details - **Length:** 30-90 cm - **Lifespan:** 3-10 years ## Diet & Feeding As a photosynthetic plant, Whorled Milkweed synthesizes its own organic compounds using sunlight, water, carbon dioxide, and mineral nutrients from the soil. - **Primary Foods:** Sunlight, Water, Carbon Dioxide, Soil Minerals ## Ecological connections - **Eaten by:** [Monarch Butterfly](https://www.snappit.app/explore/monarch-butterfly) (*Danaus plexippus*) — Larvae feed exclusively on the foliage of milkweeds, gaining chemical protection from predators. - **Mutualism:** Honey Bee (*Apis mellifera*) — Adult bees visit the flowers for nectar, successfully pollinating the plant in the process. ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Whorled Milkweed? Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details. ### How long is Whorled Milkweed? 30-90 cm ### How long does Whorled Milkweed live? 3-10 years ### What does Whorled Milkweed eat? As a photosynthetic plant, Whorled Milkweed synthesizes its own organic compounds using sunlight, water, carbon dioxide, and mineral nutrients from the soil. ### Where is Whorled Milkweed usually found? Found in dry, open woodlands, prairies, pastures, and along roadsides, often thriving in poor, sandy, or rocky soils. ## Where to spot - [Calico Rock Historic District](https://www.snappit.app/guides/places/calico-rock-historic-district) — Arkansas, US · Historic District - [Lyndon B. Johnson National Grassland](https://www.snappit.app/guides/places/lyndon-b-johnson-national-grassland) — Texas, US · National Park - [Shaw Nature Reserve](https://www.snappit.app/guides/places/shaw-nature-reserve) — Missouri, US · Botanical Garden - [Knox County Courthouse](https://www.snappit.app/guides/places/knox-county-courthouse) — Nebraska, US · Historic Site - [Soldiers Delight Natural Environment Area](https://www.snappit.app/guides/places/soldiers-delight-natural-environment-area) — Maryland, US · Nature Reserve [View all places to see Whorled Milkweed](https://www.snappit.app/guides/where-to-see/whorled-milkweed) ## More Plants - [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*) - [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*) - [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*) - [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*) --- Source: [Whorled Milkweed: Facts & Places to See — Snappit](https://www.snappit.app/explore/whorled-milkweed)