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Apiaceae
Oxypolis

not marked as a favorite taxon Oxypolis rigidior (Linnaeus) Rafinesque. Common name: Cowbane, Pig-potato. Phenology: Aug-Oct; Oct-Nov. Habitat: Bogs, seepages, swamps, wet meadows, streambanks. Distribution: NY west to MN and south to n. FL and TX.

Glossary (beta!)

ID notes: Very variable in the size, shape, and toothing/lobing of the leaflets.

Origin/Endemic status: Native

Synonymy ⓘ: = Ar, C, Can, Fl7, FNA13, G, GW2, K4, MC, Mi, Mo2, NcTx, NY, Ok, Pa, RAB, Tat, Tn, Tx, Va, W, WH3; > Oxypolis longifolia (Pursh) Small — S13; > Oxypolis rigidior (L.) Raf. — S, S13; > Oxypolis rigidior (L.) Raf. var. ambigua (Nutt.) Rob. — F, Il, WV; > Oxypolis rigidior (L.) Raf. var. rigidior — F, Il, WV; > Oxypolis turgida Small — S; Sium rigidius Linnaeus. Basionym: Sium rigidius L. 1753

Links to other floras: = Oxypolis rigidior - FNA13

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL
  • Eastern Mountains and Piedmont: OBL
  • Great Plains: OBL
  • Midwest: OBL
  • Northcentral & Northeast: OBL

Heliophily ⓘ: 6

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image #1 of Oxypolis rigidior© Bruce Sorrie
image #2 of Oxypolis rigidior© Joey Shaw source | Original Image ⭷
image #3 of Oxypolis rigidior© Kyle Filicky | Original Image ⭷
image #4 of Oxypolis rigidior© Sonnia Hill | Original Image ⭷
image #5 of Oxypolis rigidior© Scott Ward, some rights reserved (CC BY), uploaded by Scott Ward source CC-BY | Original Image ⭷
image #6 of Oxypolis rigidior© Alan M. Cressler | Original Image ⭷
image #7 of Oxypolis rigidior© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #8 of Oxypolis rigidior© Keith Bradley | Original Image ⭷
image #9 of Oxypolis rigidior© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #10 of Oxypolis rigidior© Kyle Filicky | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect perennial of bogs, seepages, swamps, wet meadows and stream banks.

Stems: Stems stout or slender, few-branched, smooth.

Leaves: Leaves alternate and on long petioles (reduced upward) with sheathing bases, up to 12 in. long, once pinnately divided into 5-11 oblong to lance-shaped segments with netted veins and widely spaced teeth toward the tip, smooth.

Inforescence:

Flowers: Flowers in flat-topped, compound umbel (3-5 in. wide) at top of stem, with a few smaller umbels from upper leaf axils; white; 1/8 in. wide; consisting of 5 upcurved to spreading petals, 5 stamens with white anthers and an ovary with pistil.

Fruits: Fruit a joined pair of oval, ridged seeds that are flat on one side.

Comments: Poisonous to livestock.

Height: 2-5 ft.

plant sale text:

bloom table text:

description: Erect perennial of bogs, seepages, swamps, wet meadows and stream banks.

stems: Stems stout or slender, few-branched, smooth.

leaves: Leaves alternate and on long petioles (reduced upward) with sheathing bases, up to 12 in. long, once pinnately divided into 5-11 oblong to lance-shaped segments with netted veins and widely spaced teeth toward the tip, smooth.

inflorescence:

flowers: Flowers in flat-topped, compound umbel (3-5 in. wide) at top of stem, with a few smaller umbels from upper leaf axils; white; 1/8 in. wide; consisting of 5 upcurved to spreading petals, 5 stamens with white anthers and an ovary with pistil.

fruits: Fruit a joined pair of oval, ridged seeds that are flat on one side.

comments: Poisonous to livestock.

cultural notes:

germination code:

native range: eastern North America



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