Eryngium yuccifolium Michaux var. yuccifolium . Northern Rattlesnake-master. Phen: Jun-Aug. Hab: Diabase barrens and glades, olivine barrens, pine savannas, pine flatwoods over loamy or clay soils, wet to dry prairies, other open sites with at least periodic moisture, generally in sites showing some prairie affinities. Dist: Widespread in southeastern and midwestern North America, the exact range limits of the typic variety and var. synchaetum somewhat obscure; probably distributed from NJ, OH, s. MI, WI, MN, and NE south to Panhandle FL, AL, MS, n. LA, and e. TX.

Origin/Endemic status: Native

Synonymy ⓘ: = K1, K3, K4, MC, NE, RAB, Tx, Va, Bell (1963); = Eryngium aquaticum L. – S, misapplied; = n/a – Tat; < Eryngium yuccifolium Michx. – Ar, C, F, Fl7, G, GrPl, GW2, Il, Mi, Mo2, NcTx, Ok, Tn, W, WH3

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FAC (name change)
• Great Plains: FACW (taxonomic split from wetland indicator species)
• Midwest: FAC (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FAC (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8