Eryngium yuccifolium

Eryngium yuccifolium, commonly called rattlesnake-master or button snake-root, is a USA native plant which occurs in rocky woods, prairies and glades and was a common plant of the tallgrass prairie. Most members of the parsley/carrot family (Apiaceae) have finely cut foliage and flowers in domed umbels.
Not so with rattlesnake-master which features basal rosettes of parallel-veined, bristly-edged, sword-shaped, medium green leaves (to 3′ long) resembling those of yucca (lily family) and tiny, stemless, greenish-white flowers tightly packed into globular, 1″ diameter heads resembling thistles (composite family). Flower heads appear in branched clusters at the top of smooth stiff stems typically rising to 3-4′ (less frequently to 5-6′) tall from the centers of the rosettes. Flower heads are subtended by whitish, pointed bracts. The blooms are attractive to butterflies and other insect pollinators.
USES: Native plant gardens, rock gardens, naturalized areas or prairies. Also can be effective in borders.

SPECS: Native Name: XXXX; Genus: Eryngium ; Species: Yuccifolium; Plant Type: Herb; Life Cycle: Perennial; Sun Exposure: Full Sun; Soil Moisture: Mesic (middle), Medium Dry; Height: 4′ — 5′; Spread: 3′; Plant Spacing: 2′; Bloom Time: June — September; Bloom Color: Green, White; Advantages: Low maintenance, Pollinators; USDA Zone: 3 — 8; Attracts: Butterflies; Tolerant: Clay, Drought, Dry soils, Erosion, Rocky soil; Plant Community: Grass-like leaves and flower spikes of blazingstar (Liatris spp) or with sea holly (Eryngium spp).;