Isotria medeoloides

Common Names

Small Whorled Pogonia

Summary

Isotria medeoloides is a North American native terrestrial orchid in the Orchidaceae, a small herb 20–25 cm tall with a stout upright stem and a whorl of four to six pale gray-green leaves, one or two greenish-yellow flowers about 2 cm long arising from the center of the leaf whorl; flowers are greenish with a green-streaked yellow lip, lack nectar guides and fragrance, and insect pollination has not been observed, suggesting self-pollination, the plant is rhizomatous and can remain dormant for one to three years, with very tiny dust-like seeds that can persist in soil for decades, fruits mature in late summer, it grows in hardwood and conifer-hardwood forests typically in leaf litter on acidic soils with an open herb layer and canopy gaps, and its range extends from southern Maine to Georgia and west to southern Ontario, Michigan, and Tennessee, conservation and cultivation considerations emphasize reliance on seed-based reproduction, which is essential for populations but difficult, and limited propagation in cultivation, seeds are very small and dust-like, with potential long-lived seed banks; survival depends on mycorrhizal associations with fungi related to Russula and Lactarius, linked to deciduous forest trees like oaks, beeches, and hickories, management can include canopy thinning to increase light, which has been shown to raise flowering and plant numbers in some sites, with canopy openness increasing by about 35% in one study, the species is federally listed as Threatened in the United States, globally ranked G2, and occurs in scattered second-growth to mature forests with leaf litter on acidic soils; primary threats include habitat destruction and collection, and conservation focuses on inventory, monitoring, and protection of remaining populations on public lands, research on demography and mycorrhizal links, and preventing wild-harvest.

Lifecycle

Perennial

Height

8-10 inches

Sunlight Requirements

Ideally partial sun.

Soil Type

Acidic soil

Soil Drainage

Well-drained soils with lateral water movement on acidic soils

Soil pH

Acidic soils (low pH)

Bloom Color

Yellowish green

Bloom Time

Spring

Foliage Color

Grayish-green

Fall Foliage Color

Gray-green

Leaf Lifecycle

Deciduous

Growth Rate

Very slowly; 7–8 years between flowering events.

Seasons of Interest

Spring and Summer

Propagation Methods

Seeds; no evidence of spores, cuttings, division, or layering

Attracts Wildlife

No wildlife attracted