Waterspider Bog Orchid

Habenaria repens is remarkable in sometimes being truly aquatic. Often forming floating mats, the plants then are commonly decumbent, at least basally, and new shoots and slender roots arise abundantly from much of the length of the stem. A few spheroid tuberoids are sometimes produced from roots arising at wide intervals. Other roots bear new shoots some decimeters from the parent stem; the distal portion of the root then commonly enlarges into a slenderly lance-fusiform tuberoid.

Plants terrestrial or semiaquatic, erect to decumbent, 10–90 cm. Leaves scattered along stem and gradually reduced to sheathing bracts; blade ascending, linear-lanceolate to lanceolate, narrowly elliptic, or oblanceolate, 3–25 × 1–4.5 cm. Inflorescences: floral bracts spreading to ascending, lanceolate, 15–90 × 5–12 mm. Flowers ascending, not showy; sepals 3–7 × 3–4 mm; dorsal sepal shallowly concave; lateral sepals reflexed-spreading; petals greenish, lamina ascending, falcate, 3–7 × 1 mm, lateral lobe arcuately spreading-ascending, filiform, slightly to markedly exceeding petal; lip greenish, middle lobe descending, linear, 4–7 × 1 mm, lateral lobes ascending-spreading, filiform, 5–11 mm; spur slenderly cylindric to scarcely club-shaped, 0.8–1.4 cm; ovaries 9–15 mm. Capsules on short pedicel, nearly erect, 8–15 × 3–7 mm.

Ala., Ark., Fla., Ga., La., Miss., N.C., Okla., S.C., Tex.; Mexico; West Indies; Central America; South America.

Flowering primarily summer--fall, sporadically (Apr--Dec).

Marshes, wet meadows, bogs, margins of streams, ditches, and ponds; commonly an emergent aquatic in shallow water and in floating mats alone or with other vegetation; 0--100m.

Habenaria nuttallii Small

Habenaria repens, commonly called the water-spider bog orchid or the floating orchid, is an orchid species widespread across Latin America from Mexico and the West Indies south to Argentina, as well as in the Southeastern United States from Texas and Oklahoma east to Florida and the Carolinas plus an isolated population in Virginia.

A phenolic compound called habenariol can be found in H. repens. It acts as a feeding deterrent.