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FNA | Family List | FNA Vol. 26 | Orchidaceae | Platanthera

3. Platanthera hookeri (Torrey ex A. Gray) Lindley, Gen. Sp. Orchid. Pl. 286. 1835.

Habenaria hookeri Torrey ex A. Gray, Ann. Lyceum Nat. Hist. New York 3(first printing): 228. 1835; H. hookeri var. abbreviata Fernald; Platanthera hookeri var. abbreviata (Fernald) W. J. Schrenk

Plants 18–45 cm. Leaves 2, in subequal basal pair, spreading-ascending or lying on ground; bracts 0(–1, very rarely); blade orbiculate, broadly elliptic, or obovate, 5–17 × 4–13 cm. Spikes lax. Flowers resupinate, not showy; calyx green; corolla commonly yellowish green; lateral sepals reflexed; petals narrowly lanceolate-falcate, margins entire; lip projecting to porrect, lanceolate to narrowly lance-rhombic, without basal thickening, 8–23 × 1–6 mm, margins entire; spur slenderly conic, 11–27 mm; rostellum lobes very wide-spreading, angular; pollinaria nearly straight; pollinia remaining enclosed in anther sacs; viscidia suborbiculate; ovary slender to rather stout, mostly 8–20 mm. 2n = 42.

Flowering May--Aug. Dry to mesic coniferous and deciduous forest; mostly 0--500 m; Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que.; Conn., Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Ohio, Pa., N.H., N.J., N.Y., R.I., Vt., Wis.


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