ORCHIDACEAE (ORCHlD FAMILY) 12f 



flowered: flowers green: sepals ovate-lanceolate, spreading: petals narrow, even 

 filiform; lip oblong spatulate, more than twice as long as the white sac-likt 

 spur. — Northern Wyoming, eastward and to the Atlantic. 



5. PIPERIA Rydb. 



Slender strict plants from rounded tuberous roots, and with mostly basal 

 leaves, those of the stem being reduced and bract-like. Leaves short-lived, 

 usually withering or dead at anthesis. Flowers greenish or white. Sepals and 



Eetals 1-nerved or obscurely 3-nerved, linear-lanceolate to ovate, truncate or 

 astate at base. Stigma a small beak in the angle between the anther cells. 

 Capsule ellipsoid. — Habenaria in part. 



1. Piperia unalaschensis (Spreng.) Rydb. Bull. Tprr. Bot. Club 28: 270. 

 1901. Stem, very strict and slender, 3-5 dm. high, leafy below only; leaves 

 oblanceolate, obtusish or acute; stem leaves bract-like: bracts lanceolate or 

 broader, shorter than the spirally arranged flowers: sepals and petals lanceo- 

 late, greenish or the lateral purplish; lip oblong, obtuse, siibhastately lobed 

 near the base; the spur linear or slightly clavate, barely longer than the lip. 

 Habenaria unalaschensis. — From Colorado to far northwestern America. 



6. SPIRANTHES Richard. Ladies' Tbesses 



Erect strict herbs with fleshy usually fascicled roots and slender more or less 

 leafy stems. FJowers white, crowded-spicate, in 1-3 spirally arranged rows. 

 Perianth oblique upon the ovary, the sepals and petals corinivent ; lip oblong, 

 embracing the column, with 2 callosities at base, and dilated spreading undu- 

 late summit. Columns very short, terminating in a stout terete stipe. Anther 

 erect and subsessile at top of column. Stigma with a bifid beak. 



1; Spiranthes stricta (Rydb.) A. Nels. Glabrous, rather stout, 1-3 dm. 

 high: leaves oblong-lanceolate to linear: spike dense; 3-ranked, conspicuously 

 bracteate, 3-8 cm. long: perianth curved: lip recurved, contrapted below the 

 rounded wavy-crenulate summit; callosities smooth, often obscure. Spiranthes 

 Romanzoffiana. (Gyrostachys stricta Rydb. Mem. N. Y. Bot. Gard. 1: 107. 

 1900.) — Colorado to Montana and thence across the odntinent. '■ 



7. EPIPACTIS R. Br. 



Stems leafy, stout, from creeping rootstocks. Flowers few, pediceled, .with 

 conspicuous divergent bracts and spreading perianth. ■ gepals and petals 

 nearly equal; lip narrowly constricted and ; somewhat jointed in the middle, 

 concave and auriculate at base, dilated a,bove. Column short, erect. Capsule 

 at maturity deflexed. 



1. Epipactis gigantea Dougl. Hook. Fl. Bor. Am. 2: 220. 1839. Three to 

 10 dm. high, nearly smooth: leaves from ovate below to narrowly lanceolate 

 above, somewhat scabrous on the veins beneath: raceme pubescent: flowers 

 greenish, strongly veined with purple: saccate base of the lip with erect wing- 

 like margins, strongly nerved; the nerves callous-tuberculate near the base. — 

 Western Texas and southwestern Colorado to Califorrua and Washington. 



8. LISTERA R. Br. Twaybla.de 



Stems from fibrous and creeping roots, low, with a pair of broad sessile 

 leaves, near the middle. Flowers small, in a loose raceme. Perianth spread- 

 ing. Sepals and petals similar; lip flat, 2-lobed, free, longer than the sepals. 

 Column free and naked. — In cold damp woods and thickets. 



Raceme pubescent , . , . . . . . , 1. L. coQvallarioides. 

 Raceme glabrous 2. L. nephrophylla, 



1. Listera convallarioides (Sw.) Torr. Comp. 320. 1826. Stem slender, 

 10-25 cm. high, naked excepting one or two sheaths at base and the pair of 



