ORCHIDACEAE. 71 



Piperia unalaschensis (Spreng.) Rydb. Stems stout, 20-40 cm. tall, 

 leafy at base, bracteate above; leaves 2-3, oblanceolate, obtuse, about 15 cm. 

 long, usually withering before the flowers bloom; spike narrow, rather dense, 

 8-15 cm. long; bracts triangular, acute or acuminate, shorter than the ovary, 

 a few along the stem below the spike; flowers small, greenish; sepals and petals 

 lanceolate, 1-nerved, 1.5-2 mm. long; lip scarcely exceeding the petals; spur 

 curved, about 3 mm. long; capsule oblong, sessile. Pullman, very rare. 



Piperia elegans (Lindl.) Rydb. Stouter than P. unalaschensis, somewhat 

 taller; basal leaves 2-4, oblong or lanceolate, 10-15 cm. long, 3-5 cm. wide, 

 obtuse or acute; cauline bracts oblong, acuminate, 1-3 cm. long; spikes usually 

 dense, 8-20 cm. long; bracts ovate, acuminate, about equalling the white flowers 

 or the mature ovary; sepals and petals similar, 4 mm. long, obscurely 3-nerved; 

 lip like the petals, the spur slender, 7-10 mm. long; capsule oblong, nearly 

 sessile. Pullman, very rare. 



99. LYSIAS. 



Leaves two, large, basal; sepals large and spreading; petals 

 small and narrow; lip linear, entire; spur long; beak of stigma 

 without appendages; anther-cells widely diverging with small 

 beak-like processes at the base. 



Lysias orbiculata (Pursh) Rydb. Leaves usually 2, elliptic to orbicular, 

 prostrate on the ground, bright green and shining above, paler beneath, thick, 

 usually 10-15 cm. long; scape 6-30 cm. high, bearing 1-3 lanceolate bracts; 

 spike loose, 10-20-flowered; flowers white; lateral sepals ovate, the upper 

 orbicular; lip linear-oblong, 15-20 mm. long; spur slender, 15-25 mm. long. 

 In deep mossy woods, usually in colonies. 



100. IBIDIUM. 



Roots clustered ; stem bracted above, leaf-bearing below or at 

 the base; flowers small, white, yellowish- or greenish-white in a 

 more or less spirally-twisted raceme; lateral sepals lanceolate, 

 the upper united with the oblong petals; lip short-stalked with 

 a callus on each side of the base, the summit somewhat dilated; 

 column short, bearing the ovate stigma on the front and the 

 2-celled erect anther sessile or nearly so on the back. 



Ibidium romanzoffianum (Cham.) House. Plants 8-47 cm. tall from roots 

 5-8 mm. thick, leafy below and leafy-bracted above; leaves oblong-lanceolate 

 to linear; scape glandular-pubescent above; cauline bracts 2-3; raceme dense, 

 cylindrical; perianth yellowish or whitish, 6-12 mm. long; bracts of the raceme 

 often much longer than the flowers; sepals and petals united. Blue Mountains, 

 Homer. 



101. PERAMIUM. 



Herbs with bracted erect scapes and thick fleshy-fibrous roots; 

 leaves basal, tufted, often blotched with white; flowers in bracted 

 spikes; lateral sepals free, the upper ones united with the petals 

 into a hood-like structure (galea); lip sessile, entire, roundish, 

 ovate, concave or saccate, without protuberances, its apex re- 



