ORCHIDACEAE. Ill 



Piperia michaeli (Greene) Rydb. Stem stout, 20-30 cm. high; basal leaves 

 elliptic to oblanceolate; stem leaves numerous, much reduced; spike thick 

 and very dense; flowers greenish. 



Along the sea coast, 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. 



In open woods, very common. 



Piperia multiflora Rydb. Much like P. elegans but stouter; spike dense; 

 flowers usually white. 



In open woods. Perhaps only a form of P. elegans. 



Piperia leptopetala Rydb. Slender, 30-50 cm. high; basal leaves oblong- 

 lanceolate; spike long and loose; flowers greenish. 



Growing with P. elegans, of which it may be only a form. 



140. 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 and with small 

 beak-like processes at the base. 



Lysias orbiculata (Pursh) Rydb. Leaves 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. 



Rare in deep mountain woods. 



141. 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 8-40 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. 



In dry woods, common. 



142. PERAMIUM. 



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

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



