180 ORCHIDACEAE 



5. L. borealis (Cham.) Rydb. Stem tall and leafy, 4-8 dm. high; lowest 

 leaves oblanceolate and obtuse, the rest lanceolate, acute, 5-15 cm. long; spike 

 often rather dense, 1-2 dm. long; flowers 10-14 mm. long; lip rhombic-lanceolate, 

 obtuse, about 5 mm. long. Habenaria dilatata Coult., not Hook. Bogs: Mont. 

 Colo. Wash. -Alaska. Submont. -Mont. Je-S. 



6. L. dilatata (Pursh) Rydb. Stem slender, tall, leafy, 3-6 dm. high; leaves 

 lanceolate, 7-20 cm. long, the lower obtuse, the upper acute; spike 5-25 cm. long, 

 usually rather lax; flowers white, 15-18 mm. long; lip about 7 mm. long. Haben- 

 aria dilatata (Pursh) Hook. Bogs: Lab. N.Y. -Neb. Sask. Boreal. Je-Au. 



7. L. leucostachys (Lindl.) Rydb. Stem stout and tall, 6-10 dm. high; 

 lower leaves oblanceolate, 1-2 dm. long; spike 1-3 dm. long, rarely very dense; 

 flowers 15-20 mm. long; lip about 8 mm. long. Habenaria leucostachys (Lindl.) 

 S. Wats. Bogs: Alaska Ida. -Utah Calif. Submont. Je-Au. 



8. L. ensifolia Rydb. Stem strict, 3-4 dm. high, light colored, few leaved; 

 leaves linear-lanceolate, attenuate, slightly falcate, 1-1.5 dm. long; flowers 

 greenish, about 15 mm. long; lip linear, about 8 mm. long, thick; spur about 

 1 cm. long. Bogs: N.M. Utah Ariz. Son. Jl. 



9. L. laxiflora Rydb. Stem slender, 4-6 dm. high; lower leaves oblanceolate, 

 8-10 cm. long; spike 1-2 dm. long, few-flowered; flowers greenish, 10-12 mm. long; 

 lip about 6 mm. long; spur about 8 mm. long, slightly clavate. Bogs: Ore. 

 Colo. Utah. Son. 



8. PIPERIA Rydb. WOOD ORCHID. 



Somewhat leafy-stemmed plants, but the leaves usually near the base and 

 withering at or before the anthesis. Tubers spherical or rounded ellipsoid. 

 Flowers greenish or white; sepals and petals 1-nerved or very obscurely 3-nerved; 

 the upper erect, the lateral ones spreading. Lateral petals free, lanceolate or 

 linear-lanceolate, oblique. Lip linear-lanceolate to ovate, obtuse, truncate or 

 hastate at the base, concave, united with the bases of the lower sepals, bordered 

 with an erect margin which connects the lip with the column. Anther-sacs 

 parallel, opening nearly laterally. 



Spur slightly exceeding the lip. 1. P. unalaschensis. 



Spur 2-3 times as long as the lip, filiform. 



Lip linear to lanceolate, about 6 mm. long; spike dense; spur 15-18 mm. long. 



2. P. multiflora. 



Lip ovate or ovate-lanceolate; spike looser; spur 10-12 mm. long. 3. P. elegans. 



1. P. unalaschensis (Spreng.) Rydb. Stem strict, slender, 3-5 dm. high, 

 leafy only near the base; leaves oblanceolate, obtuse or acutish, 1-1.5 dm. long; 

 stem-leaves bract-like; spike long and lax, 1-3 dm. long; flowers greenish, 8-10 

 mm. long; petals and sepals 2-4 mm. long; lip oblong, obtuse; spur filiform or 

 slightly clavate. Habenaria unalaschensis (Spreng.) S. Wats. Damp woods: 

 Mont. Colo. Calif. B.C. (? Alaska); also Que. Submont. Mont. Je-Au. 



2. P. multiflora Rydb. Stem stout, 4-6 dm. high; basal leaves oblong 

 or oblanceolate, obtuse or acutish, 1-1.5 dm. long; upper stem-leaves much re- 

 duced and bract-like; flowers greenish white, spreading, about 1.5 cm. long; 

 spur 15-18 mm. long, filiform. Damp woods: Wash. Mont. 'Calif. Submont. 

 Je-Au. 



3. P. elegans (Lindl.) Rydb. Stem slender, strict, 4-7 dm. high; basal 

 leaves 2 or 3; blades lanceolate or oblanceolate or rarely oval, acute or obtuse, 

 8-15 cm. long; stem-leaves much reduced, lanceolate; spike usually lax, 1.5-3 

 dm. long; flowers greenish white, about 1 cm. long: spur filiform. Habenaria 

 elegans (Lindl.) Bolander. Piperia elongata Rydb. Damp woods: B.C. Ida. 

 Calif. Submont. Je-Au. 



9. SERAPIAS L. HELLEBORINE. 



Caulescent herbs, with rootstocks and fibrous roots. Leaves alternate, 

 plaited, many-nerved, clasping. Flowers in bracted terminal racemes. Sepals 



