70 ORCHIDACEAE. 



Ophrys convallarioides (Sw.) W. F. Wight. Similar to 0. caurina but 

 not so tall; leaves broad, oval or ovate, obtuse; inflorescence glandular; 

 flowers larger, the pedicels scarcely longer than the bracts or the ovary; lip 

 large, 9 mm. long, cuneate, retuse, with a short triangular tooth on each side 

 near the base. In deep moist woods. 



97. LIMNORCHIS. 



Leafy plants with thick fleshy roots, or elongated conic un- 

 divided tubers, and small greenish or whitish flowers in a long 

 spike; sepals and petals free and spreading, several-nerved; lip 

 entire; beak of the stigma without appendages; anther-cells 

 nearly parallel, wholly adnate; gland naked; pollinia granular 

 with caudicula at the base. 



Flowers white. L. leucostachys. 



Flowers green or purple-tinged. 



Spur clavate, much shorter than the lip; spike long and 



loose. L. stricta. 



Spur not clavate, about as long as the lip; spike short and 

 dense. 



Limnorchis leucostachys (Lindl.) Rydb. Stem strictly erect, 30-90 cm. 

 high from a fusiform tuber; leaves lanceolate, acute, the upper ones smaller; 

 spike 6-30 cm. long, usually rather dense; bracts acuminate, equalling or 

 exceeding the ovary; sepals 5-6 mm. long, the upper one broader; lip lanceolate, 

 6-7 mm. long; spur 10-12 mm. long, slender, acute. In wet places, especially 

 in the mountains. 



Limnorchis leucostachys robusta Rydb. Spike dense; spur obtuse. More 

 common than the species and in similar places. 



Limnorchis stricta (Lindl.) Rydb. Stems stout, leafy, 50-100 cm. tall; 

 leaves lanceolate, acuminate, 10-15 cm. long, gradually diminishing upward 

 into the bracts; spike slender, 20-30 cm. long, loose, the lower flowers remote; 

 bracts narrowly lanceolate, exceeding the lower flowers, equalling the upper 

 ones; sepals 3-nerved; lip linear, thick, as long as the spur, which is inflated 

 and very obtuse at the tip. Springy places in the foothills. 



Limnorchis viridiflora (Cham.) Rydb. Stems 20-40 cm. high from fusi- 

 form tubers; basal leaves oblanceolate, obtuse, the upper lanceolate, acute; 

 flowers pale green, 10-12 mm. long; upper sepal ovate, broader than the 

 spreading lanceolate lateral ones; lip lanceolate, obtuse, 4-5 mm. long, equalling 

 the clavate spur. Spokane County, Suksdorf. 



98. PIPERIA. 



Much like Limnorchis in the form of the flowers but the true 

 leaves basal or nearly so, the cauline usually small or bract-like; 

 flowers small, white or greenish; sepals ovate, 1-nerved, sub- 

 equal; petals and lip of very much the same shape and slightly 

 smaller and darker than the sepals; column very short; anther 

 very large; cells parallel, the gland very small. 



Flowers greenish; spur short. P. unalaschensis . 



Flowers white; spur long. P. elegans. 



