68 ORCHIDACEAE (ORCHID FAMILY) 



but usually narrower; column with an anther at each side, with petal-like 

 stamen at tip. Pollen masses 4. Stigma disklike, obscurely 3-lobed. 

 (Gk. kypris = Venus, pedilon = a shoe; the corolla is slipper-like.) 



A. Stem with more than 2 leaves; lip 1.4 mm. or more long, color not as in AA. 

 B. Lip white to rose, veined with purple. 



C. Flowers 1-3; sepals narrowly linear-lanceolate, brownish ; lip 3-5 cm. long. 

 C. E. C. montanum (LARGE LADY'S-SLIPPER) 



CC. Flowers 1-20; sepals widely oval, greenish yellow; lip 1.7-2.1 cm. long. 

 U. C. C. calif ornicum 



BB. Lip bright yellow, 1.5-3 cm. long; flowers 1-3. E. 



C. parviflorum (YELLOW LADY'S-SLIPPER) 



AA. Stem with 2 nearly opposite leaves near its middle and i small lanceolate bract 

 above them; lip 8-13 mm. long, greenish yellow, with brown or purplish margins. 

 E. C. fasciculatum (BROWN LADY'S-SLIPPER) 



PIPERIA (ORCHIS) 



Stem leafy-bracted. Flowers small, greenish white, in a terminal spike. 

 Sepals and petals i~3-veined. Pollen masses 2, parallel. Stigma a small 

 beak between the anther cells. (Meaning not determined.) 



A. Spur slightly longer than the lip. W. C. E. P. unalaskensis 



AA. Spur 2-3 times as long as the lip. 



B. Leaves withering at flowering time; spike 10-30 cm. long; upper sepals lanceo- 

 late. W. C. E. P. elegans 

 BB. Leaves withering before flowering time; spike 4-10 cm. long; upper sepals 

 ovate. W. P. michaeli 



LIMNORCHIS (ORCHIS) 



Stem leafy. Flowers small, greenish or white, in a terminal spike. Sepals 

 and petals 3~7-veined, free, spreading; lip entire. Pollen masses 2, parallel. 

 Stigma beak without appendages. (Gk. limne = a swamp or pool, 

 orchis = the old Greek name of some of these plants.) 



A. Flowers green or purplish. 



B. Spur only $-$ as long as the lip; lip linear; spike long, 1-3 dm., not dense; 

 flowers purplish. W. C. E. L. stricta 



BB. Spur equaling or exceeding the lip; lip lanceolate; spike short, dense; flowers 

 green. C. E. L. viridiflora 



AA. Flowers white or whitish. 



C. Lip linear; spike not dense. 



D. Lower leaves oblanceolate, obtuse; upper leaves lanceolate, acute; lateral 

 sepals lanceolate, acute; lip 6-8 mm. long. C. E. L. sparsiflora 



DD. Leaves all linear to linear-lanceolate, acute to acuminate; lateral sepals ovate, 

 acuminate; lip 12 mm. long. U. L. aggregata 



CC. Lip lanceolate; spike lax or dense. 



E. Spur shorter than the lip, or very little longer; flowers 12-14 mm. long. W. C. E. 



L. dilatata 

 EE. Spur J-i longer than the lip; flowers 15-20 mm. long. W. C. E. 



L. leucostachys 



