114 Orchidaceae < 
A. Spur slightly longer than the lip. W. C. E. (Habenaria unalaskensis.) 
P, unalaskensis Rydb. 
AA. Spur 2—23 times as long as the lip. 
B. Stem 3—7 dm. high; leaves withering at flowering time; spike lax or dense, 
10—30 cm. long; upper sepals lanceolate. W.C. E. (Habenaria elegans; P. 
leptosepala; P. multiflora.) 
P. elegans Rydb. 
BB. Stem 2—3 dm. high; leaves withering before flowering time; spike dense, short, 
4—10 cm. long; upper sepals ovate. W. (Habenaria michaeli.) 
P. michaeli Rydb. 
LIMNORCHIS ORCHIS 
Roots fusiform, tuber-like; stem leafy. Leaves persisting until fruit is mature. Flow- 
7-veined, free, 

ers small, greenish or white, in a terminal spike. Sepals and petals 3 
spreading; lip entire. Anther-cells nearly parallel, opening in front; glands naked. Stig- 
ma-beak without appendages. (Gk. limne—swamp or pool, orchis—the old Greek name 
of some of these plants. ) 
A. Flowers green or purplish. 
B. Spur only 1/3—l4, as long as the tip; lip linear; spike long, 1—3 dm., not 
dense; flowers purplish, W.C. E. (Habenaria gracilis; Habenaria stricta.) 
L. stricta Rydb. 
BB. Spur equaling or exceeding the lip; lip lanceolate; spike short, dense; flowers 
green. C. E. (Habenaria hyperborea; L. hyperborea.) 
L. viridiflora Rydb. 
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. (Habenaria sparsiflora; 
L. laxiflora.) L. sparsifiora Rydb. 
DD. Leaves all linear to linear-lanceolate, acute to acuminate; later sepals ovate, 
acuminate; lip 12 mm. long. U. «(Habenaria aggregata.) 
L. aggregata (How.) 
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. (Habenaria dilatata; L. borealis.) 
L. dilatata Rydb. 
EE. Spur | /3—14% longer than the lip; flowers 154-20 mm. long. W. C. E. 
(Habenaria leucostachys; L. leucostachys robusta.) 
L, leucostachys Rydb. 
LYSIAS 
Leaves 2, basal; in ours flat on the ground, orbicular; green above, silvery beneath, 
1—2 dm. wide. Flowers in a raceme, greenish-white (ours), comparatively large, irreg- 
ular, spurred. Upper sepal rounded, short; lateral sepals spreading, falcate-ovate. Lip 
longer than the petals, entire. Anther-cells converging above; pollen-masses 2. Cap- 
sule ovoid. (Gk. lysis==a loosening. Why?) W.C. E. (Habenaria orbiculata.) 
L. orbiculata Rydb. 

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