294 FLORA. 



1. Limnorchis hyperborea (L.) Rydb. TALL LEAFY GREEN ORCHIS. (I. F. 

 f. noo.) Stem rather stout, 2-6 dm. high. Leaves lanceolate, mostly acute, 5-30 

 cm. long; spike narrow, 7-20 cm. long; flowers small, divaricate, greenish or green- 

 ish yellow; sepals and petals ovate, obtuse, 4-6 mm. long; upper sepal crenulate 

 at the apex; lip lanceolate, entire, obtuse, about 7 mm. long; spur seldom equal- 

 ling the lip, blunt, slightly incurved, decidedly clavate ; glands small; ovary more 

 or less twisted ; pod I cm. long, 5 mm. wide. In bogs and wet woods, N. S. to 

 Alaska, south to N. J. May-Aug. [Habenaria hyperborea (L.) R. Br.] 



2. Limnorchis media Rydb. n. sp. INTERMEDIATE BOG ORCHIS. Stem stout, 

 4-8 dm. high. Leaves lanceolate, acute, 1-2 dm. long ; spike long, densely 

 flowered ; bracts rather large and with scabrous margins ; flowers divaricate, 

 greenish or purplish; sepals ovate-oblong, 4-6 mm. long; petals lanceolate, obtuse; 

 lip lanceolate, entire, obtuse, slightly dilated at the base. 5-7 mm. long ; spur 

 slightly exceeding the lip, curved, obtuse, scarcely at all thickened at the apex; 

 ovary somewhat twisted ; pod about I cm. long and 5 mm. in diameter. It has 

 been confused with L. hyperborea and L. dilatata. In bogs, Can. and N. Y., west 

 to Minn. Type specimen from Quebec. June-Aug. 



3. Limnorchis Huronensis (Nutt.) Rydb. HURON ORCHIS. Stem slen- 

 der, 2-3 dm. high. Lower leaves oblanceolate, obtuse; upper lanceolate and acute; 

 spike long, rather lax; bracts lanceolate, the lower often twice as long as the flowers; 

 flowers almost erect, light green ; sepals oblong, 1.5-2 mm. long; lip linear-lan- 

 ceolate, entire; spur generally exceeding the lip, scarcely clavate, curved, often 

 acutish; pod about I cm. long and 3 mm. in diameter. It resembles a slender Z. 

 hyperborea, differing in the smaller erect flowers, longer and narrower spur and pod. 

 In swamps, Can. to N. Y. ; apparently also in the Black Hills of S. Dak. June- 

 July. \Orchis Huronensis Nutt.] 



4. Limnorchis dilatata (Pursh) Rydb. TALL WHITE BOG ORCHIS. (I. F. 

 f. noi.) Stem slender, leafy, 3-6 dm. high. Leaves lanceolate, 7-20 cm. long, 

 obtuse or acute ; spike 5-25 cm. long ; bracts acute, the lower longer than the ovary, 

 the upper shorter; flowers small, white ; sepals ovate, obtuse, nearly 6 mm. long 

 and 2-3 mm. wide; lip entire, dilated or obtusely 3-lobed at the base, obtuse at the 

 apex, shorter than the blunt incurved slightly clavate spur; glands close together, 

 strap-shaped, nearly as long as the pollinia and caudicle; stigma with a trowel- 

 shaped beak between the bases of the anther-sacs. In bogs and wet woods, N. S. 

 to Sask., south to Me., N. Y. and Neb. June-Sept, [flabenaria dilatata (Pursh) 

 Hook.] 



5. Limnorchis fragrans Rydb. n. sp. FRAGRANT ORCHIS. Stem very slender, 

 leafy above, 23 dm. high. Leaves linear, about I dm. long and 8-10 mm. wide, 

 acute; spike slender and lax ; bracts lanceolate, acuminate, the lower longer than 

 the flowers ; flowers small, pure white, very fragrant ; sepals lanceolate, often 

 acutish, '-1.5-2 mm. wide and strongly striate ; lip about 5 mm. long, narrowly 

 linear, dilated at the base, obtuse, shorter than the curved filiform spur ; otherwise 

 as the preceding. In bogs, Willoughby Mountains, Vt. July. ^ 



8. LYSIAS Salisb. 



Plants with tubers or fleshy roots; stem scapose. Leaves 2, basal. Flowers 

 greenish or white ; sepals free, large and spreading ; petals small and narrow ; 

 lip entire, linear or nearly so ; spur long and slender, generally longer than the 

 elongated, straight ovary. Beak of the stigma without appendages. Anther-sacs 

 widely diverging, their narrow beak-like bases projecting forward ; stalk of the 

 pollen-mass laterally affixed to the back of the orbicular gland, whose face is 

 turned inward. Pod cylindric-clavate, distinctly stipitate. A circumboreal genus 

 of about half a dozen species, separated independently by Salisbury in 1812 as 

 Lysias and by Richard in 1818 under the name Platanthera. 



Scape bracted. i. L. orbiculata. 



Scape naked. 2. L. Hookeriana. 



i. Lysias orbiculata (Pursh) Rydb. LARGE ROUND- LEAVED ORCHIS. (I. F. 

 f. 1096.) Scape stout, bracted, 3-6 dm. high, occasionally bearing a small leaf. 

 Leaves orbicular, spreading flat on the ground, shining green above, silvery be- 



