280 ORCHIDACEiE. Arethusa. 



1. Arethusa bulbosa, Linn. Arethusa. 



Linn. sp. 2. p. 950 ; Michx. fl. 2. p. 160 ; Pursh, Jl. 2. p. 590 ; Nutt. gen. 2. p. 194 ; 

 Ell. sk. 2. p. 500 ; Bigel. fl. Bost. p. 325 ; Bart. fl. N. Am. 2. t. 53. /. 1 ; Hook. exot. fl. 

 t. 170 ; Torr. compend. p. 521 ; Bot. mag. t. 2204 ; Beck, bat. p. 346; Darlingt. fl. Cest. 

 p. 502 ; Lindl. I. c; Hook. fl. Bor.-Am. 2. p. 200. 



Pseudobulb ovoid, about the size of a filbert. Scape arising from tlie base of the bulb, 4-8 

 inches high, erect, clothed with 3-4 loosely sheathing scales. From the uppermost sheath 

 proceeds a linear nerved leaf, which originates near the base of the scape : it is at first almost 

 entirely concealed, but finally is protruded an inch or more. Flower an inch and a half long, 

 bright purple, fragrant, with 2 small unequal bracts at the base. Sepals and petals lanceolate. 

 Lip broader, conduplicate near the middle, waved on the margin, variegated with yellow and 

 white, and handsomely bearded in the middle. Column incurved, dilated and membranaceous 

 above the anther. Pollen-masses oblong, 2 in each cell of the anther, collateral. 



Sphagnous swamps : frequent. May. A small but highly ornamental plant. The scape 

 is very rarely 2-flowered. 



10. POGONIA. Juss. gen. p. 65 ; Lindl. gen. p. i\^. POGONlA. 



PoGONiA and TRipnoRA, NuU. 

 [From the Greek, pogon, beard j in allusion to the bearded lip of the flower.] 

 Petals and sepals nearly equal, more or less erect. Lip sessile or unguiculate, cucullate, 

 mostly crested on the inside. Column wingless. Anther terminal. Pollen-masses 2, 

 farinaceous. — Habit various. Flowers purple. 



1. PoGONiA oPHioGLossoiDEs, Ker. Single-leaved Pogonia. 



Scape mostly one-flowered, with a single leaf near the middle and a foliaceous bract near 

 the flower ; lip spatulate-oblong, crested and fringed. — Ker in bot. reg. t. 148 ; Nutt. gen. 

 2. p. 192 ; Bart, fl N. Am. 3. t. 77 ; Hook. exot. fl. t. 70 ; Torr. compend. p. 320 ; Beck, 

 bot. p. 344 ; Darlingt. fl. Cest. p. 502 ; Hook.fl. Bor.-Am. 2. p. 201. Arethusa ophioglos- 

 soides, Linn. sp. 2. p. 951 ; Michx. fl. 2. p. 159; Pursh, fl. 2. p. 590; Bigel. fl. Bost. 

 p. 325. 



Root fasciculate. Scape 9-15 inches high, slender. Leaf 1-3 inches long, varying 

 from lanceolate to ovate, erect, rather acute. Bract leaf-like, linear-lanceolate, about an inch 

 long. Flowers large, mostly solitary (sometimes 2 or 3), pale purple, a lif.le nodding ; the 

 sepals and petals nearly equal, narrowly oblong, obtuse. Column much shorter than the 

 petals, thick and clavate. 



Swamps, particularly where Sphagnum abounds : frequent. June - July. 



