348 CLASS XX. ORDER I. 



Arethusa bulbosa. L. Bulbous Arethusa. 



Root globular; scape sheathed ; spathe two leaved. 

 L. 



The root of this beautiful plant is a tuber or solid bulb, with 

 the stem ascending from one side. In small plants the stem ap- 

 pears perfectly leafless, and only invested with a few alternate 

 sheaths. In large plants the upper sheath expands into a short 

 lanceolate leaf. This leaf is always found when the plant is in 

 fruit. Stem erect, smooth, bearing one flower, rarely two, in- 

 vested at base with a minute, two leaved spathe. Germ fur- 

 rowed. Petals five, of a bright, crystalline purple, cucullate or 

 curved forward, three exterior and two interior, all successively 

 adnate to the style above the germ. Style wedge shaped, in- 

 curved, supporting the anther near its end. Lip spreading, 

 deflexed, curled and crenate, bearded in the middle, variegated 

 with purple, yellow and white. Capsule oblong-lanceolate, six 

 ribbed, six valved. — Wet meadows, Brookline, West Cam- 

 bridge. — May, June. 



^§ Subgenus Pogonia. Lip sessile ; petals distinct ; pollen 

 farinaceous. 



Arethusa ophioglossoides. L. Adders^ Tongue Arethusa. 

 Root fibrous; scape furnished with an oval leaf, 

 and a lanceolate spathe-like leafet. L. 

 Syn. Pogonia oPHioGLOssorDES. Brown. 



The root has no appearance of a bulb. Stem erect, with two 

 remote leaves, one about midway of the stem, oval and sheath- 

 ing at base ; the other near the flower, ovate-lanceolate, much 

 smaller. Flower pale purple, nodding, its petals spreading more 

 than in the last species. Lip of the nectary spreading, fringed at 

 the edge. Pistil bearing the anther near its end, and shorter 

 than in the foregoing. — Meadows. — June. 

 Arethusa verticillata. L. Whorled Arethusa. 



Leaves five, oblong-lanceolate, whorled; flower 

 single; the three outer petals very long and linear, 

 the inner ones lanceolate, obtuse; lip three lobed ; the 

 middle lobe undulated. 



