228 COMMOK CANADIAN WILD PLANTS. 



■*-- ■*- Lip without a spur. Anther on the back of the column. 

 ■w- Flowers small, white, in a slender spike. 



3. Splran'thes. Spike (of white or whitish flowers) more or less spir- 



ally twisted. Sepals and petals narrow and generally connivent. 

 Lip oblong, the lower part embracing the ^-olumn, and with a pro- 

 tuberance on each side of the base. 



4. Cioodye'ra. Flowers very much as in Spiranthes, but the lip sac- 



shaped, and without protuberance at the base. Leaves white- 

 veiny, in a tuft at the base of the scape. 



♦+ -M- Flowers racemose, varying from greenish-yelloio to purple. Stem 

 very leafy. 



5. Epipac'tis. Stem i-2 feet high, stout, leafy. Leaves broadly ovate, 



the upper narrower. Sepals and petals nearly equal, spreading. 

 Lip deeply concave at the base, constricted and somewhat joined 

 in the middle, dilated andpetaloid above. Anther sessile behind 

 the stigma, on a slender-jointed base. Ovaries reflexed at ma- 

 turity. 



■•--»--•- Lip without a spur. Anfh^r on the apex of the style, hinged like 

 a lid. 



** Pollen-masses 2 or 4, powdery or pulpy, without stalk or gland. 



6. LIs'tera. Flowers small, greenish or brownish-purple, in a spike or 



raceme. Stem bearing a pair of opposite sessile roundish leaves 

 near the middle. Lip flat, mostly drooping, 2-lobed at the apex. 



7. Calopo'gou . Ovary not twisted, the lip consequently turned towards 



the stem. Flowers large, pink-purple, 2-6 at the summit of the 

 scape ; the lip spreading at the outer end, and beautifully bearded 

 above with coloured hairs. Leaf gi-ass-like, only one. Pollen- 

 masses 4. 



8. Arethu'sa. Flower solitary, large, rose-purple. Lip dilated, re- 



curved, spreading at the end. Sepals and petals lanceolate, nearly 

 alike, arching over the column. Pollen-masses 4. Scape low, 

 sheathed, from a globular solid bulb, with a single linear-nerved 

 leaf hidden in the sheaths of the scape. 



9. Pogo'nia* Flower solitary, irregular, large, sweet-scented, pale 



rose-colour or white. Column club-shaped. Lip crested and 

 fringed. Pollen-masses 2. Stem 6-9 inches high, with a single 

 oval 01* lance-oblong leaf near the middle, and a smaller one, ov 

 bract, near the flower. 



y* ++ Pollen-masses 4, smooth and waxy, attaclied direcUy to a large 

 gland : no stalks. 



10. Calyp'so. Flower solitary, large, showy, variegated with purple, 



pink, and yellow. Lip large, inflated, sac-shaped, 2-pointed under 

 the apex. Scape short, from a solid bulb, with a single ovate or 

 slightly heart-shaped leaf below. 



