ORCHIS FAMILY 183 



or auricled at the base. Fertile anther 1, 2-celled, erect between the auricles 

 Pollmia 4, two in each sac, waxy, tail-less and without glands. Column em- 

 bracing the lip. [Microstylis Nutt. Achroanthes Raf.] 



Lip ovate, acuminate. 1 \f m 



Lip broadly obcordate. with a tooth in the sinus. 2. M. u 



1. M. mpnophylla (L.) Sw. Corm small, ovoid; stem 1-1.5 dm. high 

 glabrous, striate; leaf-blade 3-5 cm. long, oval, elliptic, or ovate; pedicels 2-4 

 mm. long, nearly erect; capsule ellipsoid, 6 mm. long. Microstylis monophylla 

 Lindl. A. monophylla Greene. Woods: Que. Pa. Colo. Man.; Eu. Plain 

 Submont. Jl-Au. 



2. M. unifolia Michx. Corm globose; stem 1-2.5 dm. high; leaf-blade 

 ovate or nearly orbicular, 2-6 cm. long; flowers greenish, about 2 mm. long; 

 pedicels 6-10 mm. long. Microstylis ophioglossoides Nutt. Achroanthes unifolia 

 Raf. Woods: Newf. Fla. Ala. Neb. Sask. Plain. Jl-Au. 



15. LIPARIS L. C. Rich. TWAYBLADE. 



Low, scapose, perennial herbs, with corms. Leaves 2-6, basal. Flowers in 

 terminal racemes, greenish. Sepals narrow, distinct. Lateral petals distinct, 

 filiform. Lip dilated, often bearing two tubercles above the base. Column 

 elongated, incurved, margined above. Fertile anther solitary, terminal, lid- 

 like. Pollinia 4, two in each sac, waxy; each pair slightly united, without tails 

 and glands. [Leptorchis Thouars.] 



1. L. Loeselii (L.) L. C. Rich. Corm globose; scape 5-20 cm. high, ribbed; 

 leaves basal, elliptic or elliptic-lanceolate, 5-15 cm. long, obtuse; flowers green- 

 ish; lip obovate, pointed, shorter than the sepals; capsule about 1 cm. long, 

 wide-angled on thick erect pedicels. Leptorchis Loeselii McMill. Woods and 

 thickets: N.S.Md. Neb. Sask. Plain. 



16. CYTHEREA Salisb. CALYPSO, VENUS' SLIPPER. 



Acaulescent perennial herbs, with corms. Leaf solitary, basal, petioled, 

 with a broad blade. Flower solitary, terminal, showy. Sepals and lateral 

 petals distinct, similar. Lip large, saccate, with two short spurs near the apex, 

 hairy within. Column dilated, petal-like, bearing a lid-like anther just below 

 the apex. Pollinia two in each sac, united, sessile on a broad gland. [Calypso 

 Salisb.] 



Beard of the lip yellow. 1. C. bulbosa. 



Beard of the lip white. 2. C. occidentalis. 



1. C. bulbosa (L) House. Corm nearly globose, 1 cm. in diameter; scape 

 5-15 cm. high; leaf-blade rounded-ovate, 2-4 cm. long, nearly as wide, acute at 

 the apex, rounded or subcordate at the base; flowers variegated, purple, pink 

 and yellow; petals and sepals 10-15 mm. long, with 3 purple lines; lip large, 15- 

 20 mm. long. Calypso borealis Salisb. Cold woods: Lab. Me. Mich. Colo. 

 Calif. Alaska; Eu. Submont. Subalp. My-Je. 



2. C. occidentalis (Holz.) Heller. Corm rounded-ellipsoid; plant closely 

 resembling the preceding species, but the lip comparatively narrower and longer, 

 usually fully 2 cm. long, and sepals and petals less strongly purple- veined. 

 Calypso bulbosa f. occidentalis Holz. Cold woods: Calif. -Ida. B.C. Sub- 

 mont. Mont. Ap-Je. 



17. APLECTRUM Nutt. ADAM AND EVE, PurrY-ROor. 



Acaulescent perennial herbs, with a chain of corms, representing each a sea- 

 son's growth. Stem scape- like, leafless, a solitary long-petioled leaf being pro- 

 duced from the corm in the fall. Flowers in terminal racemes, showy. Sepals 

 and lateral petals almost similar, narrow. Lip slightly clawed, spur-less, with 

 3 ridges. Fertile anther solitary, a little below the summit of the column. Pol- 

 linia 4. 



