ORCHIS FAMILY 183 



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

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

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



Lip ovate, acuminate. 1. M. monophylla. 



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



1. M. monophylla (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 solitarj^ terminal, lid- 

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

 and glands. [Lcptorchis 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, sho^\•^•. 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 hp white. 2. C. occidentalis. 



1. C. bulbosa (L) Hou.se. 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, PuTXY-ROor. 



Acaulescent perennial hcrljs, 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. 



