ORCHIDACEAE 325 



1. Achroanthes unifolia (Michx. ) Raf. Leaves solitary or sometimes 2; blade 

 oblong, ovate or oval, 2-6 cm. long, obtuse or acutish, entire, with bases clasping the scape 

 to about the middle : scapes 1-3 dm. tall, usually with a sheathing scale at the base : 

 raceme erect, 2-10 cm. long : pedicels very slender, spreading : perianth greenish : sepals 

 oblong, about 1 mm. long : lip 3-toothed at the apex : capsules oval or globose-oval, 5-6 

 mm. long. [Microstylis ophioglossoides Nutt.] 



In open woods and on banks, Newfoundland to Minnesota, Florida, Alabama and Missouri. 



2. Achroanthes monophylla (L. ) Greene. Leaf solitary; blade oblong-elliptic to 

 oval, 3-7 cm. long, obtuse, entire, narrowed into a long sheathing base : scape 1-2 dm. 

 tall : raceme slender, 3-10 cm. long, often continuous : pedicels ascending or erect, 1-4 mm. 

 long, or rarely shorter: sepals linear or nearly so, 1.5-2 mm. long, acute: lip ovate or 

 nearly triangular, 2 mm. long, acuminate, erose on the sides : capsules oval or oblong-oval, 

 4-5 mm. long, surpassing the pedicels in length. 



In woods, Quebec to Minnesota, Pennsylvania and Texas. 



3. Achroanthes Florldana (Chapm. ) Greene. Leaves 2, basal; blades ovate to 

 oblong-ovate, 3-10 cm. long, slightly pointed, rounded or subcordate at the base, thence 

 prolonged into narrow sheaths : scapes 1-3 dm. tall : bracts oblong or oblong-lanceolate : 

 pedicels surpassing the bracts : perianth greenish, 2-3 mm. broad : sepals oblong, about 3 

 mm. long, spreading : lateral petals reflexed, twisted : lip cordate, abruptly pointed : cap- 

 sules oblong-obovate, 6-7 mm. long, about as long as the pedicels. 



In low woods, Florida. 



26. LEPTORCHIS Thouars. 



Low scapose herbs, with short corms. Leaves 2-6 at the base of the scape, spreading, 

 commonly accompanied by several scales. Scape topped by a loosely-flowered raceme. 

 Perianth greenish. Sepals 3, narrow. Lateral petals nearly filiform, about as long as 

 the sepals. Lip flat, dilated, often bearing 2 tubercles above the base. 'Column elon- 

 gated, incurved, thickened and margined above. Anther terminal, lid-like. Pollen- 

 masses 4, two in each sac, waxy, each pair slightly united, without tails and glandless. 

 Capsules erect or ascending. [Liparis L. C. Rich.] TWAYBLADE. 



Petals linear : lip 2.5-3.5 mm. broad : capsules oblong. 1. L. Loesdii. 



Petals filiform or linear-filiform : lip 9-12 mm. broad : capsules clavate-oblong. 2. L. liliifolia. 



1. Leptorchis Loeselii (L. ) MacM. Leaf-blades elliptic or elliptic-lanceolate, 5-17 

 cm. long, acutish or obtuse, narrowed into petiole-like bases and with the lower part more 

 or less involutely folded : scape 0.5-2 dm. tall, ridged: raceme 1.5-8 cm. long, few-flow- 

 ered : bracts minute, 1-2 mm. long : pedicels erect or nearly so : sepals narrowly lanceo- 

 late, spreading : lateral petals linear, more or less reflexed : lip with a suborbicular blade 

 2.5-3.5 mm. broad, abruptly pointed, rather shorter than the sepals and petals : capsules 

 oblong, 10-14 mm. long. 



On springy banks and in wet thickets, Nova Scotia to Saskatchewan, Maryland, Alabama and 

 Missouri. Also in Europe. Spring and early summer. 



2. Leptorchis liliifolia (L. ) Kuntze. Leaf-blades relatively broad, ovate, oval or 

 oblong-ovate, 5-15 cm. long, obtuse or sometimes acute, narrowed into short sheathing 

 bases : scape 1-3 dm. tall, often accompanied by one of the preceding year : raceme 3- 

 15 cm. long : bracts 1-3 mm. long : pedicels ascending, thickened upward : sepals linear : 

 lateral petals linear-filiform or filiform, sometimes surpassing ,the sepals : lip erect, about 

 as long as the petals, 9-13 mm. broad, cuneate or obovate-cuneate, apiculate : column 

 dilated at the apex, incurved : capsules clavate-oblong, 12-18 mm. long. 



In thickets and open woods, Maine to Minnesota, Georgia and Missouri. Spring and summer. 



27. CORALLORHIZA R. Br. 



Saprophytic more or less colored herbs, with masses of coral-like branching roots. Stems 

 sometimes clustered. Leaves reduced to sheathing scales. Flowers in terminal racemes. 

 Perianth conspicuous but not showy. Sepals nearly equal, the two lateral united with the 

 foot of the column forming a short spur, which is adnate to the top of the ovary. Lateral 

 petals about as long as sepals, 1-3-nerved. Lip spreading or recurved, adherent to the 

 base of the 2-edged or winged column, 1-2-ridged below. Anther terminal, lid-like. 

 Pollen-masses 4, a pair in each sac, oblique, free, soft-waxy. Capsules spreading or 

 drooping. CORAL-ROOT. CRAWLEY-ROOT. 

 A. Lip not 3-lobed, but often erose or finely toothed. 



Sepals 1.5-2.5 mm. long : lip oblong or oval, 1.5-2. 5 mm. long. 1. C. micrantha. 



Sepals 2.5-10 mm. long : lip obovate or suborbicular, 2.5-10 mm. long. 



Lip not notched, clawless : perianth 6-8 mm. long : column narrowly winged. 2. C. odontorhiza. 

 Lip notched, clawed : perianth 12-14 mm. long : column strongly winged. 3. C. Wisteriana. 



