476 ORCHIDACEAE. 
2. Achroanthes unifdlia (Michx.) 
Raf. Green Adder’s-mouth. 
(Fig. 1135.) 
ct de unifolia Michx. Fl. Bor. Am. 2: 157. 
1893. 
Achroanthes unifolia Raf. Med. Rep. (II.) 5: 
352. 1808. 
cor a ae ophioglossoides Nutt. Gen. 2: 196. 
1818. 
Stem glabrous, striate, 4’-10’ high. Leaf 
clasping the stem near the middle, oval or 
nearly orbicular, 1/-214’ long, 10//—1 4’ wide; 
raceme 1/—3/ long, sometimes 1’ thick; flow- 
ers greenish, about 1/’ long, the pedicels 
very slender, spreading, 3’’-5’’ long; sepals 
oblong; lip broad, 3-toothed at the apex; 
capsule oval or subglobose. 
In woods and thickets, Newfoundland to On- 
tario and Minnesota, south to Florida, Alabama 
and Missouri. Ascends to 4000 ft. in North Car- 
olina. July. 
11. LEPTORCHIS Thouars, Nouv. Bull. Soc. Plilom. 314. 1808. 
[Liparis L. C. Richard, Mem. Mus. Paris, 4:43. 1818.] . 
Low herbs, with solid bulbs, the base of the stem sheathed by several scales and 2 broad 
shining leaves. Flowers in terminal racemes. Sepals and petals nearly equal, linear, spread- 
ing, petals usually very narrow. Column elongated, incurved, thickened and margined 
above. Pollinia 2 in each sac of the anther smooth and waxy, the pairs slightly united, 
without stalk, threads or glands. Lip nearly flat, often bearing 2 tubercles above the base. 
[Greek, signifying a slender orchid. ] 
About 100 species, widely distributed in temperate and tropical regions; only the following 
known to occur in North America. 
Raceme many-flowered; lip as long as the petals. 1. L. lilitfolia, 
Raceme few-flowered; lip shorter than the petals. 2. L. Loeseltt. 
1. Leptorchis liliifolia (L.) Kuntze. Large Twayblade. (Fig. 1136.) 
Ophrys lilitfolia I. Sp. Pl. 946. 1753. 
Liparis liliifolia J. C. Rich. Lindl. Bot. Reg. 
pl. 882. 1825. 
Leptorchis liliifolia Kuntze, Rev. Gen. Pl. 671. 
1891. 
Scape 4/-10’ high, 5-10-striate. Leaves 
ovate or oval, 2’-5’ long, 1/-2'%4’ wide, ob- 
tuse, keeled below, the sheaths large and 
loose. Raceme sometimes 6’ long; flowers 
numerous, showy; sepals and petals some- 
what reflexed; petals very narrow or thread- 
like; lip erect, large, 5’’-6’’ long, about as 
long as the petals, wedge-obovate; column 
114’ long, incurved, dilated at the summit; 
pedicels slender, ascending or spreading, 
4’’-8” long; capsule somewhat club-shaped, 
about 6’ long, the pedicel thickened in fruit. 
In moist woods and thickets, Maine to Min- 
nesota, Georgia and Missouri. Ascends to 3000 
ft. in Virginia. May-July. 
